Compact tunnel inner contour design method based on full shoulder width of highway

Abstract

The invention relates to a compact tunnel inner contour design method based on the full shoulder width of a highway, and belongs to the technical field of underground engineering. According to the method, basic information of a road section where a tunnel is located is collected, and a road clearance of the road section where the tunnel is located and an additional clearance of a soil-containing shoulder width jointly form a tunnel building clearance; top positioning base points are established from the top edge and the vertex angle edge of the highway limit, and the top of the inner contour of the tunnel is drawn up according to a five-base-point + seven-control-point + three-arc-section method; bottom positioning base points are established from the bottom edge of the tunnel building limit, and the bottom of the inner contour of the tunnel is drawn up according to a five-base-point + seven-control-point + three-arc-section method; bottom positioning base points are established from the bottom edge of the tunnel building limit, and side wall parts on the two sides of the inner contour of the tunnel are drawn up according to a 2 base point + 6 control point + 4 straight line segment method; and the top, the bottom and the two side wall parts of the inner contour are combined to form a complete tunnel inner contour. The method not only can really meet the specification that the tunnel is suitable for being as wide as the roadbed, but also can avoid waste of tunnel section space, and has high economical efficiency, practicability and popularization and application significance.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering, and in particular relates to a compact tunnel inner profile design method based on the full shoulder width of a highway. Background Art

[0002] With the acceleration of the construction of a strong transportation country, the focus will be on strengthening the construction of modern comprehensive transportation infrastructure. As an important part of transportation infrastructure, tunnel projects are being built in increasing numbers. The inner contour section of the tunnel directly reflects the size of the available space in the tunnel, which is the basic guarantee for the normal use and safe operation of the tunnel. Its design is related to the rationality, safety and economy of the tunnel project. From the perspective of functional requirements, the inner contour of the tunnel should meet the space required for the tunnel construction limit, interior decoration, ancillary facilities, road surface, and ditch. The tunnel construction limit is the space required to ensure the passage of vehicles and personnel in the tunnel, and is the primary analysis factor in the design of the inner contour of the tunnel.

[0003] The width of the tunnel construction limit is composed of lane width + lateral width + residual width + maintenance road width, while the width of the roadbed section highway construction limit is composed of lane width + hard shoulder width + earth shoulder width. The width of the roadbed section highway construction limit is greater than the tunnel construction limit width.

[0004] There are two contradictions in the design of the construction limits and inner contours of highway tunnels: on the one hand, because the width of the roadbed limit is greater than the width of the tunnel limit, the road surface width often changes suddenly in the section where the roadbed and the tunnel meet, which directly affects the driving safety of this section. In response to this problem, the current industry standards "Technical Standards for Highway Engineering" (JTG B01-2014) and "Highway Tunnel Design Code" (JTG 3370.1-2018) stipulate that "medium and short tunnels should be the same width as the roadbed"; on the other hand, in order to make the tunnel structure more reasonably stressed, the inner contour section of the tunnel generally adopts a full-section arch, but if the construction limit width of the tunnel increases to the same width as the roadbed, its inner contour width will also increase accordingly, the rise-to-span ratio of the upper and lower arches of the tunnel will decrease, the structural stress will increase, and accordingly more support materials will be required, and the investment will increase.

[0005] In view of the above situation, most of the current highway tunnel designs do not consider the issue of "tunnels should be the same width as the roadbed"; although a small number of tunnel designs have considered "tunnels should be the same width as the roadbed", the tunnel construction limit width only includes the width of the driving lane and the hard shoulder, and the tunnel construction limit directly uses the highway limit of the roadbed section, does not include the width of the earth shoulder, and does not strictly implement the regulation that "tunnels should be the same width as the roadbed"; in recent years, some tunnels have strictly implemented the regulation that "tunnels should be the same width as the roadbed", and the tunnel construction limit width includes the width of the driving lane, the hard shoulder and the earth shoulder, and the corresponding inner contour adopts a full-section arch design. The tunnel has a large lateral span and a lot of space wasted in the inner contour, resulting in a surge in project investment.

[0006] Therefore, how to overcome the shortcomings of the existing technology is an urgent problem to be solved in the field of underground engineering technology. Summary of the invention

[0007] The purpose of the present invention is to solve the deficiencies of the prior art and provide a compact tunnel inner contour design method based on the full shoulder width of the highway. By collecting basic information of the road section where the tunnel is located, the highway limit of the road section where the tunnel is located and the additional limit of the width of the shoulder containing soil are formulated to jointly form the tunnel construction limit; a top positioning base point is established from the top edge and the top corner edge of the highway limit, and the top of the tunnel inner contour is formulated according to the "5 base points + 7 control points + 3 arc segments" method; a bottom positioning base point is established from the bottom edge of the tunnel construction limit, and the bottom of the tunnel inner contour is formulated according to the "5 base points + 7 control points + 3 arc segments" method; a bottom positioning base point is established from the bottom edge of the tunnel construction limit, and the side walls on both sides of the tunnel inner contour are formulated according to the "2 base points + 6 control points + 4 straight line segments" method; the top, bottom and side walls of the inner contour are merged to form a complete tunnel inner contour and construction is carried out.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A compact tunnel inner profile design method based on the full shoulder width of a highway comprises the following steps: Step (1) collects basic information about the road section where the tunnel is located, wherein the basic information includes the highway grade, design speed and roadbed components; wherein the roadbed components include the roadbed surface composition of the tunnel section and the width of each component. Step (2), formulate the highway limit of the section where the tunnel is located according to the provisions of Highway Engineering Technical Standard (JTG B01-2014); Step (3), based on the highway limit drawn up in step (2), additional construction limits of the width of the earth shoulder are added on both sides thereof, which together constitute the tunnel construction limit; Step (4), establish 5 base points for positioning the top of the inner contour of the tunnel from the top edge of the highway limit and the top corner edge, determine 7 control points for positioning the top of the inner contour according to the space requirements outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the top of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (5), establish 5 base points for positioning the bottom of the inner contour of the tunnel from the bottom edge of the highway limit, determine 7 control points for positioning the bottom of the inner contour according to the space requirement outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the bottom of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (6) establishes a base point for positioning the bottom of the tunnel inner contour from the bottom edge of the highway limit, determines two positioning control points on both sides of the inner contour according to the space requirements outside the tunnel construction limit, and uses two positioning control points at the top of the inner contour and two positioning control points at the bottom of the inner contour, a total of six control points, draws four straight line segments from the control points, and proposes the side walls of the tunnel inner contour according to the method of 2 base points + 6 control points + 4 straight line segments.

[0009] Step (7), based on the proposed inner contour top, the inner contour bottom and the side walls of the inner contour are combined to form a complete tunnel inner contour, and then construction is carried out according to the formed tunnel inner contour.

[0010] Furthermore, preferably, in step (1), the surface composition of the tunnel section roadbed includes the surface of the driving lane, the hard shoulder surfaces on the left and right sides, and the earth shoulder surfaces on the left and right sides; and the width of each component includes the width of the driving lane surface, the width of the hard shoulder surfaces on the left and right sides, and the width of the earth shoulder surfaces on the left and right sides.

[0011] Furthermore, preferably, in step (2), the highway limit is formulated according to the provisions of the construction limit of the "Technical Standard for Highway Engineering" (JTG B01-2014), and the bottom edge of the highway limit is located on the roadbed surface, and its width includes the width of the lane surface and the hard shoulder surface, but does not include the width of the earth shoulder surface.

[0012] Furthermore, preferably, in step (3), the tunnel construction limit is composed of the highway limit and the additional construction limits on the left and right sides, and there is one additional construction limit on each side, and both are right-angled triangles formed by the right-angled side in the horizontal direction X and the right-angled side in the vertical direction Y and the corresponding hypotenuse; wherein the right-angled side in the horizontal direction X is the base, and the right-angled side in the vertical direction Y is the height; The bottom edge is located on the surface of the earth shoulder and is the same width as the earth shoulder. The high side of the additional building limit is the same side as the straight side of the highway limit. The line segment between the outer endpoint of the bottom edge and the vertex of the high side is the hypotenuse.

[0013] Furthermore, preferably, in step (4), the specific positions of the five positioning base points are: the first base point at the top is located at the midpoint of the top edge of the highway limit, the second base point is located at the midpoint of the left top corner edge of the highway limit, the third base point is located at the midpoint of the right top corner edge of the highway limit, the fourth base point is located at the lower end point of the left top corner edge of the highway limit, and the fifth base point is located at the lower end point of the right top corner edge of the highway limit; In step (4), the space requirement outside the tunnel construction limit includes the space requirement at the top and outside the left and right top corners, which must meet the required angles for the layout of ventilation, lighting, signboards and monitoring facilities and equipment, the required height directly above the top edge of the highway limit and the required width outside the left and right top corners. At the same time, combined with the stress characteristics of the tunnel structure, the cross-sectional shape of the tunnel top is arched, and the inner contour is segmented according to the arc line; There are 7 top positioning control points in total, and the specific positions of each point are as follows: the first top positioning control point is located directly above the first base point at the top, the second control point is located on the left side of the second base point, the third control point is located on the right side of the third base point, the fourth control point is located on the left side of the fourth base point, the fifth control point is located on the right side of the fifth base point, the sixth control point is located at the lower left of the fourth base point, and the seventh control point is located at the lower right of the fifth base point; the minimum distance between the top positioning control point of the inner contour and the positioning base point in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the required space outside the top and left and right top corners, and the position of each positioning control point is specifically determined by the minimum distance; The three arc segments at the top of the inner contour are drawn through the top positioning control point, specifically: the first arc segment at the top is drawn with the first top positioning control point as the midpoint, and the second control point and the third control point as endpoints, the second arc segment at the top is drawn with the fourth top positioning control point as the midpoint, and the sixth control point and the second control point as endpoints, and the third arc segment at the top is drawn with the fifth top positioning control point as the midpoint, and the third control point and the seventh control point as endpoints; the first arc segment, the second arc segment and the third arc segment at the top constitute the top of the inner contour.

[0014] Further, preferably, in step (5), the specific positions of the five positioning base points are: the first base point of the bottom is located at the midpoint of the bottom edge of the highway limit, the second base point is located at the intersection of the bottom edge of the highway limit and the left straight side of the highway limit, the third base point is located at the intersection of the bottom edge of the highway limit and the right straight side of the highway limit, the fourth base point is located at the left end point of the bottom edge of the left additional limit, and the fifth base point is located at the right end point of the bottom edge of the right additional limit; In step (5), the space requirement outside the tunnel construction limit is the bottom space requirement, which needs to meet the space requirements for the road foundation, drainage trench, water supply pipe and cable layout. The required height directly below the bottom edge of the highway limit and the required width of the gap outside the end point of the limit bottom edge are required. At the same time, combined with the stress characteristics of the tunnel structure, the cross-sectional shape of the tunnel bottom is arched, and the inner contour is divided into sections according to the arc line. There are 7 bottom positioning control points in total, and the specific positions of each point are as follows: the first bottom positioning control point is located directly below the first base point of the bottom, the second control point is located to the lower right of the second base point, the third control point is located to the lower left of the third base point, the fourth control point is located to the lower left of the second base point, the fifth control point is located to the lower right of the third base point, the sixth control point is located to the left of the fourth base point, and the seventh control point is located to the right of the fifth base point; the minimum distance between the bottom positioning control point of the inner contour and the positioning base point in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the bottom required space, and the position of each positioning control point is specifically determined by the minimum distance; The three arc segments at the bottom of the inner contour are drawn through the bottom positioning control points, specifically: the first arc segment at the bottom is drawn with the first bottom positioning control point as the midpoint, and the second control point and the third control point as endpoints, the second arc segment at the bottom is drawn with the fourth control point as the midpoint, and the sixth control point and the second control point as endpoints, and the third arc segment at the bottom is drawn with the fifth control point as the midpoint, and the third control point and the seventh control point as endpoints; the first arc segment, the second arc segment and the third arc segment at the bottom constitute the bottom of the inner contour.

[0015] Further, preferably, in step (6), the two positioning base points are the fourth base point and the fifth base point of the bottom located at the limit; In step (6), the space requirement outside the tunnel construction limit is the space requirement of the side walls on both sides, which must meet the space requirements for interior decoration and signage. The angle of the side wall foot, i.e., the horizontal clearance outside the bottom of the additional limit bevel and the height requirement of the straight side wall, and combined with the stress characteristics of the tunnel structure, the side walls on both sides of the tunnel are straight walls, and the inner contour is drawn up in straight line segments; There are 6 positioning control points on both sides, and the specific positions of each point are: the left positioning control point is located at the upper left of the fourth base point at the bottom, and the right positioning control point is located at the upper right of the fifth base point at the bottom; the minimum distance between the positioning control points on both sides of the inner contour and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction is calculated by the required space of the left and right side walls, and the positions of the positioning control points on both sides are specifically determined by the minimum distance; in addition, the sixth and seventh control points at the top of the inner contour and the sixth and seventh control points at the bottom of the inner contour are used; The four straight line segments of the side walls on both sides are drawn through the positioning control points on both sides, specifically: the first straight line segment of the side wall is a line segment connecting the sixth positioning control point of the bottom and the left positioning control point of the inner contour, the second straight line segment of the side wall is a line segment connecting the seventh positioning control point of the bottom and the right positioning control point of the inner contour, the third straight line segment of the side wall is a line segment connecting the left positioning control point of the inner contour and the sixth positioning control point of the top, and the fourth straight line segment of the side wall is a line segment connecting the right positioning control point of the inner contour and the seventh positioning control point of the top; The first straight line segment of the side wall portion is connected to the third straight line segment of the side wall portion, the second straight line segment of the side wall portion is connected to the fourth straight line segment of the side wall portion, and the four straight line segments constitute the side wall portions on both sides of the inner contour.

[0016] Furthermore, preferably, in step (7), the complete inner contour of the tunnel is composed of a total of 6 arc segments and 4 straight line segments, namely, the first arc segment, the second arc segment, the third arc segment at the top of the inner contour, the first arc segment, the second arc segment, the third arc segment at the bottom of the inner contour, and the first straight line segment, the second straight line segment, the third straight line segment, and the fourth straight line segment at the side walls of the inner contour, thereby completing the design of the inner contour of the tunnel.

[0017] The present invention proposes a compact tunnel inner contour design method based on the full shoulder width of the highway. Under the premise of meeting the requirement that "the tunnel should be as wide as the roadbed", the construction limit within the earth shoulder range is embodied in the form of a right-angled triangle accessory limit from the actual function of the tunnel construction limit; from the analysis of the tunnel stress characteristics, straight edges are used instead of conventional arch edges for the inner contours of the side walls on both sides of the tunnel to reduce the span and stress of the tunnel structure; from the analysis of the actual space demand outside the tunnel construction limit, a compact tunnel inner contour space is proposed to reduce the waste of inner contour space and save engineering investment, which has strong economy, practicality and promotion and application significance.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention aims at the fact that the current highway tunnel design generally does not consider "tunnels should be the same width as the roadbed", some tunnel designs only consider the same width of the driving lane and the hard shoulder, and some tunnel designs consider the same width as the entire shoulder but with a large inner profile span, much space waste, and a surge in investment. A compact tunnel inner profile design method based on the full shoulder width of the highway is proposed. On the premise of meeting the requirement that "tunnels should be the same width as the roadbed", a compact tunnel inner profile space is formulated based on the actual function of the tunnel construction limit, the tunnel stress characteristics, and the actual space demand analysis outside the tunnel construction limit to reduce the waste of inner profile space. By comparing with the existing engineering technology, the tunnel inner profile formulated by the method of the present invention strictly meets the requirement that the tunnel is the same width as the roadbed, which is conducive to improving the traffic capacity of vehicles passing through the tunnel and ensuring driving safety; compared with the current individual tunnels that are strictly designed to be the same width as the roadbed, have a large inner profile section, and much space waste, the compact inner profile tunnel designed by the method of the present invention is expected to save more than 30% of engineering investment.

[0019] The invention provides a compact tunnel inner profile design method based on the full shoulder width of a highway, which has strong economy, practicability and promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is an overview of the tunnel construction limits, positioning points and inner contours; Figure 2 It is a section diagram of tunnel subgrade, building clearance, required space outside clearance, positioning points and inner contour; Figure 3 It is the composition diagram of the roadbed surface width of the tunnel section; Figure 4 It is the composition diagram of tunnel construction limits; Figure 5 Number each side of the tunnel construction limit; Figure 6 It is the required space diagram outside the top and top corner of the tunnel limit; Figure 7 The required space diagram for the bottom outside the tunnel limit; Figure 8 The required space diagram of the side walls on both sides outside the tunnel limit; Fig. 9 Prepare flow charts for top location and arc segment of tunnel profile; Fig.10 It is the position relationship diagram of the top positioning base point and the inner contour control point; Fig.11 Prepare flow charts for bottom location and arc segment of tunnel profile; Fig.12 It is the position relationship diagram of the bottom positioning base point and the inner contour control point; Fig.13 A large-scale drawing of the position relationship between the positioning base points on both sides of the bottom and the inner contour control points; Fig.14 It is the location map of the control points on the side walls on both sides of the tunnel contour; Fig.15 It is the straight line segment diagram of the side walls on both sides of the inner contour; Fig.16 This is a schematic diagram of the tunnel interior contour assembly.

[0022] In each figure: 1. The surface of the roadbed of the tunnel section; 11. Roadbed and carriageway surface; 12. Roadbed hard shoulder surface; 121, left side hard shoulder surface; 122, right side hard shoulder surface; 13. Subgrade soil shoulder surface; 131, left earth shoulder surface; 132, right earth shoulder surface; 2. Tunnel construction limits; 21. Highway limits; 211. Highway limit bottom edge; 212. Top edge of highway limit; 213. Left straight side of highway limit; 214, right straight side of highway limit; 215. Left top corner of highway limit; 216, right top corner of highway limit; 22. Additional limit on the left side; 221. Additional limit X-direction right-angle side on the left; 222, additional limiting hypotenuse on the left; 223. Additional limit Y-direction right angle edge on the left; 23. Additional limit on the right side; 231. Additional limit X-direction right angle side on the right side; 232, right additional limiting hypotenuse; 233. Additional limit Y-direction right angle side on the right side; 3. Space required outside the limit; 31. Top space required; 32. Space required outside the left top corner; 33. Space required outside the right top corner; 34. Bottom space required; 35. Space required for the left side wall; 36. Space required for the right side wall; 4. Tunnel contour positioning points; 4a. Position at the top base point of the limit; 4a1, the first base point at the top; 4a2, the second base point at the top; 4a3, the third base point at the top; 4a4, the fourth base point at the top; 4a5, the fifth base point at the top; 4b. Positioning control point at the top of the inner contour; 4b1. Position the first control point at the top; 4b2, locate the second control point at the top; 4b3, locate the third control point at the top; 4b4, locate the fourth control point at the top; 4b5, locate the fifth control point at the top; 4b6, locate the sixth control point at the top; 4b7, locate the seventh control point at the top; 4c. Position at the bottom base point of the limit; 4c1, the first base point of the bottom; 4c2, the second base point of the bottom; 4c3, the third base point of the bottom; 4c4, the fourth base point of the bottom; 4c5, the fifth base point from the bottom; 4d, inner contour bottom positioning control point; 4d1, locate the first control point at the bottom; 4d2, locate the second control point at the bottom; 4d3, locate the third control point at the bottom; 4d4, locate the fourth control point at the bottom; 4d5, locate the fifth control point at the bottom; 4d6, locate the sixth control point at the bottom; 4d7, bottom positioning seventh control point; 4e. Positioning control points on both sides of the inner contour; 4e1, positioning control point on the left side of the inner contour; 4e2, positioning control point on the right side of the inner contour; 5. Tunnel inner contour; 51. Top of inner contour; 511, the first arc segment at the top; 512, the second arc segment at the top; 513, the third arc segment at the top; 52. Bottom of inner contour; 521, the first arc segment at the bottom; 522, the second arc segment at the bottom; 523, the third arc segment at the bottom; 53. Side walls on both sides of the inner contour; 531, first straight line segment of side wall; 532, the second straight line segment of the side wall; 533, the third straight line segment of the side wall; 534. The fourth straight line segment of the side wall. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with embodiments.

[0024] Those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased. Example 1

[0025] A compact tunnel inner profile design method based on the full shoulder width of a highway comprises the following steps: Step (1) collects basic information about the road section where the tunnel is located, wherein the basic information includes the highway grade, design speed and roadbed components; wherein the roadbed components include the roadbed surface composition of the tunnel section and the width of each component. Step (2), formulate the highway limit of the section where the tunnel is located according to the provisions of Highway Engineering Technical Standard (JTG B01-2014); Step (3), based on the highway limit proposed in step (2), additional construction limits of the width of the earth shoulder are added on both sides thereof, which together constitute the tunnel construction limit; Step (4), establish 5 base points for positioning the top of the inner contour of the tunnel from the top edge of the highway limit and the top corner edge, determine 7 control points for positioning the top of the inner contour according to the space requirements outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the top of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (5), establish 5 base points for positioning the bottom of the inner contour of the tunnel from the bottom edge of the highway limit, determine 7 control points for positioning the bottom of the inner contour according to the space requirement outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the bottom of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (6) establishes a base point for positioning the bottom of the tunnel inner contour from the bottom edge of the highway limit, determines two positioning control points on both sides of the inner contour according to the space requirements outside the tunnel construction limit, and uses two positioning control points at the top of the inner contour and two positioning control points at the bottom of the inner contour, a total of six control points, draws four straight line segments from the control points, and proposes the side walls of the tunnel inner contour according to the method of 2 base points + 6 control points + 4 straight line segments.

[0026] Step (7), based on the proposed inner contour top, the inner contour bottom and the side walls of the inner contour are combined to form a complete tunnel inner contour, and then construction is carried out according to the formed tunnel inner contour. Example 2

[0027] A compact tunnel inner profile design method based on the full shoulder width of a highway comprises the following steps: Step (1) collects basic information about the road section where the tunnel is located, wherein the basic information includes the highway grade, design speed and roadbed components; wherein the roadbed components include the roadbed surface composition of the tunnel section and the width of each component. Step (2), formulate the highway limit of the section where the tunnel is located according to the provisions of Highway Engineering Technical Standard (JTG B01-2014); Step (3), based on the highway limit drawn up in step (2), additional construction limits of the width of the earth shoulder are added on both sides thereof, which together constitute the tunnel construction limit; Step (4), establish 5 base points for positioning the top of the inner contour of the tunnel from the top edge of the highway limit and the top corner edge, determine 7 control points for positioning the top of the inner contour according to the space requirements outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the top of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (5), establish 5 base points for positioning the bottom of the inner contour of the tunnel from the bottom edge of the highway limit, determine 7 control points for positioning the bottom of the inner contour according to the space requirement outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the bottom of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (6) establishes a base point for positioning the bottom of the tunnel inner contour from the bottom edge of the highway limit, determines two positioning control points on both sides of the inner contour according to the space requirements outside the tunnel construction limit, and uses two positioning control points at the top of the inner contour and two positioning control points at the bottom of the inner contour, a total of six control points, draws four straight line segments from the control points, and proposes the side walls of the tunnel inner contour according to the method of 2 base points + 6 control points + 4 straight line segments.

[0028] Step (7), based on the proposed inner contour top, the inner contour bottom and the side walls of the inner contour are combined to form a complete tunnel inner contour, and then construction is carried out according to the formed tunnel inner contour.

[0029] In step (1), the roadbed surface of the tunnel section includes the surface of the driving lane, the hard shoulder surfaces on the left and right sides, and the earth shoulder surfaces on the left and right sides; the width of each component includes the width of the driving lane surface, the width of the hard shoulder surfaces on the left and right sides, and the width of the earth shoulder surfaces on the left and right sides.

[0030] In step (2), the highway limit is formulated according to the construction limit provisions of the Highway Engineering Technical Standard (JTG B01-2014). The bottom edge of the highway limit is located on the roadbed surface, and its width includes the width of the lane surface and the hard shoulder surface, but does not include the width of the earth shoulder surface.

[0031] In step (3), the tunnel construction limit is composed of the highway limit and the additional construction limits on the left and right sides. There is one additional construction limit on each side, and both are right triangles formed by the right angle side in the horizontal direction X and the right angle side in the vertical direction Y and the corresponding hypotenuse; wherein the right angle side in the horizontal direction X is the base, and the right angle side in the vertical direction Y is the height; The bottom edge is located on the surface of the earth shoulder and is the same width as the earth shoulder. The high side of the additional building limit is the same side as the straight side of the highway limit. The line segment between the outer endpoint of the bottom edge and the vertex of the high side is the hypotenuse.

[0032] In step (4), the specific positions of the five positioning base points are: the first base point at the top is located at the midpoint of the top edge of the highway limit, the second base point is located at the midpoint of the left top corner edge of the highway limit, the third base point is located at the midpoint of the right top corner edge of the highway limit, the fourth base point is located at the lower end point of the left top corner edge of the highway limit, and the fifth base point is located at the lower end point of the right top corner edge of the highway limit; In step (4), the space requirement outside the tunnel construction limit includes the space requirement at the top and outside the left and right top corners, which must meet the required angles for the layout of ventilation, lighting, signboards and monitoring facilities and equipment, the required height directly above the top edge of the highway limit and the required width outside the left and right top corners. At the same time, combined with the stress characteristics of the tunnel structure, the cross-sectional shape of the tunnel top is arched, and the inner contour is segmented according to the arc line; There are 7 top positioning control points in total, and the specific positions of each point are as follows: the first top positioning control point is located directly above the first base point at the top, the second control point is located on the left side of the second base point, the third control point is located on the right side of the third base point, the fourth control point is located on the left side of the fourth base point, the fifth control point is located on the right side of the fifth base point, the sixth control point is located at the lower left of the fourth base point, and the seventh control point is located at the lower right of the fifth base point; the minimum distance between the top positioning control point of the inner contour and the positioning base point in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the required space outside the top and left and right top corners, and the position of each positioning control point is specifically determined by the minimum distance; The three arc segments at the top of the inner contour are drawn through the top positioning control point, specifically: the first arc segment at the top is drawn with the first top positioning control point as the midpoint, and the second control point and the third control point as endpoints, the second arc segment at the top is drawn with the fourth top positioning control point as the midpoint, and the sixth control point and the second control point as endpoints, and the third arc segment at the top is drawn with the fifth top positioning control point as the midpoint, and the third control point and the seventh control point as endpoints; the first arc segment, the second arc segment and the third arc segment at the top constitute the top of the inner contour.

[0033] In step (5), the specific positions of the five positioning base points are: the first base point of the bottom is located at the midpoint of the bottom edge of the highway limit, the second base point is located at the intersection of the bottom edge of the highway limit and the left straight side of the highway limit, the third base point is located at the intersection of the bottom edge of the highway limit and the right straight side of the highway limit, the fourth base point is located at the left end point of the bottom edge of the left additional limit, and the fifth base point is located at the right end point of the bottom edge of the right additional limit; In step (5), the space requirement outside the tunnel construction limit is the bottom space requirement, which needs to meet the space requirements for the road foundation, drainage trench, water supply pipe and cable layout. The required height directly below the bottom edge of the highway limit and the required width of the gap outside the end point of the limit bottom edge are required. At the same time, combined with the stress characteristics of the tunnel structure, the cross-sectional shape of the tunnel bottom is arched, and the inner contour is divided into sections according to the arc line. There are 7 bottom positioning control points in total, and the specific positions of each point are as follows: the first bottom positioning control point is located directly below the first base point of the bottom, the second control point is located to the lower right of the second base point, the third control point is located to the lower left of the third base point, the fourth control point is located to the lower left of the second base point, the fifth control point is located to the lower right of the third base point, the sixth control point is located to the left of the fourth base point, and the seventh control point is located to the right of the fifth base point; the minimum distance between the bottom positioning control point of the inner contour and the positioning base point in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the bottom required space, and the position of each positioning control point is specifically determined by the minimum distance; The three arc segments at the bottom of the inner contour are drawn through the bottom positioning control points, specifically: the first arc segment at the bottom is drawn with the first bottom positioning control point as the midpoint, and the second control point and the third control point as endpoints, the second arc segment at the bottom is drawn with the fourth control point as the midpoint, and the sixth control point and the second control point as endpoints, and the third arc segment at the bottom is drawn with the fifth control point as the midpoint, and the third control point and the seventh control point as endpoints; the first arc segment, the second arc segment and the third arc segment at the bottom constitute the bottom of the inner contour.

[0034] In step (6), the two positioning base points are the fourth base point and the fifth base point at the bottom located at the limit; In step (6), the space requirement outside the tunnel construction limit is the space requirement of the side walls on both sides, which must meet the space requirements for interior decoration and signage. The angle of the side wall foot, i.e., the horizontal clearance outside the bottom of the additional limit bevel and the height requirement of the straight side wall, and combined with the stress characteristics of the tunnel structure, the side walls on both sides of the tunnel are straight walls, and the inner contour is drawn up in straight line segments; There are 6 positioning control points on both sides, and the specific positions of each point are: the left positioning control point is located at the upper left of the fourth base point at the bottom, and the right positioning control point is located at the upper right of the fifth base point at the bottom; the minimum distance between the positioning control points on both sides of the inner contour and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction is calculated by the required space of the left and right side walls, and the positions of the positioning control points on both sides are specifically determined by the minimum distance; in addition, the sixth and seventh control points at the top of the inner contour and the sixth and seventh control points at the bottom of the inner contour are used; The four straight line segments of the side walls on both sides are drawn through the positioning control points on both sides, specifically: the first straight line segment of the side wall is a line segment connecting the sixth positioning control point of the bottom and the left positioning control point of the inner contour, the second straight line segment of the side wall is a line segment connecting the seventh positioning control point of the bottom and the right positioning control point of the inner contour, the third straight line segment of the side wall is a line segment connecting the left positioning control point of the inner contour and the sixth positioning control point of the top, and the fourth straight line segment of the side wall is a line segment connecting the right positioning control point of the inner contour and the seventh positioning control point of the top; The first straight line segment of the side wall portion is connected to the third straight line segment of the side wall portion, the second straight line segment of the side wall portion is connected to the fourth straight line segment of the side wall portion, and the four straight line segments constitute the side wall portions on both sides of the inner contour.

[0035] In step (7), the complete tunnel inner contour is composed of 6 arc segments and 4 straight line segments, namely, the first arc segment, the second arc segment, the third arc segment at the top of the inner contour, the first arc segment, the second arc segment, the third arc segment at the bottom of the inner contour, and the first straight line segment, the second straight line segment, the third straight line segment, and the fourth straight line segment at the side walls of the inner contour on both sides, thereby completing the tunnel inner contour design.

[0036] Application Examples

[0037] like Figure 1 , Figure 2As shown, a highway tunnel in a certain embodiment adopts a scheme that the width of the tunnel section roadbed 1 is completely contained in the tunnel. At the same time, in order to take into account the economy, the tunnel section needs to be planned to be as compact as possible. A compact tunnel inner contour design method based on the full shoulder width of the highway is adopted in the present invention, the building limit 2 is planned, the required space outside the tunnel limit 3 is analyzed, the tunnel inner contour positioning points 4 are established, and the tunnel inner contour 5 is drawn. The specific implementation is as follows: (1) Collect basic information about the section where the tunnel is located, including highway grade, design speed, and roadbed components.

[0038] The road section where the tunnel is located is a two-lane expressway with a design speed of 80 km / h. The roadbed surface 1 of the tunnel section consists of a roadbed carriageway surface 11, a roadbed hard shoulder surface 12, and a roadbed earth shoulder surface 13, wherein the roadbed hard shoulder surface 12 includes a left hard shoulder surface 121 and a right hard shoulder surface 122, and the roadbed earth shoulder surface 13 includes a left earth shoulder surface 131 and a right earth shoulder surface 132; The roadbed surface 1 of the tunnel section is 12.75m wide, and the widths of its components are: the roadbed carriageway surface 11 is 7.5m wide, the roadbed hard shoulder surface 12 is 3.75m wide, the left hard shoulder surface 121 is 0.75m wide, the right hard shoulder surface 122 is 3.00m wide, the roadbed earth shoulder surface 13 is 1.5m wide, the left earth shoulder surface 131 is 0.75m wide, and the right earth shoulder surface 132 is 0.75m wide.

[0039] (2) The highway limits of the section where the tunnel is located shall be determined in accordance with the provisions of the Highway Engineering Technical Standard (JTG B01).

[0040] Highway limit 21 is formulated in accordance with the provisions of the "Construction Limit" section of the "Technical Standards for Highway Engineering" (JTG B01). The limit bottom edge 211 of highway limit 21 coincides with the roadbed surface 1 of the tunnel section. The width of the limit bottom edge 211 is 11.25m, which is the sum of the widths of the roadbed carriageway surface 11 and the roadbed hard shoulder 12, excluding the width of the 1.5m roadbed earth shoulder surface 13.

[0041] (3) Based on the highway limit proposed in step (2), additional construction limits including the width of the earth shoulder are added on both sides to form the tunnel construction limit.

[0042] The additional building limit includes a left additional limit 22 and a right additional limit 23, both of which are right-angled triangles; The left additional limit X-direction right-angled side 221 coincides with the left earth shoulder surface 131 and has the same width. The left additional limit oblique side 222 is a line connecting the left end point of the left additional limit X-direction right-angled side 221 and the upper end point of the left straight side 213 of the highway limit. The left additional limit Y-direction right-angled side 223 and the left straight side 213 of the highway limit are the same line segment. The right side additional limit X-direction right angle side 231 coincides with the right side earth shoulder surface 132 and has the same width, the right side additional limit oblique side 232 is a line connecting the right end point of the right side additional limit X-direction right angle side 231 and the upper end point of the right straight side 214 of the highway limit, and the right side additional limit Y-direction right angle side 233 and the right straight side 214 of the highway limit are the same line segment; The tunnel construction limit 2 is composed of a highway limit 21 and a left additional limit 22 and a right additional limit 23.

[0043] (4) Establish five base points for positioning the top of the tunnel inner contour from the top edge of the highway limit and the top corner edge. Determine seven control points for positioning the top of the inner contour based on the space requirements outside the tunnel construction limit. Draw three arcs from the control points. Use the "5 base points + 7 control points + 3 arcs" method to determine the top of the tunnel inner contour.

[0044] There are 5 top base points 4a located at the limit in the tunnel inner contour positioning points 4, and the specific positions of the points are as follows: the top first base point 4a1 is located at the midpoint of the top edge 212 of the highway limit, the top second base point 4a2 is located at the midpoint of the left top corner edge 215 of the highway limit, the top third base point 4a3 is located at the midpoint of the right top corner edge 216 of the highway limit, the top fourth base point 4a4 is located at the lower end point of the left top corner edge 215 of the highway limit, and the top fifth base point 4a5 is located at the lower end point of the right top corner edge 216 of the highway limit; The top required space 31, the left top corner outer required space 32, and the right top corner outer required space 33 of the outer required space 3 outside the tunnel construction limit 2 are analyzed: the top required space 31, the left top corner outer required space 32, and the right top corner outer required space 33 should be able to meet the space requirements for the layout of ventilation, lighting, signboards, and monitoring facilities and equipment. The minimum required height directly above the top edge 212 of the highway limit gradually decreases from 1.80m in the middle to 0.15m on both sides. The left top corner edge 215 of the highway limit and the right top corner edge 216 of the highway limit need to have a width of 0.15cm. At the same time, combined with the comprehensive analysis of the tunnel structure stress, the cross-sectional shape of the top 51 of the inner contour of the tunnel inner contour 5 is arched, and it is planned to be segmented by circular arc lines; The inner contour top 51 is drawn up by the inner contour top positioning control points 4b. There are 7 inner contour top positioning control points 4b in total. The specific positions of the points are as follows: the top positioning first control point 4b1 is located directly above the top first base point 4a1, the top positioning second control point 4b2 is located on the left side of the top second base point 4a2, the top positioning third control point 4b3 is located on the right side of the top third base point 4a3, the top positioning fourth control point 4b4 is located on the left side of the top fourth base point 4a4, the top positioning fifth control point 4b5 is located on the right side of the top fifth base point 4a5, the top positioning sixth control point 4b6 is located at the lower left of the top fourth base point 4a4, and the top positioning seventh control point 4b7 is located at the lower right of the top fifth base point 4a5; The minimum distances in the X-axis direction and the Y-axis direction between the inner contour top positioning control point 4b and the top base point 4a positioned at the limit are specifically calculated through the top required space 31, the left top corner outer required space 32, and the right top corner outer required space 33, as shown in Table 1, and the position of each control point is determined by the minimum distance in Table 1; Table 1 Distance between top base point and control point

[0045] The inner contour top 51 is composed of three arc segments drawn by the inner contour top positioning control point 4b, and the specific drawing method of each arc segment is as follows: the top first arc segment 511 is drawn with the top positioning first control point 4b1 as the midpoint, the top positioning second control point 4b2 and the top positioning third control point 4b3 as endpoints, the top second arc segment 512 is drawn with the top positioning fourth control point 4b4 as the midpoint, the top positioning sixth control point 4b6 and the top positioning second control point 4b2 as endpoints, and the top third arc segment 513 is drawn with the top positioning fifth control point 4b5 as the midpoint, the top positioning third control point 4b3 and the top positioning seventh control point 4b7 as endpoints; the top first arc segment 511, the top second arc segment 512 and the top third arc segment 513 constitute the inner contour top 51.

[0046] (5) Establish five base points for positioning the bottom of the inner contour of the tunnel from the bottom edge of the highway limit. Determine seven control points for positioning the bottom of the inner contour based on the space requirements outside the tunnel construction limit. Draw three arc segments from the control points. Draw the bottom of the inner contour of the tunnel using the "5 base points + 7 control points + 3 arc segments" method.

[0047] There are 5 bottom base points 4c located at the limit in the tunnel inner contour positioning points 4, and the specific positions of the points are as follows: the first bottom base point 4c1 is located at the midpoint of the bottom edge 211 of the highway limit, the second bottom base point 4c2 is located at the intersection of the bottom edge 211 of the highway limit and the left straight side 213 of the highway limit, the third bottom base point 4c3 is located at the intersection of the bottom edge 211 of the highway limit and the right straight side 214 of the highway limit, the fourth bottom base point 4c4 is located at the left end point of the left additional limit bottom edge 221, and the fifth bottom base point 4c5 is located at the right end point of the right additional limit bottom edge 231; The bottom required space 34 of the outer limit required space 3 outside the tunnel construction limit 2 is analyzed: the bottom required space 34 should be able to meet the space requirements for the road foundation, drainage trench, water supply pipe and cable layout. The minimum required height directly below the highway limit bottom edge 211 gradually decreases from 1.75m in the middle to 0m on both sides. There needs to be a 0.05cm wide gap outside the left end point of the left additional limit bottom edge 221 and the right end point of the right additional limit bottom edge 231. At the same time, combined with the comprehensive analysis of the tunnel structure stress, the cross-sectional shape of the inner contour bottom 52 of the tunnel inner contour 5 adopts an arch, and it is planned to adopt arc line segmentation; The inner contour bottom 52 is drawn up by the inner contour bottom positioning control points 4d. There are 7 inner contour bottom positioning control points 4d in total. The specific positions of the points are as follows: the first bottom positioning control point 4d1 is located directly below the first bottom base point 4c1, the second bottom positioning control point 4d2 is located to the lower right of the second bottom base point 4c2, the third bottom positioning control point 4d3 is located to the lower left of the third bottom base point 4c3, the fourth bottom positioning control point 4d4 is located to the lower left of the second bottom base point 4c2, the fifth bottom positioning control point 4d5 is located to the lower right of the third bottom base point 4c3, the sixth bottom positioning control point 4d6 is located to the left of the fourth bottom base point 4c4, and the seventh bottom positioning control point 4d7 is located to the right of the fifth bottom base point 4c5. The minimum distances in the X-axis direction and the Y-axis direction between the inner contour bottom positioning control point 4d and the bottom base point 4c positioned at the limit are specifically calculated through the bottom required space 34, as shown in Table 2, and the position of each control point is determined by the minimum distance in Table 2; Table 2 Distance between bottom base point and control point

[0048] The inner contour bottom 52 is composed of three arc segments drawn by the inner contour bottom positioning control point 4d, and the specific drawing method of each arc segment is as follows: the bottom first arc segment 521 is drawn with the bottom first positioning control point 4d1 as the midpoint, the bottom second positioning control point 4d2 and the bottom third positioning control point 4d3 as endpoints, the bottom second arc segment 522 is drawn with the bottom fourth positioning control point 4d4 as the midpoint, the bottom sixth positioning control point 4d6 and the bottom second positioning control point 4d2 as endpoints, and the bottom third arc segment 523 is drawn with the bottom fifth positioning control point 4d5 as the midpoint, the bottom third positioning control point 4d3 and the bottom seventh positioning control point 4d7 as endpoints; the bottom first arc segment 521, the bottom second arc segment 522 and the bottom third arc segment 523 constitute the inner contour bottom 52.

[0049] (6) Establish the bottom positioning base point of the tunnel inner contour from the bottom edge of the highway limit. Determine two positioning control points on both sides of the inner contour according to the space requirements outside the tunnel construction limit. Use two positioning control points at the top of the inner contour and two positioning control points at the bottom of the inner contour, a total of six control points. Draw four straight line segments from the control points. Draw the side walls of the tunnel inner contour on both sides according to the "2 base points + 6 control points + 4 straight line segments" method.

[0050] The base points for positioning on both sides of the tunnel are the fourth base point 4c4 and the fifth base point 4c5 of the bottom located at the limit in the tunnel inner contour positioning points 4; The required space 35 of the left side wall and the required space 36 of the right side wall of the outer limit required space 3 outside the tunnel construction limit 2 are analyzed: the required space 35 of the left side wall and the required space 36 of the right side wall should be able to meet the space requirements for interior decoration and indication signs. The minimum horizontal clearance of the foot of the side walls on both sides, i.e., the bottom outer side of the left additional limit bevel 222 and the bottom outer side of the right additional limit bevel 232 is 0.05m, and the minimum height of the straight side wall is 0.20m. At the same time, combined with the comprehensive analysis of the tunnel structure stress, the side walls 53 on both sides of the inner contour of the tunnel inner contour 5 are straight walls, and it is planned to adopt 4 straight line segments; The side wall portions 53 on both sides of the inner contour are defined by the positioning control points 4e on both sides of the inner contour, two positioning control points 4b on the top of the inner contour, and two positioning control points 4d on the bottom of the inner contour; the specific positions of the positioning control points 4e on both sides of the inner contour are: the positioning control point 4e1 on the left side of the inner contour is located at the upper left of the fourth base point 4c4 of the bottom, and the positioning control point 4e2 on the right side of the inner contour is located at the upper right of the fifth base point 4c5 of the bottom; the minimum distances in the X-axis direction and the Y-axis direction between the positioning control points 4e on both sides of the inner contour and the bottom base point 4c positioned at the limit are specifically calculated by the required space 35 of the left side wall portion and the required space 36 of the right side wall portion, as shown in Table 3, and the position of each control point is determined by the minimum distance in Table 3; Table 3 Distance between the bottom base point and the positioning control points on both sides

[0051] The two inner contour top positioning control points 4b used are the sixth top positioning control point 4b6 and the seventh top positioning control point 4b7, and the two inner contour bottom positioning control points 4d are the sixth bottom positioning control point 4d6 and the seventh bottom positioning control point 4d7; The side walls 53 on both sides of the inner contour are drawn with four straight line segments through six positioning control points 4d, and the specific drawing method of each straight line segment is as follows: the first straight line segment 531 of the side wall is a line segment connecting the sixth bottom positioning control point 4d6 and the left side positioning control point 4e1 of the inner contour, the second straight line segment 532 of the side wall is a line segment connecting the seventh bottom positioning control point 4d7 and the right side positioning control point 4e2 of the inner contour, the third straight line segment 533 of the side wall is a line segment connecting the left side positioning control point 4e1 of the inner contour and the sixth top positioning control point 4b6, and the fourth straight line segment 534 of the side wall is a line segment connecting the right side positioning control point 4e2 of the inner contour and the seventh top positioning control point 4b7; the first straight line segment 531 of the side wall is connected to the third straight line segment 533 of the side wall, the second straight line segment 532 of the side wall is connected to the fourth straight line segment 534 of the side wall, and the four straight line segments constitute the side walls 53 on both sides of the inner contour.

[0052] (7) The top of the inner contour, the bottom of the inner contour and the side walls of the inner contour prepared in the previous steps are combined to form a complete inner contour of the tunnel.

[0053] The top first arc segment 511, the top second arc segment 512, the top third arc segment 513 of the inner contour top 51, the bottom first arc segment 521, the bottom second arc segment 522, the bottom third arc segment 523 of the inner contour bottom 52, the side wall portion first straight line segment 531, the side wall portion second straight line segment 532, the side wall portion third straight line segment 533, and the side wall portion fourth straight line segment 534 of the side wall portion 53 on both sides of the inner contour, a total of 6 arc segments and 4 straight line segments together constitute the tunnel inner contour 5.

[0054] The above method is used to complete the design of the inner contour of the tunnel in this embodiment, and then construction is carried out according to the constructed inner contour of the tunnel.

[0055] By comparing the present invention with the existing engineering technology, the inner contour of the tunnel designed according to the method of the present invention strictly meets the requirement that the tunnel and the roadbed are the same width, which is beneficial to improving the traffic capacity of vehicles passing through the tunnel and ensuring driving safety; compared with the current individual tunnels that are strictly designed to be the same width as the roadbed, have a large inner contour section, and waste a lot of space, the compact inner contour tunnel designed according to the method of the present invention is expected to save more than 30% of the project investment.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A compact tunnel inner profile design method based on the full shoulder width of a highway, characterized in that: The steps include: Step (1) collects basic information about the road section where the tunnel is located, wherein the basic information includes the highway grade, design speed and roadbed components; wherein the roadbed components include the roadbed surface composition of the tunnel section and the width of each component. Step (2), formulate the highway limit of the section where the tunnel is located according to the provisions of Highway Engineering Technical Standard (JTG B01-2014); Step (3), based on the highway limit drawn up in step (2), additional construction limits of the width of the earth shoulder are added on both sides thereof, which together constitute the tunnel construction limit; Step (4), establish 5 base points for positioning the top of the inner contour of the tunnel from the top edge of the highway limit and the top corner edge, determine 7 control points for positioning the top of the inner contour according to the space requirements outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the top of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (5), establish 5 base points for positioning the bottom of the inner contour of the tunnel from the bottom edge of the highway limit, determine 7 control points for positioning the bottom of the inner contour according to the space requirement outside the tunnel construction limit, draw 3 arc lines from the control points, and formulate the bottom of the inner contour of the tunnel according to the method of 5 base points + 7 control points + 3 arc segments; Step (6), establishing a bottom positioning base point of the tunnel inner contour from the bottom edge of the highway limit, determining two positioning control points on both sides of the inner contour according to the space requirement outside the tunnel construction limit, and using two positioning control points at the top of the inner contour and two positioning control points at the bottom of the inner contour, a total of six control points, drawing four straight line segments from the control points, and drafting the side walls on both sides of the tunnel inner contour according to the method of 2 base points + 6 control points + 4 straight line segments; Step (7), based on the proposed inner contour top, the inner contour bottom and the side walls of the inner contour are combined to form a complete tunnel inner contour, and then construction is carried out according to the formed tunnel inner contour.

2. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1 is characterized in that: In step (1), the roadbed surface of the tunnel section includes the surface of the driving lane, the hard shoulder surfaces on the left and right sides, and the earth shoulder surfaces on the left and right sides; the width of each component includes the width of the driving lane surface, the width of the hard shoulder surfaces on the left and right sides, and the width of the earth shoulder surfaces on the left and right sides.

3. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1 is characterized in that: In step (2), the highway limit is formulated according to the construction limit provisions of the Highway Engineering Technical Standard (JTG B01-2014). The bottom edge of the highway limit is located on the roadbed surface, and its width includes the width of the lane surface and the hard shoulder surface, but does not include the width of the earth shoulder surface.

4. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1 is characterized in that: In step (3), the tunnel construction limit is composed of the highway limit and the additional construction limits on the left and right sides. There is one additional construction limit on each side, and both are right triangles formed by the right angle side in the horizontal direction X and the right angle side in the vertical direction Y and the corresponding hypotenuse; wherein the right angle side in the horizontal direction X is the base, and the right angle side in the vertical direction Y is the height; The bottom edge is located on the surface of the earth shoulder and is the same width as the earth shoulder. The high side of the additional building limit is the same side as the straight side of the highway limit. The line segment between the outer endpoint of the bottom edge and the vertex of the high side is the hypotenuse.

5. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1, characterized in that: In step (4), the specific positions of the five positioning base points are: the first base point at the top is located at the midpoint of the top edge of the highway limit, the second base point is located at the midpoint of the left top corner edge of the highway limit, the third base point is located at the midpoint of the right top corner edge of the highway limit, the fourth base point is located at the lower end point of the left top corner edge of the highway limit, and the fifth base point is located at the lower end point of the right top corner edge of the highway limit; In step (4), the space requirement outside the tunnel construction limit includes the space requirement at the top and outside the left and right top corners, which must meet the required angles for the layout of ventilation, lighting, signboards and monitoring facilities and equipment, the required height directly above the top edge of the highway limit and the required width outside the left and right top corners. At the same time, combined with the stress characteristics of the tunnel structure, the cross-sectional shape of the tunnel top is arched, and the inner contour is segmented according to the arc line; There are 7 top positioning control points in total, and the specific positions of each point are as follows: the first top positioning control point is located directly above the first base point at the top, the second control point is located on the left side of the second base point, the third control point is located on the right side of the third base point, the fourth control point is located on the left side of the fourth base point, the fifth control point is located on the right side of the fifth base point, the sixth control point is located at the lower left of the fourth base point, and the seventh control point is located at the lower right of the fifth base point; the minimum distance between the top positioning control point of the inner contour and the positioning base point in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the required space outside the top and left and right top corners, and the position of each positioning control point is specifically determined by the minimum distance; The top three arc segments of the inner contour are drawn through the top positioning control point, specifically: the top first arc segment is drawn with the top positioning first control point as the midpoint, and the second control point and the third control point as the endpoints; the top second arc segment is drawn with the top positioning fourth control point as the midpoint, and the sixth control point and the second control point as the endpoints; the top third arc segment is drawn with the top positioning fifth control point as the midpoint, and the third control point and the seventh control point as the endpoints; The first arc segment, the second arc segment and the third arc segment at the top constitute the top of the inner contour.

6. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1, characterized in that: In step (5), the specific positions of the five positioning base points are: the first base point of the bottom is located at the midpoint of the bottom edge of the highway limit, the second base point is located at the intersection of the bottom edge of the highway limit and the left straight side of the highway limit, the third base point is located at the intersection of the bottom edge of the highway limit and the right straight side of the highway limit, the fourth base point is located at the left end point of the bottom edge of the left additional limit, and the fifth base point is located at the right end point of the bottom edge of the right additional limit; In step (5), the space requirement outside the tunnel construction limit is the bottom space requirement, which needs to meet the space requirements for the road foundation, drainage trench, water supply pipe and cable layout. The required height directly below the bottom edge of the highway limit and the required width of the gap outside the end point of the limit bottom edge are required. At the same time, combined with the stress characteristics of the tunnel structure, the cross-sectional shape of the tunnel bottom is arched, and the inner contour is divided into sections according to the arc line. There are 7 bottom positioning control points in total, and the specific positions of each point are as follows: the first bottom positioning control point is located directly below the first base point of the bottom, the second control point is located to the lower right of the second base point, the third control point is located to the lower left of the third base point, the fourth control point is located to the lower left of the second base point, the fifth control point is located to the lower right of the third base point, the sixth control point is located to the left of the fourth base point, and the seventh control point is located to the right of the fifth base point; the minimum distance between the bottom positioning control point of the inner contour and the positioning base point in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the bottom required space, and the position of each positioning control point is specifically determined by the minimum distance; The three arc segments at the bottom of the inner contour are drawn through the bottom positioning control point, specifically: the first arc segment at the bottom is drawn with the first bottom positioning control point as the midpoint, and the second and third control points as endpoints; the second arc segment at the bottom is drawn with the fourth control point as the midpoint, and the sixth and second control points as endpoints; the third arc segment at the bottom is drawn with the fifth control point as the midpoint, and the third and seventh control points as endpoints; The first arc segment, the second arc segment and the third arc segment of the bottom constitute the inner contour bottom.

7. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1, characterized in that: In step (6), the two positioning base points are the fourth base point and the fifth base point at the bottom located at the limit; In step (6), the space requirement outside the tunnel construction limit is the space requirement of the side walls on both sides, which must meet the space requirements for interior decoration and signage. The angle of the side wall foot, i.e., the horizontal clearance outside the bottom of the additional limit bevel and the height requirement of the straight side wall, and combined with the stress characteristics of the tunnel structure, the side walls on both sides of the tunnel are straight walls, and the inner contour is drawn up in straight line segments; There are 6 positioning control points on both sides, and the specific positions of each point are: the left positioning control point is located at the upper left of the fourth base point at the bottom, and the right positioning control point is located at the upper right of the fifth base point at the bottom; the minimum distance between the positioning control points on both sides of the inner contour and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction is calculated by the required space of the left and right side walls, and the positions of the positioning control points on both sides are specifically determined by the minimum distance; in addition, the sixth and seventh control points at the top of the inner contour and the sixth and seventh control points at the bottom of the inner contour are used; The four straight line segments of the side walls on both sides are drawn through the positioning control points on both sides, specifically: the first straight line segment of the side wall is a line segment connecting the sixth positioning control point of the bottom and the left positioning control point of the inner contour, the second straight line segment of the side wall is a line segment connecting the seventh positioning control point of the bottom and the right positioning control point of the inner contour, the third straight line segment of the side wall is a line segment connecting the left positioning control point of the inner contour and the sixth positioning control point of the top, and the fourth straight line segment of the side wall is a line segment connecting the right positioning control point of the inner contour and the seventh positioning control point of the top; The first straight line segment of the side wall portion is connected to the third straight line segment of the side wall portion, the second straight line segment of the side wall portion is connected to the fourth straight line segment of the side wall portion, and the four straight line segments constitute the side wall portions on both sides of the inner contour.

8. The compact tunnel inner profile design method based on the full shoulder width of the highway according to claim 1, characterized in that: In step (7), the complete tunnel inner contour is composed of 6 arc segments and 4 straight line segments, namely, the first arc segment, the second arc segment, the third arc segment at the top of the inner contour, the first arc segment, the second arc segment, the third arc segment at the bottom of the inner contour, and the first straight line segment, the second straight line segment, the third straight line segment, and the fourth straight line segment at the side walls of the inner contour on both sides, thereby completing the tunnel inner contour design.

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