A compact tunnel inner profile design method based on full shoulder width of highway

Abstract

The present application relates to a kind of compact tunnel inner profile design method based on highway full shoulder width, belong to underground engineering technical field.The method by collecting the basic information of the road section where tunnel is located, the highway clearance of the road section where tunnel is located and the additional clearance of soil shoulder width are drafted, and jointly constitute tunnel building clearance;From the top edge and top corner edge of highway clearance, top positioning base point is established, and top part of tunnel inner profile is drafted according to 5 base points+7 control points+3 arc segment method;From the bottom edge of tunnel building clearance, bottom positioning base point is established, and bottom part of tunnel inner profile is drafted according to 5 base points+7 control points+3 arc segment method;From the bottom edge of tunnel building clearance, bottom positioning base point is established, and two side walls of tunnel inner profile are drafted according to 2 base points+6 control points+4 straight line segment method;Top part, bottom part and two side walls of inner profile are combined to constitute complete tunnel inner profile.The present application can not only truly meet the requirement that tunnel should be same width with roadbed, but also avoid tunnel section space waste, with strong economy, practicality and application significance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground engineering, and particularly relates to a compact tunnel inner contour design method based on the full shoulder width of a highway. BACKGROUND

[0002] The tunnel inner contour section directly reflects the size of the available space in the tunnel, and is a basic guarantee for the normal use and safe operation of the tunnel. The design thereof is related to the rationality, safety and economy of the tunnel project. From the perspective of functional requirements, the tunnel inner contour should meet the space required by the tunnel building limit, the interior, the auxiliary facilities, the road surface and the ditch. The tunnel building limit is the space required to ensure the passage of vehicles and personnel in the tunnel, and is the primary analysis factor for the design of the tunnel inner contour.

[0003] The width of the tunnel building limit is composed of the lane width, the lateral width, the excess width and the maintenance path width, while the width of the road building limit in the roadbed section is composed of the lane width, the hard shoulder width and the soil shoulder width. The width of the road building limit in the roadbed section is greater than that of the tunnel building limit.

[0004] For the tunnel building limit and the inner contour design of the highway, there are two contradictions. On the one hand, because the limit width of the roadbed is greater than that of the tunnel, the road surface width often suddenly changes at the joint section of the roadbed and the tunnel, which directly affects the driving safety of the section. In view of this problem, the current industry standards “Technical Standards for Highway Engineering” (JTG B01-2014) and “Code for Design of Highway Tunnels” (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 reasonable, the tunnel inner contour section generally adopts a full-section arch shape. However, if the width of the tunnel building limit is increased to the same width as the roadbed, the width of the inner contour will also increase, the rise-span ratio of the upper arch and the lower arch of the tunnel will decrease, the structural stress will increase, and accordingly, more supporting materials are needed, and the investment increases.

[0005] In view of the above situation, most of the current highway tunnel designs do not consider the “tunnel should be the same width as the roadbed” problem. Although a small part of the tunnel designs considers the “tunnel should be the same width as the roadbed”, the width of the tunnel building limit only includes the width of the driving lane and the hard shoulder, the tunnel building limit directly uses the highway limit of the roadbed section, and does not include the width of the soil shoulder, and does not strictly implement the “tunnel should be the same width as the roadbed” regulation. In recent years, a few tunnels strictly implement the “tunnel should be the same width as the roadbed” regulation, the width of the tunnel building limit includes the width of the driving lane, the hard shoulder and the soil shoulder, and the corresponding inner contour adopts a full-section arch design. The tunnel has a large transverse span and the space in the inner contour is wasted, and the engineering investment increases sharply.

[0006] Therefore, how to overcome the deficiencies of the prior art is a problem that needs to be solved in the current technical field of underground engineering. SUMMARY

[0007] The present application aims at solving the problems of the prior art, and provides a compact tunnel inner contour design method based on full shoulder width of a highway, which comprises the following steps.

[0008] To achieve the above object, the technical scheme adopted by the present application is as follows.

[0009] A compact tunnel inner contour design method based on full shoulder width of a highway comprises the following steps.

[0010] Step (1), collecting basic information of a road section where a tunnel is located, wherein the basic information comprises highway grade, design speed and roadbed component condition; wherein the roadbed component condition comprises roadbed surface component condition of the tunnel road section and width condition of each component.

[0011] Step (2), determining highway clearance of the road section where the tunnel is located according to the provisions of “Highway Engineering Technical Standards” (JTG B01-2014).

[0012] Step (3), adding additional architectural clearance of soil shoulder width on both sides of the highway clearance determined in step (2) to jointly form tunnel architectural clearance.

[0013] Step (4), establishing five tunnel inner contour top positioning base points from the top edge and top corner edge of the highway clearance, determining seven inner contour top positioning control points according to the outer space requirement of the tunnel architectural clearance, drawing three circular arc lines from the control points, and determining the top of the tunnel inner contour by the method of 5 base points+7 control points+3 arc segments.

[0014] Step (5), establishing five tunnel inner contour bottom positioning base points from the bottom edge of the highway clearance, determining seven inner contour bottom positioning control points according to the outer space requirement of the tunnel architectural clearance, drawing three circular arc lines from the control points, and determining the bottom of the tunnel inner contour by the method of 5 base points+7 control points+3 arc segments.

[0015] Step (6), establish tunnel inner contour bottom positioning base point from highway limit bottom edge, determine 2 positioning control points on both sides of inner contour according to tunnel construction limit outer space requirement, and use 2 positioning control points on inner contour top and 2 positioning control points on inner contour bottom, total 6 control points, draw 4 straight line segments from control points, and design both sides of tunnel inner contour wall part according to 2 base points + 6 control points + 4 straight line segments method.

[0016] Step (7), based on the designed inner contour top, inner contour bottom and inner contour wall part on both sides, combine to form complete tunnel inner contour, and then perform construction according to the formed tunnel inner contour.

[0017] Further, preferably, in step (1), the tunnel section roadbed surface composition includes a driving lane surface, left and right side hard shoulder surfaces and left and right side soil shoulder surfaces; and the width conditions of each component include a driving lane surface width, left and right side hard shoulder surface widths and left and right side soil shoulder surface widths.

[0018] Further, preferably, in step (2), the highway limit is designed according to the provisions of the construction limit in “Technical Standards for Highway Engineering” (JTG B01-2014), and the bottom edge of the highway limit is located on the roadbed surface, the width of which includes the driving lane surface and hard shoulder surface widths but does not include the soil shoulder surface width.

[0019] Further, preferably, in step (3), the tunnel construction limit is composed of the highway limit and left and right side additional construction limits, each of which is a right triangle composed of a horizontal direction X straight side, a vertical direction Y straight side and a corresponding hypotenuse; wherein the horizontal direction X straight side is the bottom edge and the vertical direction Y straight side is the high edge.

[0020] The bottom edge is located on the soil shoulder surface and has the same width as the soil shoulder, the high edge of the additional construction limit is the same as the straight side of the highway limit, and the line segment between the outer end point of the bottom edge and the top point of the high edge is the hypotenuse.

[0021] Further, preferably, in step (4), the specific positions of the 5 positioning base points are: the first base point 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.

[0022] In step (4), the tunnel construction limit outer space requirement includes the space requirement outside the top and left and right top corners, which needs to meet the angle requirements for the arrangement of ventilation, lighting, signboards and monitoring facilities and equipment, the height requirement above the top edge of the highway limit and the width requirement outside the left and right top corner edges, and the tunnel top cross section shape adopts an arch shape and the inner contour is designed in segments according to a circular arc line in combination with the stress characteristics of the tunnel structure.

[0023] The top positioning control points are 7 in total, and the specific positions of the points are as follows: the first top positioning control point is located directly above the first top base point, the second top positioning control point is located to the left of the second top base point, the third top positioning control point is located to the right of the third top base point, the fourth top positioning control point is located to the left of the fourth top base point, the fifth top positioning control point is located to the right of the fifth top base point, the sixth top positioning control point is located below and to the left of the fourth top base point, and the seventh top positioning control point is located below and to the right of the fifth top base point; the minimum distances between the top positioning control points of the inner contour and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction are calculated based on the outer space requirements of the top and the left and right top corners, and the positions of the positioning control points are determined based on the minimum distances.

[0024] The top 3 arc segments of the inner contour are drawn through the top positioning control points, and the specific positions are as follows: the first top arc segment is drawn with the first top positioning control point as the midpoint and the second and third top positioning control points as the endpoints, the second top arc segment is drawn with the fourth top positioning control point as the midpoint and the sixth and second top positioning control points as the endpoints, and the third top arc segment is drawn with the fifth top positioning control point as the midpoint and the third and seventh top positioning control points as the endpoints; the first, second, and third top arc segments form the top of the inner contour.

[0025] Further, preferably, in step (5), the specific positions of the 5 positioning base points are as follows: the first bottom base point 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 edge 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 edge of the highway limit, the fourth base point is located at the left end point of the left additional limit bottom edge, and the fifth base point is located at the right end point of the right additional limit bottom edge.

[0026] In step (5), the outer space requirement of the tunnel construction limit is the bottom space requirement, which needs to meet the space requirements of the road surface foundation, drainage pipe trench, water supply pipe, and cable arrangement angle, and the height requirement of the space directly below the bottom edge of the limit and the width requirement of the gap outside the end points of the limit, and in combination with the stress characteristics of the tunnel structure, the bottom cross-section shape of the tunnel adopts an arch shape, and the inner contour is segmented and drafted according to a circular arc line.

[0027] The bottom positioning control points are 7 in total, and the specific positions of the points are as follows: the first bottom positioning control point is located directly below the first bottom base point, the second bottom positioning control point is located below and to the right of the second bottom base point, the third bottom positioning control point is located below and to the left of the third bottom base point, the fourth bottom positioning control point is located below and to the left of the second bottom base point, the fifth bottom positioning control point is located below and to the right of the third bottom base point, the sixth bottom positioning control point is located to the left of the fourth bottom base point, and the seventh bottom positioning control point is located to the right of the fifth bottom base point; the minimum distances between the bottom positioning control points of the inner contour and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction are calculated based on the bottom space requirement, and the positions of the positioning control points are determined based on the minimum distances.

[0028] The inner contour bottom 3 arc segments are drawn through the bottom positioning control points, specifically: the bottom first arc segment is drawn with the bottom positioning first control point as the midpoint and the second control point and the third control point as the endpoints, the bottom second arc segment is drawn with the fourth control point as the midpoint and the sixth control point and the second control point as the endpoints, and the bottom third arc segment is drawn with the fifth control point as the midpoint and the third control point and the seventh control point as the endpoints; the bottom first arc segment, the second arc segment and the third arc segment form the inner contour bottom.

[0029] Further, preferably, in step (6), the two positioning base points are positioned at the bottom fourth base point and the bottom fifth base point;

[0030] In step (6), the tunnel construction limit outer space requirement is the space requirement of the two side wall parts, which needs to meet the space requirement angle of the interior and the indication sign required space to the two side wall foot parts, that is, the additional limit bevel bottom outer side horizontal gap and the straight wall height requirement, and meanwhile, in combination with the tunnel structure stress characteristics, the two side wall parts of the tunnel are straight walls, and the inner contour is segmented and drafted according to straight lines;

[0031] The two side positioning control points are six in total, and the specific positions of the points are as follows: the left side positioning control point is located above the bottom fourth base point, and the right side positioning control point is located above the bottom fifth base point; the minimum distance between the two side positioning control points and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction is calculated through the space requirement of the left side and right side wall parts, so as to specifically determine the positions of the two side positioning control points by the minimum distance; in addition, the inner contour top sixth control point and the seventh control point, and the inner contour bottom sixth control point and the seventh control point are utilized;

[0032] The four straight line segments of the two side wall parts are drawn through the two side positioning control points, specifically: the wall part first straight line segment is a line segment connecting the bottom positioning sixth control point and the inner contour left side positioning control point, the wall part second straight line segment is a line segment connecting the bottom positioning seventh control point and the inner contour right side positioning control point, the wall part third straight line segment is a line segment connecting the inner contour left side positioning control point and the top positioning sixth control point, and the wall part fourth straight line segment is a line segment connecting the inner contour right side positioning control point and the top positioning seventh control point;

[0033] The wall part first straight line segment and the wall part third straight line segment are connected, and the wall part second straight line segment and the wall part fourth straight line segment are connected, and the four straight line segments form the inner contour two side wall parts.

[0034] Further, preferably, in step (7), the complete tunnel inner contour is composed of the inner contour top first arc segment, the second arc segment, the third arc segment, the inner contour bottom first arc segment, the second arc segment, the third arc segment, the inner contour two side wall part first straight line segment, the second straight line segment, the third straight line segment and the fourth straight line segment, that is, a total of six arc segments and four straight line segments, to complete the tunnel inner contour design.

[0035] The present application proposes a compact tunnel inner profile design method based on the full shoulder width of the highway, which meets the requirement that the tunnel should be the same width as the roadbed, and the building limit in the soil shoulder range is embodied in the form of a right triangle accessory limit from the actual function of the tunnel building limit; the straight side is used to replace the conventional arch side in the inner profile of the side wall of the tunnel on both sides to reduce the tunnel structure span and stress from the stress characteristics analysis of the tunnel; the compact tunnel inner profile space is determined from the actual space demand analysis outside the tunnel building limit to reduce the waste of inner profile space and save engineering investment, which has strong economic efficiency, practicality and application significance.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] The present application proposes a compact tunnel inner profile design method based on the full shoulder width of the highway, which meets the requirement that the tunnel should be the same width as the roadbed, and the building limit in the soil shoulder range is embodied in the form of a right triangle accessory limit from the actual function of the tunnel building limit; the straight side is used to replace the conventional arch side in the inner profile of the side wall of the tunnel on both sides to reduce the tunnel structure span and stress from the stress characteristics analysis of the tunnel; the compact tunnel inner profile space is determined from the actual space demand analysis outside the tunnel building limit to reduce the waste of inner profile space and save engineering investment, which has strong economic efficiency, practicality and application significance.

[0038] The present application provides a compact tunnel inner profile design method based on the full shoulder width of the highway, which has strong economic efficiency, practicality and application significance. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0040] Figure 1 Tunnel building limit, positioning point and inner profile overview map;

[0041] Figure 2 Tunnel roadbed, building limit, space demand outside the limit, positioning point and inner profile sectional view;

[0042] Figure 3 Composition diagram of the width of the roadbed surface of the tunnel section;

[0043] Figure 4 Composition diagram of the construction clearance of the tunnel;

[0044] Figure 5 Numbering diagram of the edges of the construction clearance of the tunnel;

[0045] Figure 6 Diagram of the required space outside the top and top corner of the tunnel clearance;

[0046] Figure 7 Diagram of the required space outside the bottom of the tunnel clearance;

[0047] Figure 8 Diagram of the required space outside the two side walls of the tunnel clearance;

[0048] Figure 9 Flowchart for positioning and defining the arc of the top of the inner contour of the tunnel;

[0049] Figure 10 Diagram of the positional relationship between the base point of the top and the control point of the inner contour;

[0050] Figure 11 Flowchart for positioning and defining the arc of the bottom of the inner contour of the tunnel;

[0051] Figure 12 Diagram of the positional relationship between the base point of the bottom and the control point of the inner contour;

[0052] Figure 13 Diagram of the positional relationship between the base point of the two sides of the bottom and the control point of the inner contour;

[0053] Figure 14 Diagram of the position of the control point of the two side walls of the inner contour of the tunnel;

[0054] Figure 15 Diagram of the straight line segment of the two side walls of the inner contour;

[0055] Figure 16 Schematic diagram of the assembly of the inner contour of the tunnel.

[0056] In each diagram:

[0057] 1. Roadbed surface of the tunnel section;

[0058] 11. Roadbed driving lane surface;

[0059] 12. Roadbed hard shoulder surface;

[0060] 121. Left hard shoulder surface;

[0061] 122. Right hard shoulder surface;

[0062] 13. Subgrade soil shoulder surface;

[0063] 131, left earth shoulder surface;

[0064] 132, right earth shoulder surface;

[0065] 2. Tunnel construction limits;

[0066] 21. Highway limits;

[0067] 211. Highway limit bottom edge;

[0068] 212. Top edge of highway limit;

[0069] 213. Left straight side of highway limit;

[0070] 214, right straight side of highway limit;

[0071] 215. Left top corner of highway limit;

[0072] 216, right top corner of highway limit;

[0073] 22. Additional limit on the left side;

[0074] 221. Additional limit X-direction right-angle side on the left;

[0075] 222, additional limit bevel on the left;

[0076] 223. Additional limit Y-direction right-angled edge on the left;

[0077] 23. Additional limit on the right side;

[0078] 231. Additional limit X-direction right angle side on the right side;

[0079] 232. Additional limiting hypotenuse on the right;

[0080] 233. Additional limit Y-direction right angle side on the right side;

[0081] 3. Demand space outside the limit;

[0082] 31. Top demand space;

[0083] 32. Space required outside the left top corner;

[0084] 33. Space required outside the right top corner;

[0085] 34. Bottom demand space;

[0086] 35. Space required on the left side wall;

[0087] 36. Space required on the right side wall;

[0088] 4. Tunnel contour positioning points;

[0089] 4a. Position at the top base point of the limit;

[0090] 4a1, the first base point at the top;

[0091] 4a2, the second base point at the top;

[0092] 4a3, the third base point at the top;

[0093] 4a4, the fourth base point at the top;

[0094] 4a5, the fifth base point at the top;

[0095] 4b. Positioning control point at the top of the inner contour;

[0096] 4b1. Locate the first control point at the top;

[0097] 4b2, locate the second control point at the top;

[0098] 4b3, locate the third control point at the top;

[0099] 4b4, locate the fourth control point at the top;

[0100] 4b5, locate the fifth control point at the top;

[0101] 4b6, locate the sixth control point at the top;

[0102] 4b7, locate the seventh control point at the top;

[0103] 4c. Position the bottom base point of the limit;

[0104] 4c1, the first base point of the bottom;

[0105] 4c2, the second base point at the bottom;

[0106] 4c3, the third base point at the bottom;

[0107] 4c4, the fourth base point at the bottom;

[0108] 4c5, the fifth base point from the bottom;

[0109] 4d, inner contour bottom positioning control point;

[0110] 4d1. Locate the first control point at the bottom;

[0111] 4d2, locate the second control point at the bottom;

[0112] 4d3, locate the third control point at the bottom;

[0113] 4d4, locate the fourth control point at the bottom;

[0114] 4d5, bottom-positioned fifth control point;

[0115] 4d6, bottom-positioned sixth control point;

[0116] 4d7, bottom-positioned seventh control point;

[0117] 4e, inner profile both-side positioned control point;

[0118] 4el, inner profile left-side positioned control point;

[0119] 4e2, inner profile right-side positioned control point;

[0120] 5, inner profile of tunnel;

[0121] 51, inner profile top;

[0122] 511, top first arc segment;

[0123] 512, top second arc segment;

[0124] 513, top third arc segment;

[0125] 52, inner profile bottom;

[0126] 521, bottom first arc segment;

[0127] 522, bottom second arc segment;

[0128] 523, bottom third arc segment;

[0129] 53, inner profile both-side wall portion;

[0130] 531, wall portion first straight segment;

[0131] 532, wall portion second straight segment;

[0132] 533, wall portion third straight segment;

[0133] 534, wall portion fourth straight segment. DETAILED DESCRIPTION

[0134] The present application will be further described with reference to the following examples.

[0135] Those skilled in the art will appreciate that the following examples are intended to be illustrative only and are not intended to limit the scope of the present application. Unless otherwise indicated, technical or conditions not specified in the examples were performed according to techniques or conditions described in the literature or according to the manufacturer's instructions. Where the manufacturer of reagents, instruments, etc. is not indicated, it should be assumed to be a conventional one available from commercial sources. Example 1

[0136] A compact tunnel inner contour design method based on full shoulder width of highway, comprising the following steps:

[0137] Step (1), collecting basic information of the tunnel section, the basic information including highway grade, design speed and roadbed component condition; wherein the roadbed component condition includes roadbed surface component condition and width condition of each component of the tunnel section

[0138] Step (2), determining the highway limit of the tunnel section according to the provisions of "Technical Standards for Highway Engineering" (JTG B01-2014);

[0139] Step (3), based on the highway limit determined in step (2), adding additional building limit containing soil shoulder width on both sides to jointly form the tunnel building limit;

[0140] Step (4), establishing 5 positioning base points of the top of the tunnel inner contour from the top edge and top corner edge of the highway limit, determining 7 positioning control points of the top of the tunnel inner contour according to the outer space requirement of the tunnel building limit, drawing 3 circular arc lines from the control points, and determining the top of the tunnel inner contour by the method of 5 base points + 7 control points + 3 arc segments;

[0141] Step (5), establishing 5 positioning base points of the bottom of the tunnel inner contour from the bottom edge of the highway limit, determining 7 positioning control points of the bottom of the tunnel inner contour according to the outer space requirement of the tunnel building limit, drawing 3 circular arc lines from the control points, and determining the bottom of the tunnel inner contour by the method of 5 base points + 7 control points + 3 arc segments;

[0142] Step (6), establishing positioning base points of the bottom of the tunnel inner contour from the bottom edge of the highway limit, determining 2 positioning control points of the two sides of the tunnel inner contour according to the outer space requirement of the tunnel building limit, and drawing 4 straight line segments from the 6 control points including 2 positioning control points of the top of the tunnel inner contour, 2 positioning control points of the bottom of the tunnel inner contour, and determining the side wall part of the tunnel inner contour by the method of 2 base points + 6 control points + 4 straight line segments.

[0143] Step (7), combining the top of the tunnel inner contour, the bottom of the tunnel inner contour and the side wall part of the tunnel inner contour to form a complete tunnel inner contour, and then constructing according to the formed tunnel inner contour. Example 2

[0144] A compact tunnel inner contour design method based on full shoulder width of highway, comprising the following steps:

[0145] Step (1), collecting basic information of the tunnel section, the basic information including highway grade, design speed and roadbed component condition; wherein the roadbed component condition includes roadbed surface component condition and width condition of each component of the tunnel section

[0146] Step (2), the highway limit of the road section where the tunnel is located is determined according to the provisions of Highway Engineering Technical Standard (JTG B01-2014);

[0147] Step (3), based on the highway limit determined in step (2), additional building limits containing the width of the soil shoulder are added on both sides to form the tunnel building limit together;

[0148] Step (4), 5 positioning base points of the top of the tunnel inner contour are established from the top edge and the top corner edge of the highway limit, 7 positioning control points of the top of the tunnel inner contour are determined according to the outer space requirement of the tunnel building limit, 3 circular arc lines are drawn from the control points, and the top of the tunnel inner contour is determined by the method of 5 base points + 7 control points + 3 arc segments;

[0149] Step (5), 5 positioning base points of the bottom of the tunnel inner contour are established from the bottom edge of the highway limit, 7 positioning control points of the bottom of the tunnel inner contour are determined according to the outer space requirement of the tunnel building limit, 3 circular arc lines are drawn from the control points, and the bottom of the tunnel inner contour is determined by the method of 5 base points + 7 control points + 3 arc segments;

[0150] Step (6), positioning base points of the bottom of the tunnel inner contour are established from the bottom edge of the highway limit, 2 positioning control points of the side walls of the tunnel inner contour are determined according to the outer space requirement of the tunnel building limit, and 2 positioning control points of the top of the tunnel inner contour, 2 positioning control points of the bottom of the tunnel inner contour, and a total of 6 control points are used to draw 4 straight line segments, and the side walls of the tunnel inner contour are determined by the method of 2 base points + 6 control points + 4 straight line segments.

[0151] Step (7), based on the combined top, bottom and side walls of the tunnel inner contour, a complete tunnel inner contour is formed, and then the tunnel is constructed according to the formed tunnel inner contour.

[0152] In step (1), the roadbed surface of the tunnel road section is composed of the driving surface, the hard shoulder surfaces on the left and right sides, and the soil shoulder surfaces on the left and right sides; the width of each component includes the width of the driving surface, the width of the hard shoulder surfaces on the left and right sides, and the width of the soil shoulder surfaces on the left and right sides.

[0153] In step (2), the highway limit is determined according to the provisions of the Highway Engineering Technical Standard (JTG B01-2014) building limit, and the bottom edge of the highway limit is located on the roadbed surface, which includes the width of the driving surface and the hard shoulder surface, but does not include the width of the soil shoulder.

[0154] In step (3), the tunnel building limit is composed of the highway limit and the additional building limits on the left and right sides, and each additional building limit on the left and right sides is a right triangle composed of a horizontal direction X straight edge and a vertical direction Y straight edge and a corresponding hypotenuse; wherein the horizontal direction X straight edge is the bottom edge, and the vertical direction Y straight edge is the high edge;

[0155] The bottom edge is located on the surface of the shoulder and has the same width as the shoulder, the high edge of the additional building limit is the same as the straight side of the highway limit, and the line segment between the outer end point of the bottom edge and the top point of the high edge is the oblique edge.

[0156] 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.

[0157] In step (4), the outer space requirement of the tunnel building limit includes the space requirement outside the top and left and right top corners, which needs to meet the angle requirement of ventilation, lighting, signboard and monitoring facility equipment arrangement, and the height requirement above the top edge of the highway limit and the width requirement outside the left and right top corner edges, and at the same time, combined with the stress characteristics of the tunnel structure, the top section shape of the tunnel adopts an arch shape, and the inner contour is segmented and drafted according to circular arcs.

[0158] There are 7 top positioning control points, and the specific positions of each point are: the first top positioning control point is located directly above the first base point at the top, the second control point is located to the left of the second base point, the third control point is located to the right of the third base point, the fourth control point is located to the left of the fourth base point, the fifth control point is located to the right of the fifth base point, the sixth control point is located below the fourth base point to the left, and the seventh control point is located below the fifth base point to the right; the minimum distance between the top positioning control points and the positioning base points in the horizontal X-axis direction and the vertical Y-axis direction is calculated based on the space requirement outside the top and left and right top corners, and the positions of each positioning control point are determined based on the minimum distance.

[0159] The three arc segments of the inner contour top are drawn through the top positioning control points, 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, and 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 top first arc segment, the second arc segment and the third arc segment form the inner contour top.

[0160] In step (5), the specific positions of the five positioning base points are: the first base point at 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 edge 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 edge of the highway limit, the fourth base point is located at the left end point of the left additional limit bottom edge, and the fifth base point is located at the right end point of the right additional limit bottom edge.

[0161] 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-section shape of the tunnel bottom is arched, and the inner contour is segmented according to the arc line.

[0162] There are a total of 7 bottom positioning control points. 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 based on the bottom required space, and the position of each positioning control point is specifically determined based on the minimum distance.

[0163] The three arc segments of the bottom of the inner contour are drawn through the bottom positioning control points. Specifically, the first arc segment of 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 of 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 of 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 bottom of the inner contour.

[0164] 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;

[0165] 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 oblique edge and the height requirement of the straight side wall, is required. At the same time, considering 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.

[0166] There are a total of 6 positioning control points on both sides. The specific positions of each point are as follows: the left positioning control point is located above the left of the fourth base point at the bottom, and the right positioning control point is located above the 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 based on the required space of the left and right side walls. 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.

[0167] The four straight line segments of the two side wall portions 4 are drawn through two side positioning control points, specifically: the first straight line segment of the side wall portion is a line segment connecting the sixth control point of the bottom positioning and the left side control point of the inner contour positioning, the second straight line segment of the side wall portion is a line segment connecting the seventh control point of the bottom positioning and the right side control point of the inner contour positioning, the third straight line segment of the side wall portion is a line segment connecting the left side control point of the inner contour positioning and the sixth control point of the top positioning, and the fourth straight line segment of the side wall portion is a line segment connecting the right side control point of the inner contour positioning and the seventh control point of the top positioning.

[0168] The first straight line segment of the side wall portion and the third straight line segment of the side wall portion are connected, and the second straight line segment of the side wall portion and the fourth straight line segment of the side wall portion are connected, and the four straight line segments form the two side wall portions of the inner contour.

[0169] In step (7), the complete tunnel inner contour is composed of the first, second, and third arc segments of the top inner contour, the first, second, and third arc segments of the bottom inner contour, the first, second, third, and fourth straight line segments of the two side wall portions of the inner contour, a total of six arc segments and four straight line segments, and the design of the tunnel inner contour is completed.

[0170] Application Example

[0171] As shown in Figure 1 , Figure 2 , a certain embodiment of a highway tunnel adopts a scheme in which the width of the tunnel section subgrade 1 is entirely contained in the tunnel, and at the same time, in order to take into account the economy, the tunnel cross section needs to be designed as compact as possible, a compact tunnel inner contour design method based on the full road shoulder width of the highway is adopted, the construction limit 2 is designed, the demand space 3 outside the tunnel limit is analyzed, the positioning points 4 of the tunnel inner contour are established, and the tunnel inner contour 5 is drawn, and the specific implementation is as follows:

[0172] (1) Collect the basic information of the tunnel section, including the highway grade, the design speed, and the roadbed component situation.

[0173] The tunnel section is a two-lane highway with a design speed of 80 km / h, and the tunnel section subgrade surface 1 is composed of a roadbed driving surface 11, a roadbed hard shoulder surface 12, and a roadbed soil 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 soil shoulder surface 13 includes a left soil shoulder surface 131 and a right soil shoulder surface 132.

[0174] The tunnel road section roadbed surface 1 is 12.75 m wide, and the width of each component is: the roadbed driving lane surface 11 is 7.5 m wide, the roadbed hard shoulder surface 12 is 3.75 m wide, the left hard shoulder surface 121 is 0.75 m wide, the right hard shoulder surface 122 is 3.00 m wide, the roadbed soil shoulder surface 13 is 1.5 m wide, the left soil shoulder surface 131 is 0.75 m wide, and the right soil shoulder surface 132 is 0.75 m wide.

[0175] (2) The highway clearance of the road section where the tunnel is located is determined according to the provisions of the Highway Engineering Technical Standard (JTG B01).

[0176] The highway clearance 21 is determined according to the provisions of the Highway Engineering Technical Standard (JTG B01) "Building Clearance" section, and the clearance bottom edge 211 of the highway clearance 21 coincides with the tunnel road section roadbed surface 1, and the width of the clearance bottom edge 211 is 11.25 m, which is the sum of the widths of the roadbed driving lane surface 11 and the roadbed hard shoulder surface 12, and does not include the width of the 1.5 m roadbed soil shoulder surface 13.

[0177] (3) Based on the highway clearance determined in step (2), additional building clearances containing soil shoulder widths are added on both sides to form the tunnel building clearance together.

[0178] The additional building clearances include a left additional clearance 22 and a right additional clearance 23, both of which are right-angled triangles.

[0179] The left additional clearance X-direction right-angle edge 221 coincides with and has the same width as the left soil shoulder surface 131, the left additional clearance oblique edge 222 is a line connecting the left end point of the left additional clearance X-direction right-angle edge 221 and the upper end point of the left straight side edge 213 of the highway clearance, and the left additional clearance Y-direction right-angle edge 223 is the same as the left straight side edge 213 of the highway clearance.

[0180] The right additional clearance X-direction right-angle edge 231 coincides with and has the same width as the right soil shoulder surface 132, the right additional clearance oblique edge 232 is a line connecting the right end point of the right additional clearance X-direction right-angle edge 231 and the upper end point of the right straight side edge 214 of the highway clearance, and the right additional clearance Y-direction right-angle edge 233 is the same as the right straight side edge 214 of the highway clearance.

[0181] The tunnel building clearance 2 is composed of the highway clearance 21 and the left additional clearance 22 and the right additional clearance 23.

[0182] (4) Five tunnel inner contour top positioning base points are established from the highway clearance top edge and the top corner edge, seven tunnel inner contour top positioning control points are determined according to the space requirement of the tunnel building clearance, three circular arc lines are drawn according to the control points, and the top of the tunnel inner contour is determined by the "5 base points + 7 control points + 3 arc segments" method.

[0183] There are five top base points 4a located on the limit among the tunnel inner contour positioning points 4. The specific positions of each point are as follows: the first top base point 4a1 is located at the midpoint of the top edge 212 of the highway limit, the second top base point 4a2 is located at the midpoint of the left top corner edge 215 of the highway limit, the third top base point 4a3 is located at the midpoint of the right top corner edge 216 of the highway limit, the fourth top base point 4a4 is located at the lower end point of the left top corner edge 215 of the highway limit, and the fifth top base point 4a5 is located at the lower end point of the right top corner edge 216 of the highway limit.

[0184] Analyze 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: 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 ventilation, lighting, signboards, and monitoring facilities and equipment. The minimum required height directly above the highway limit top edge 212 gradually decreases from 1.80m in the middle to 0.15m on both sides. The left top corner edge 215 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 inner contour top 51 in the tunnel inner contour 5 adopts an arch, and is proposed to be segmented using circular arc lines.

[0185] The inner contour top 51 is defined by the inner contour top positioning control points 4b. There are seven inner contour top positioning control points 4b in total. The specific positions of the points are as follows: the first top positioning control point 4b1 is located directly above the first top base point 4a1, the second top positioning control point 4b2 is located to the left of the second top base point 4a2, the third top positioning control point 4b3 is located to the right of the third top base point 4a3, the fourth top positioning control point 4b4 is located to the left of the fourth top base point 4a4, the fifth top positioning control point 4b5 is located to the right of the fifth top base point 4a5, the sixth top positioning control point 4b6 is located to the lower left of the fourth top base point 4a4, and the seventh top positioning control point 4b7 is located to the lower right of the fifth top base point 4a5.

[0186] The minimum distances in the X-axis and Y-axis directions between the inner contour top positioning control point 4b and the top base point 4a located at the limit are specifically calculated using 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. The position of each control point is determined using the minimum distance in Table 1.

[0187] Table 1 Distance between top base point and control point

[0188]

[0189] The inner contour top 51 is composed of three arc segments drawn by the inner contour top positioning control points 4b. 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 the 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 the 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 the endpoints; the top first arc segment 511, the top second arc segment 512 and the top third arc segment 513 form the inner contour top 51.

[0190] (5) 5 base points are established from the bottom edge of the highway limit, 7 positioning control points of the inner contour bottom are determined according to the outer space demand of the tunnel construction limit, 3 circular arc lines are drawn according to the control points, and the bottom of the tunnel inner contour is drawn according to the method of "5 base points + 7 control points + 3 arc segments".

[0191] The 5 bottom base points 4c of the positioning points 4 of the tunnel inner contour are located in the limit, 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 edge 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 edge 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.

[0192] The bottom demand space 34 of the limit outer demand space 3 outside the tunnel construction limit 2 is analyzed: the bottom demand space 34 should be able to meet the space requirements of road surface foundation, drainage pipe trench, water supply pipe and cable arrangement, the minimum demand height directly below the bottom edge 211 of the highway limit gradually decreases from 1.75m in the middle to 0m on both sides, and there is 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 stress of the tunnel structure, the cross-sectional shape of the inner contour bottom 52 in the tunnel inner contour 5 adopts an arch shape, and is drawn by using circular arc lines.

[0193] The inner contour bottom 52 is drawn by the inner contour bottom positioning control points 4d. There are 7 inner contour bottom positioning control points 4d, and the specific positions of the control points are as follows: the bottom positioning first control point 4d1 is located directly below the bottom first base point 4c1, the bottom positioning second control point 4d2 is located below and to the right of the bottom second base point 4c2, the bottom positioning third control point 4d3 is located below and to the left of the bottom third base point 4c3, the bottom positioning fourth control point 4d4 is located below and to the left of the bottom second base point 4c2, the bottom positioning fifth control point 4d5 is located below and to the right of the bottom third base point 4c3, the bottom positioning sixth control point 4d6 is located to the left of the bottom fourth base point 4c4, and the bottom positioning seventh control point 4d7 is located to the right of the bottom fifth base point 4c5.

[0194] The minimum distances in the X-axis direction and the Y-axis direction between the inner contour bottom positioning control points 4d and the bottom base points 4c positioned in the limit are calculated according to the bottom required space 34, as shown in Table 2. The positions of the control points are determined according to the minimum distances in Table 2.

[0195] Table 2 Distance between bottom base points and control points

[0196]

[0197] The inner contour bottom 52 is drawn by the inner contour bottom positioning control points 4d. There are 7 inner contour bottom positioning control points 4d, and the specific positions of the control points are as follows: the bottom positioning first control point 4d1 is located directly below the bottom first base point 4c1, the bottom positioning second control point 4d2 is located below and to the right of the bottom second base point 4c2, the bottom positioning third control point 4d3 is located below and to the left of the bottom third base point 4c3, the bottom positioning fourth control point 4d4 is located below and to the left of the bottom second base point 4c2, the bottom positioning fifth control point 4d5 is located below and to the right of the bottom third base point 4c3, the bottom positioning sixth control point 4d6 is located to the left of the bottom fourth base point 4c4, and the bottom positioning seventh control point 4d7 is located to the right of the bottom fifth base point 4c5.

[0198] (6) Establish tunnel inner contour bottom positioning base points from the highway limit bottom edge, determine 2 inner contour side positioning control points according to the outer space requirement of the tunnel construction limit, and use 2 inner contour top positioning control points and 2 inner contour bottom positioning control points, a total of 6 control points, to draw 4 straight line segments from the control points, and draw the tunnel inner contour side walls according to the "2 base points + 6 control points + 4 straight line segments" method.

[0199] The two side positioning base points of the tunnel are the bottom fourth base point 4c4 and the bottom fifth base point 4c5 in the tunnel inner contour positioning points 4 positioned in the limit;

[0200] The left side wall part demand space 35 and the right side wall part demand space 36 of the limit outside demand space 3 outside the tunnel construction limit 2 are analyzed: the left side wall part demand space 35 and the right side wall part demand space 36 should be able to meet the space requirements of the interior and the signs, the minimum horizontal clearance of the bottom outside of the left side additional limit bevel 222 and the bottom outside of the right side additional limit bevel 232 of the two side wall feet is 0.05 m, and the minimum height of the straight side wall is 0.20 m, and meanwhile, in combination with the comprehensive analysis of the tunnel structure stress, the two side wall parts 53 of the inner contour of the tunnel contour 5 are all straight walls, and are planned to be divided into four straight line segments.

[0201] The two side wall parts 53 of the inner contour are drawn through the two side positioning control points 4e of the inner contour, two inner contour top positioning control points 4b and two inner contour bottom positioning control points 4d; the specific positions of the two side positioning control points 4e of the inner contour are that the inner contour left side positioning control point 4e1 is located above the left of the fourth base point 4c4 at the bottom, and the inner contour right side positioning control point 4e2 is located above the right of the fifth base point 4c5 at the bottom; the minimum distances of the X-axis direction and the Y-axis direction between the two side positioning control points 4e of the inner contour and the bottom base points 4c positioned at the limit are calculated through the left side wall part demand space 35 and the right side wall part demand space 36, as shown in Table 3, and the point positions of the control points are determined according to the minimum distances in Table 3;

[0202] Table 3 Distance between bottom base points and two side positioning control points

[0203]

[0204] The two inner contour top positioning control points 4b are the top positioning sixth control point 4b6 and the top positioning seventh control point 4b7, and the two inner contour bottom positioning control points 4d are the bottom positioning sixth control point 4d6 and the bottom positioning seventh control point 4d7.

[0205] The two side wall parts 53 of the inner contour are drawn through the six positioning control points 4d to draw four straight line segments, and the specific drawing methods of the straight line segments are that the wall part first straight line segment 531 is a line segment connecting the bottom positioning sixth control point 4d6 and the inner contour left side positioning control point 4e1, the wall part second straight line segment 532 is a line segment connecting the bottom positioning seventh control point 4d7 and the inner contour right side positioning control point 4e2, the wall part third straight line segment 533 is a line segment connecting the inner contour left side positioning control point 4e1 and the top positioning sixth control point 4b6, and the wall part fourth straight line segment 534 is a line segment connecting the inner contour right side positioning control point 4e2 and the top positioning seventh control point 4b7; the wall part first straight line segment 531 and the wall part third straight line segment 533 are connected, the wall part second straight line segment 532 and the wall part fourth straight line segment 534 are connected, and the four straight line segments form the two side wall parts 53 of the inner contour.

[0206] (7) combine the inner contour top, the inner contour bottom and the inner contour side wall part of the previous steps to form a complete tunnel inner contour.

[0207] 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 part first straight line segment 531, the side wall part second straight line segment 532, the side wall part third straight line segment 533, the side wall part fourth straight line segment 534 of the inner contour side wall part 53, a total of 6 arc segments and 4 straight line segments jointly form the tunnel inner contour 5.

[0208] The tunnel inner contour of the present embodiment is designed by using the above method, and then the tunnel is constructed according to the formed tunnel inner contour.

[0209] By comparing the present application with the existing engineering technology, the tunnel inner contour designed according to the method of the present application strictly meets the requirement of the same width of the tunnel and the roadbed, is beneficial to improve the traffic capacity of the vehicle passing through the tunnel, and guarantees the driving safety; compared with the current tunnel which is designed according to the same width of the roadbed, has a large inner contour section and a large space waste, the compact inner contour tunnel designed according to the method of the present application can save the engineering investment by more than 30%.

[0210] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended 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 of the road section where the tunnel is located, including the road grade, design speed and roadbed components; the roadbed components include the surface composition of the tunnel section roadbed and the width of each component. Step (2): Draft the highway limits of the section where the tunnel is located according to the provisions of the 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 earthen shoulders are added on both sides of the highway limit to form the tunnel construction limit; Step (4): establish five base points for positioning the top of the tunnel inner contour from the top edge and top corner edge of the highway limit, determine seven control points for positioning the top of the inner contour according to the space requirements outside the tunnel construction limit, draw three arcs from the control points, and formulate the top of the tunnel inner contour according to the method of 5 base points + 7 control points + 3 arc segments; Step (5): establish five base points for positioning the bottom of the tunnel inner contour from the bottom edge of the highway limit, determine seven control points for positioning the bottom of the inner contour according to the space requirements outside the tunnel construction limit, draw three arcs from the control points, and formulate the bottom of the tunnel inner contour according to the method of 5 base points + 7 control points + 3 arcs; Step (6) establishes the bottom positioning base point 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 formulates the side walls 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, inner contour bottom and both 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; There are a total of 7 top positioning control points, and the specific positions of each point are as follows: the first top positioning control point is located directly above the first top base point, the second control point is located to the left of the second base point, the third control point is located to the right of the third base point, the fourth control point is located to the left of the fourth base point, the fifth control point is located to the right of the fifth base point, the sixth control point is located to the lower left of the fourth base point, and the seventh control point is located to 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 based on 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 and third control points as endpoints; the second arc segment at the top is drawn with the fourth top positioning control point as the midpoint, and the sixth and second control points as endpoints; the third arc segment at the top is drawn with the fifth top positioning 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 at the top constitute the top of the inner contour.

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

3. The compact tunnel inner profile design method based on the full shoulder width of a highway according to claim 1, 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 a highway according to claim 1, 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 horizontal X-direction right angle side, the vertical Y-direction right angle side and the corresponding hypotenuse; wherein the horizontal X-direction right angle side is the base side, and the vertical Y-direction right angle side is the height side; 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 and the straight side of the highway limit are the same side. The line segment between the outer end point 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 a highway according to claim 1 is 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 requirements outside the tunnel construction limit include the space requirements at the top and outside the left and right 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 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.

6. The compact tunnel inner profile design method based on the full shoulder width of a 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 at 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-section shape of the tunnel bottom is arched, and the inner contour is segmented according to the arc line. There are a total of 7 bottom positioning control points. 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 based on the bottom required space, and the position of each positioning control point is specifically determined based on the minimum distance. The three arc segments at the bottom of the inner contour are drawn using 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 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 method for designing the inner contour of a compact tunnel based on the full shoulder width of a 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 oblique edge and the height requirement of the straight side wall, is required. At the same time, considering 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 a total of 6 positioning control points on both sides. The specific positions of each point are as follows: the left positioning control point is located above the left of the fourth base point at the bottom, and the right positioning control point is located above the 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 based on the required space of the left and right side walls. 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. 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 walls on both sides of the inner contour.

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

Images