Extremely soft rock tunnel construction method
By setting up drainage holes and grouting pipes in the construction of the extremely soft rock tunnel, the construction safety risks caused by water and sand rushing are solved, and the effect of reducing groundwater levels and enhancing the stability of surrounding rocks is achieved, ensuring the normal excavation of the tunnel.
Patent Information
- Application Number
- CN202510151622.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-05-23
Smart Images
Figure CN120026922A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of tunnel engineering, and in particular to a method for constructing an extremely soft rock tunnel. Background Art
[0002] During the construction of the extremely soft rock tunnel, two different media are encountered, one is permeable and the other is impermeable. When the impermeable layer is opened, due to the high groundwater level and the extremely low strength of the extremely soft rock, a sudden gushing of water and sand will occur, resulting in the destruction of the initial support at the rear, deformation or collapse, damage to mechanical equipment, and even personal injury. Summary of the invention
[0003] In order to solve the above technical problems, the present application provides an extremely soft rock tunnel construction method for improving the safety and reliability of extremely soft rock tunnel construction.
[0004] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:
[0005] An embodiment of the present application provides a very soft rock tunnel construction method, which includes: setting drainage holes connected to the tunnel on both sides of the surrounding rock of the tunnel to be excavated in the width direction, and extending the drainage holes to a first preset length along the length direction of the tunnel; setting drainage pipes on the drainage holes, and discharging water discharged from the drainage pipes to the outside; setting a grouting wall on the heading of the surrounding rock of the tunnel to be excavated; driving a plurality of grouting pipes into the grouting wall, and extending the grouting pipes into the surrounding rock of the tunnel to be excavated by a second preset length; consolidating the surrounding rock of the tunnel to be excavated by grouting equipment; wherein the second preset length is less than the first preset length.
[0006] According to the extremely soft rock tunnel construction method of the embodiment of the present application, by setting drainage holes on both sides of the tunnel width direction, the water in the extremely soft rock can be discharged in advance through the drainage holes. At the same time, by setting a grouting wall on the face of the surrounding rock of the tunnel to be excavated and driving a grouting pipe into the grouting wall, the stability of the surrounding rock can be enhanced, the safety risk of extremely soft rock on-site construction can be effectively reduced, and the normal excavation of the effective section tunnel can be ensured.
[0007] In some embodiments, a drainage pipe is arranged on the drainage hole, and the water discharged from the drainage pipe is discharged to the outside. The specific steps include: a drainage ditch is arranged on the bottom wall of the drainage hole, and the drainage ditch is connected with the drainage trough of the tunnel; the drainage pipe is arranged on the drainage hole, and the water discharged from the drainage pipe flows into the drainage ditch.
[0008] In some embodiments, the drainage pipe is arranged on the drainage tunnel, and the water discharged from the drainage pipe is made to flow into the drainage ditch. The specific steps include: a plurality of advance drainage pipes are arranged on the heading face of the drainage tunnel, the advance drainage pipes are extended along the axial direction of the drainage tunnel, and the water in the advance drainage pipes is made to flow into the drainage ditch.
[0009] In some embodiments, a plurality of advance drainage pipes are arranged on the heading face of the drainage tunnel, so that the advance drainage pipes extend along the axial direction of the drainage tunnel, and the water in the advance drainage pipes flows into the drainage ditch. The specific steps include: a plurality of advance drainage pipes are arranged on the heading face of the drainage tunnel, so that the advance drainage pipes extend along the axial direction of the drainage tunnel; a connecting pipe is arranged in the drainage tunnel, so that the plurality of advance drainage pipes are connected with the drainage ditch through the connecting pipe.
[0010] In some embodiments, a plurality of advance drainage pipes are arranged on the face of the drainage tunnel, so that the advance drainage pipes extend along the axial direction of the drainage tunnel. The specific steps include: wrapping a filter net on the outside of the advance drainage pipe; setting a mounting hole on the face of the drainage tunnel; and passing the advance drainage pipe through the mounting hole, so that the advance drainage pipe extends along the axial direction of the drainage tunnel.
[0011] In some embodiments, the drainage pipe is arranged on the drainage hole, and the water discharged from the drainage pipe is made to flow into the drainage ditch. The specific steps include: arranging a plurality of advance drainage pipes on the heading face of the drainage hole, extending the advance drainage pipes along the axial direction of the drainage hole, and making the water in the advance drainage pipes flow into the drainage ditch; arranging a plurality of radial drainage pipes on the inner wall of the drainage hole, extending the radial drainage pipes along the radial direction of the drainage hole.
[0012] In some embodiments, a plurality of radial drainage pipes are arranged on the inner wall of the drainage hole so that the radial drainage pipes extend along the radial direction of the drainage hole. The process specifically includes the following steps: a plurality of drainage sections are arranged in the drainage hole, and the plurality of drainage sections are arranged at intervals along a first spacing in the extension direction of the drainage hole; a plurality of radial drainage pipes are arranged on the inner wall of the drainage section so that the radial drainage pipes extend along the radial direction of the drainage section.
[0013] In some embodiments, drainage holes connected to the tunnel are set on both sides of the width direction of the surrounding rock of the tunnel to be excavated, and the drainage holes are extended by a first preset length along the length direction of the tunnel. The specific steps include: a first drainage section of the drainage hole connected to the tunnel is set on both sides of the width direction of the surrounding rock of the tunnel to be excavated, and the distance between the free end of the first drainage section and the tunnel is set to a first preset distance; a second drainage section of the drainage hole connected to the first drainage section is set at the free end of the first drainage section, and the second drainage section is extended from the face of the surrounding rock of the tunnel to be excavated by a first preset length in the length direction of the tunnel.
[0014] In some embodiments, multiple grouting pipes are driven into the stop wall, and the grouting pipes are extended into the surrounding rock of the tunnel to be excavated by a second preset length. The specific steps include: driving multiple grouting pipes into the stop wall at different angles; and driving the grouting pipes into the surrounding rock of the tunnel to be excavated by a second preset length.
[0015] In some embodiments, the extremely soft rock tunnel construction method also includes: excavating a third preset length of the surrounding rock of the tunnel to be excavated; setting drainage holes connected to the tunnel on both sides of the tunnel after excavation, and extending the drainage holes along the length direction of the tunnel by a fourth preset length; wherein the fourth preset length is greater than the second preset length and less than the first preset length, and the third preset length is less than the second preset length. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0018] Figure 1 A schematic diagram of the construction of an extremely soft rock tunnel provided in some embodiments of the present application;
[0019] Figure 2 A schematic diagram of a drainage hole provided in some embodiments of the present application;
[0020] Figure 3 A top view of the construction of an extremely soft rock tunnel provided for some embodiments of the present application.
[0021] Reference numerals:
[0022] 100. Extremely soft rock tunnel;
[0023] 1. Surrounding rock of the tunnel to be excavated;
[0024] 2. Tunnel; 21. Drainage ditch;
[0025] 3. Drainage hole; 31. Drainage ditch; 32. Drainage pipe; 321. Advanced drainage pipe; 322. Connecting pipe; 323. Radial drainage pipe; 33. First drainage section; 34. Second drainage section;
[0026] 4. Stop wall;
[0027] 5. Grouting pipe;
[0028] 6. Grouting equipment. DETAILED DESCRIPTION
[0029] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0032] In the description of the embodiments of the present application, the term "and / or" refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present application generally indicates that the associated objects before and after are in an "or" relationship.
[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. In addition, the directional terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only references to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0034] In the description of the embodiments of the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0035] During the construction of the extremely soft rock tunnel, two different media are encountered, one is permeable and the other is impermeable. When the impermeable layer is opened, due to the high groundwater level and the extremely low strength of the extremely soft rock, a sudden gushing of water and sand will occur, resulting in the destruction of the initial support at the rear, deformation or collapse, damage to mechanical equipment, and even personal injury.
[0036] In order to solve the above technical problems, the present application provides a very soft rock tunnel construction method.
[0037] The extremely soft rock tunnel construction method of the embodiment of the present application is described below.
[0038] See also Figure 1-Figure 3 , Figure 1 A schematic diagram of the construction of an extremely soft rock tunnel provided in some embodiments of the present application, Figure 2 A schematic diagram of a drainage hole provided in some embodiments of the present application, Figure 3 A top view of the construction of an extremely soft rock tunnel provided in some embodiments of the present application. The construction method of the extremely soft rock tunnel 100 includes:
[0039] S1: Drainage holes 3 connected to the tunnel 2 are arranged on both sides of the surrounding rock 1 of the tunnel to be excavated in the width direction, and the drainage holes 3 are extended by a first preset length along the length direction of the tunnel 2. Specifically, drainage holes 3 are arranged on both sides of the tunnel 2 in the width direction, one end of the drainage hole 3 is connected to the tunnel 2, and the other end is along the length direction of the tunnel 2 and extends by a first preset length.
[0040] For example, the structure of the drainage tunnel 3 can be a straight wall type with a clearance size of 3m×3.5m (width×height). Anchor spraying mesh support can be adopted, and 20-type steel frames are arranged in the whole ring, with a steel frame spacing of 0.5m / frame. Φ22 longitudinal connecting bars are used in the whole ring, and Φ8 steel mesh is arranged in the arch wall with a mesh spacing of 20×20cm. C25 concrete is sprayed in the whole ring with a thickness of 20cm. This is conducive to ensuring the strength of the drainage tunnel 3 and avoiding collapse.
[0041] S2: A drainage pipe 32 is provided on the drainage hole 3, and the water discharged from the drainage pipe 32 is discharged to the outside. Specifically, the drainage pipe 32 can be provided on the inner wall of the drainage hole 3, so that the drainage pipe 32 extends into the extremely soft rock, so that the water in the extremely soft rock can be discharged through the drainage pipe 32, and then the water discharged from the drainage pipe 32 is transported to the outside through the tunnel 2.
[0042] S3: A grout-stopping wall 4 is set at the tunnel face of the surrounding rock 1 of the tunnel to be excavated. For example, the grout-stopping wall 4 can be cast with C30 concrete, with an upper width of 3m and a lower width of 3.5m, and a foundation burial depth of 1.6m. In this way, the structural strength of the surrounding rock 1 of the tunnel to be excavated can be ensured, which is conducive to avoiding deformation, collapse and other problems.
[0043] S4: A plurality of grouting pipes 5 are driven into the stop wall 4, and the grouting pipes 5 are extended into the surrounding rock 1 of the tunnel to be excavated by a second preset length. The second preset length is less than the first preset length. Thus, the structure of the surrounding rock 1 of the tunnel to be excavated within the second preset length can be consolidated by the grouting pipes 5, thereby avoiding the problems of damage, deformation or collapse of the rear initial support, damage to mechanical equipment, etc., and thus helping to improve the safety of construction personnel.
[0044] S5: Consolidating the surrounding rock 1 of the tunnel to be excavated by the grouting equipment 6.
[0045] According to the construction method of the extremely soft rock tunnel 100 of the embodiment of the present application, by setting drainage holes 3 on both sides of the tunnel 2 in the width direction, the water in the extremely soft rock can be discharged in advance through the drainage holes 3. At the same time, by setting a grouting wall 4 on the face of the surrounding rock 1 of the tunnel to be excavated, and driving a grouting pipe 5 into the grouting wall 4, the stability of the surrounding rock can be enhanced, the safety risk of extremely soft rock on-site construction can be effectively reduced, and the normal excavation of the effective section tunnel 2 can be ensured.
[0046] Please continue reading Figure 1-Figure 3In some embodiments, a drainage pipe 32 is provided on the drainage hole 3, and the water discharged from the drainage pipe 32 is discharged to the outside. The specific steps may include:
[0047] S21: A drainage ditch 31 is provided on the bottom wall of the drainage tunnel 3 , and the drainage ditch 31 is connected to the drainage groove 21 of the tunnel 2 .
[0048] The elevation of the bottom of the drainage ditch 31 is consistent with the elevation of the bottom of the drainage groove 21, which facilitates water discharge.
[0049] S22: a drainage pipe 32 is provided on the drainage hole 3, and the water discharged from the drainage pipe 32 flows into the drainage ditch 31. The water discharged from the drainage pipe 32 can be directly flowed into the drainage ditch 31 for collection, or can be assisted by other components, which is not limited in the present application.
[0050] Therefore, by providing the drainage ditch 31 communicated with the drainage groove 21, the drainage hole 3 can be directly drained, thereby reducing the difficulty of drainage of the drainage hole 3, and further facilitating the improvement of construction efficiency.
[0051] Please continue reading Figure 1-Figure 3 In some embodiments, a drainage pipe 32 is provided on the drainage hole 3, and the water discharged from the drainage pipe 32 flows into the drainage ditch 31. The specific steps may include:
[0052] S211: multiple advance drainage pipes 321 are arranged on the face of the drainage tunnel 3, so that the advance drainage pipes 321 extend along the axial direction of the drainage tunnel 3, and the water in the advance drainage pipes 321 flows into the drainage ditch 31. Thus, the water in the axial direction of the drainage tunnel 3 can be discharged.
[0053] Exemplarily, the extension length of the advance drain pipe 321 may be 20 m.
[0054] Please continue reading Figure 1-Figure 3 In some embodiments, a plurality of advance drainage pipes 321 are arranged on the tunnel face of the drainage tunnel 3, so that the advance drainage pipes 321 extend along the axial direction of the drainage tunnel 3, and the water in the advance drainage pipes 321 flows into the drainage ditch 31. The specific steps may include:
[0055] S2111: A plurality of advance drainage pipes 321 are arranged on the working face of the drainage tunnel 3 , so that the advance drainage pipes 321 extend along the axial direction of the drainage tunnel 3 .
[0056] S2112: A connecting pipe 322 is arranged in the drainage hole 3 so that the plurality of advanced drainage pipes 321 are connected to the drainage ditch 31 through the connecting pipe 322 .
[0057] Specifically, a plurality of water outlets may be provided in the axial direction of the advance drainage pipe 321 , and the water outlets are connected to the connecting pipe 322 . The connecting pipe 322 may collect water discharged from the plurality of advance drainage pipes 321 , and may directly discharge the collected water into the drainage ditch 31 .
[0058] This is beneficial to improving the drainage efficiency of the advance drain pipe 321, and at the same time, the structure is simple, which is also beneficial to reducing costs.
[0059] Please continue reading Figure 1-Figure 3 In some embodiments, a plurality of advanced drainage pipes 321 are arranged on the tunnel face of the drainage tunnel 3, and the advanced drainage pipes 321 are extended along the axial direction of the drainage tunnel 3. The specific steps include:
[0060] S21111: Wrap a filter screen outside the advance drain pipe 321;
[0061] S21112: Setting installation holes on the face of the drainage tunnel 3; illustratively, a geological drilling rig and a pipe may be used to form the holes.
[0062] S21113: The advanced drainage pipe 321 is penetrated through the installation hole so that the advanced drainage pipe 321 extends along the axial direction of the drainage hole 3. For example, after the hole is formed, a jack is used to push a φ50 steel flower pipe into the installation hole.
[0063] Please continue reading Figure 1-Figure 3 In some embodiments, a drainage pipe 32 is provided on the drainage hole 3, and the water discharged from the drainage pipe 32 flows into the drainage ditch 31. The specific steps include:
[0064] S211: a plurality of advance drainage pipes 321 are arranged on the tunnel face of the drainage tunnel 3, the advance drainage pipes 321 are extended along the axial direction of the drainage tunnel 3, and water in the advance drainage pipes 321 flows into the drainage ditch 31;
[0065] S212 : a plurality of radial drainage pipes 323 are arranged on the inner wall of the drainage hole 3 , so that the radial drainage pipes 323 extend along the radial direction of the drainage hole 3 .
[0066] In this way, water in the extremely soft rock can be discharged radially and axially, thereby better reducing the water level and formation water content in the extremely soft rock, which is beneficial to reducing the safety risks of on-site construction of extremely soft rock.
[0067] Please continue reading Figure 1-Figure 3 In some embodiments, a plurality of radial drainage pipes 323 are provided on the inner wall of the drainage hole 3, and the radial drainage pipes 323 are extended along the radial direction of the drainage hole 3, which specifically includes the following steps:
[0068] S2121: multiple drainage sections are arranged in the drainage hole 3, and the multiple drainage sections are arranged at intervals along a first spacing in the extension direction of the drainage hole 3; illustratively, the first spacing may be 5m, that is, a drainage section is arranged every 5m.
[0069] S2122: A plurality of radial drainage pipes 323 are arranged on the inner wall of the drainage section, so that the radial drainage pipes 323 extend along the radial direction of the drainage section.
[0070] Therefore, the water level in the extremely soft rock during the excavation of the drainage tunnel 3 can be lowered through multiple drainage sections, thereby avoiding safety risks during the excavation of the drainage tunnel 3 and also better reducing the safety risks of the tunnel 2 construction.
[0071] Please continue reading Figure 1-Figure 3 In some embodiments, drainage holes 3 connected to the tunnel 2 are provided on both sides of the surrounding rock 1 of the tunnel to be excavated in the width direction, and the drainage holes 3 are extended by a first preset length along the length direction of the tunnel 2. The specific steps include:
[0072] S11: A first drainage section 33 of a drainage hole 3 connected to the tunnel 2 is arranged on both sides of the surrounding rock 1 of the tunnel to be excavated in the width direction, and the distance between the free end of the first drainage section 33 and the tunnel 2 is set to a first preset distance; illustratively, the first preset distance may be 15 m.
[0073] S12: A second drainage section 34 of the drainage tunnel 3 connected to the first drainage section 33 is provided at the free end of the first drainage section 33, and the second drainage section 34 is extended from the tunnel face of the surrounding rock 1 of the tunnel to be excavated to a first preset length in the length direction of the tunnel 2. For example, the first preset length may be 30 m.
[0074] Thereby, the drainage effect of the drainage hole 3 can be ensured, so that the safety of the construction of the extremely soft rock tunnel 100 can be guaranteed.
[0075] Please continue reading Figure 1-Figure 3 In some embodiments, a plurality of grouting pipes 5 are driven into the grout-stopping wall 4, and the grouting pipes 5 are extended into the surrounding rock 1 of the tunnel to be excavated by a second preset length. The specific steps include:
[0076] S41: driving a plurality of grouting pipes 5 at different angles into the grout-stopping wall 4;
[0077] S42: driving the grouting pipe 5 into the surrounding rock 1 of the tunnel to be excavated by a second preset length. For example, the second preset length may be 18 to 27 m.
[0078] As a result, the surrounding rock 1 of the tunnel to be excavated can be better consolidated, thereby effectively reducing the safety risk of on-site construction of extremely soft rocks and ensuring the normal excavation of the effective section tunnel 2.
[0079] Please continue reading Figure 1-Figure 3 In some embodiments, the construction method of the extremely soft rock tunnel 100 further includes:
[0080] S6: excavating the surrounding rock 1 of the tunnel to be excavated by a third preset length; wherein the third preset length is smaller than the second preset length.
[0081] S7: Drain holes 3 connected to the tunnel 2 are set on both sides of the excavated tunnel 2, and the drain holes 3 are extended to a fourth preset length along the length direction of the tunnel 2; wherein the fourth preset length is greater than the second preset length and less than the first preset length.
[0082] Thereby, it is possible to avoid setting up the slurry stop wall 4 during the next excavation, and at the same time, the safety risk of on-site construction in extremely soft rock can be effectively reduced, thereby ensuring the normal excavation of the effective section tunnel 2.
[0083] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.
[0084] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A very soft rock tunnel construction method, characterized in that: The extremely soft rock tunnel construction method comprises: Discharging drainage holes connected to the tunnel on both sides of the surrounding rock of the tunnel to be excavated in the width direction, and extending the drainage holes by a first preset length along the length direction of the tunnel; A drainage pipe is arranged on the drainage hole, and the water discharged from the drainage pipe is discharged to the outside; Setting a grout stop wall on the tunnel face of the surrounding rock of the tunnel to be excavated; Driving a plurality of grouting pipes into the grout-stopping wall, and extending the grouting pipes into the surrounding rock of the tunnel to be excavated by a second preset length; The surrounding rock of the tunnel to be excavated is consolidated by grouting equipment; Wherein, the second preset length is smaller than the first preset length.
2. The extremely soft rock tunnel construction method according to claim 1, characterized in that: The specific steps of arranging a drainage pipe on the drainage hole and discharging the water discharged from the drainage pipe to the outside include: A drainage ditch is provided on the bottom wall of the drainage hole, and the drainage ditch is connected to the drainage groove of the tunnel; The drainage pipe is arranged on the drainage hole, and the water discharged from the drainage pipe flows into the drainage ditch.
3. The extremely soft rock tunnel construction method according to claim 2, characterized in that: The specific steps of arranging the drainage pipe on the drainage hole and allowing the water discharged from the drainage pipe to flow into the drainage ditch include: A plurality of advance drainage pipes are arranged on the tunnel face of the drainage tunnel, so that the advance drainage pipes extend along the axial direction of the drainage tunnel, and the water in the advance drainage pipes flows into the drainage ditch.
4. The extremely soft rock tunnel construction method according to claim 3, characterized in that: A plurality of advance drainage pipes are arranged on the tunnel face of the drainage tunnel, so that the advance drainage pipes extend along the axial direction of the drainage tunnel, and the water in the advance drainage pipes flows into the drainage ditch. The specific steps include: A plurality of advanced drainage pipes are arranged on the tunnel face of the drainage tunnel, so that the advanced drainage pipes extend along the axial direction of the drainage tunnel; A connecting pipe is arranged in the drainage hole, so that the plurality of advanced drainage pipes are connected with the drainage ditch through the connecting pipe.
5. The extremely soft rock tunnel construction method according to claim 4, characterized in that: The specific steps of arranging a plurality of advance drainage pipes on the tunnel face of the drainage tunnel so that the advance drainage pipes extend along the axial direction of the drainage tunnel include: Wrap a filter screen around the advance drain pipe; A mounting hole is provided on the face of the drainage hole; The advanced drainage pipe is passed through the installation hole so that the advanced drainage pipe extends along the axial direction of the drainage hole.
6. The extremely soft rock tunnel construction method according to claim 2, characterized in that: The specific steps of arranging the drainage pipe on the drainage hole and allowing the water discharged from the drainage pipe to flow into the drainage ditch include: A plurality of advance drainage pipes are arranged on the tunnel face of the drainage tunnel, so that the advance drainage pipes extend along the axial direction of the drainage tunnel, and the water in the advance drainage pipes flows into the drainage ditch; A plurality of radial drainage pipes are arranged on the inner wall of the drainage hole, so that the radial drainage pipes extend along the radial direction of the drainage hole.
7. The extremely soft rock tunnel construction method according to claim 6, characterized in that: Arranging a plurality of radial drainage pipes on the inner wall of the drainage hole so that the radial drainage pipes extend along the radial direction of the drainage hole specifically comprises the following steps: A plurality of drainage sections are arranged in the drainage hole, and the plurality of drainage sections are arranged at intervals along a first spacing in the extending direction of the drainage hole; A plurality of radial drainage pipes are arranged on the inner wall of the drainage section, so that the radial drainage pipes extend along the radial direction of the drainage section.
8. The extremely soft rock tunnel construction method according to claim 1, characterized in that: The steps of setting drainage holes connected to the tunnel on both sides of the surrounding rock of the tunnel to be excavated in the width direction and extending the drainage holes to a first preset length along the length direction of the tunnel include: A first drainage section of a drainage tunnel connected to the tunnel is arranged on both sides of the surrounding rock width direction of the tunnel to be excavated, and the distance between the free end of the first drainage section and the tunnel is set to a first preset distance; A second drainage section of the drainage tunnel connected to the first drainage section is arranged at the free end of the first drainage section, and the second drainage section is extended from the tunnel face of the surrounding rock of the tunnel to be excavated by a first preset length in the length direction of the tunnel.
9. The extremely soft rock tunnel construction method according to claim 1, characterized in that: The specific steps of driving a plurality of grouting pipes into the grout-stopping wall and extending the grouting pipes into the surrounding rock of the tunnel to be excavated by a second preset length include: A plurality of grouting pipes are driven into the grout-stopping wall at different angles; The grouting pipe is driven into the surrounding rock of the tunnel to be excavated to a second preset length.
10. The extremely soft rock tunnel construction method according to claim 1, characterized in that: The extremely soft rock tunnel construction method further comprises: Excavating the surrounding rock of the tunnel to be excavated by a third preset length; Discharging drainage holes connected to the tunnel on both sides of the excavated tunnel, and extending the drainage holes by a fourth preset length along the length direction of the tunnel; The fourth preset length is greater than the second preset length and less than the first preset length, and the third preset length is less than the second preset length.
Citation Information
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