A soft rock tunnel portal slope reinforcing structure

Abstract

The application relates to the technical field of slope reinforcement engineering, and discloses a soft rock tunnel portal slope reinforcement structure, which comprises a slope body, a drill hole, a stress monitoring assembly, a steel mesh, a fixing rod, a perforation, a vertical rod, a fixing plate, a bolt, a pipeline and a capillary flow guide pipe. The application can effectively reinforce and support the slope surface, and can guide the rainwater infiltrated into the slope body to a position far away from the slope surface, so that the softening of the slope surface by the rainwater is reduced, and the slope stability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slope reinforcement engineering, more particularly, it relates to a soft rock tunnel portal slope reinforcement structure. BACKGROUND

[0002] With the continuous development of slope engineering, the stability problem of soft rock slope is increasingly prominent. Especially for the soft rock tunnel portal slope, due to the unique physical and chemical properties of soft rock, it is extremely sensitive to environmental factors such as temperature, humidity, stress and groundwater, and it is easy to soften and disintegrate when encountering water, which leads to slope instability and tunnel portal collapse. Moreover, if temporary support is not provided in time after the soft rock slope is excavated, and signs of landslide, collapse and other signs are found, the method of driving fixed piles and erecting steel pipe frames is used for support, which is time-consuming and laborious; in addition, the soft rock slope is excavated, and the precipitation during construction will have a great impact on the stability of the slope.

[0003] The existing soft rock tunnel slope reinforcement structure only reinforces and supports the surface of the slope, the reinforcement method is simple, cannot prevent the internal instability of the slope due to rainwater infiltration, and cannot monitor the stability of the slope.

[0004] Therefore, it is urgent to design a soft rock tunnel portal slope reinforcement structure to solve the above technical problems. SUMMARY

[0005] In order to overcome the above-mentioned defects in the prior art, the present application provides a soft rock tunnel portal slope reinforcement structure, which can effectively reinforce and support the surface of the slope, and can guide part of the rainwater infiltrated into the slope body to a position away from the surface of the slope, thereby reducing the softening of the slope surface by rainwater and enhancing the stability of the slope.

[0006] The above technical purpose of the present application is realized by the following technical scheme: a soft rock tunnel portal slope reinforcement structure, comprising a slope body, characterized in that the slope body is provided with a plurality of drill holes, a stress monitoring assembly is arranged in the drill hole, a steel mesh is arranged on the slope body, the steel mesh is provided with a plurality of fixed rods inserted into the slope body, the fixed rods are arranged horizontally, one end of the fixed rod inserted into the slope body is provided with a perforation, a vertical rod is arranged on the top of the slope body and inserted into the slope body, the perforation is provided for the vertical rod to pass through, a fixed plate is arranged on the top of the vertical rod, and a bolt is arranged between the fixed plate and the slope body; a flow guide device is arranged on the top of the slope body and inserted into the slope body, the flow guide device comprises a pipeline and a plurality of capillary flow guide pipes arranged on both sides of the pipeline, and the capillary flow guide pipes are arranged downwardly and obliquely from outside the slope body to inside the slope body.

[0007] By adopting the technical scheme, the position and depth of the drill hole are selected by the geological structure and the geotechnical mechanics, and the stress monitoring assembly can monitor the stress change of the rock in the slope body.

[0008] Further, the stress monitoring assembly comprises a steel strand and a multifunctional sensor arranged on the steel strand, and two ends of the steel strand are fixed to the hole bottom and the hole mouth of the drill hole respectively.

[0009] By adopting the technical scheme, one or more steel strands are anchored at the hole bottom and the hole mouth of the drill hole at each selected position to form a comprehensive monitoring network, when the stress of the rock at the hole bottom changes, the stress of the steel strand changes, the multifunctional sensor uploads the stress data of the steel strand to the monitoring center, and actively warns when reaching the warning value, so that certain protective measures are taken.

[0010] Further, the side of the steel mesh away from the slope body is provided with a concrete layer.

[0011] By adopting the technical scheme, the surface of the steel mesh is poured with a layer of concrete, which can effectively reinforce and support the slope surface.

[0012] Further, the top of the slope body is provided with a rain gauge.

[0013] By adopting the technical scheme, long-term rainfall and other natural factors will increase the amount of water infiltrated into the slope, affecting the stability of the slope, and the rain gauge can monitor the rainfall of the slope, and actively warn when the rainfall reaches the warning value.

[0014] Further, the top of the slope body is provided with a water interception ditch.

[0015] By adopting the technical scheme, the water interception ditch can intercept rainwater to reduce the rainwater infiltrated into the slope.

[0016] Further, the slope body is provided with a retaining wall at the slope bottom, and the bottom end of the side of the retaining wall facing the slope body is provided with a soil pressure gauge.

[0017] By adopting the technical scheme, the retaining wall can prevent rockfall and rainwater from splashing, and the soil pressure gauge can monitor the pressure of the slope on the retaining wall, and give a warning when the pressure value reaches the warning value.

[0018] In summary, the present invention has the following beneficial effects: the present invention can effectively reinforce and support the slope surface, and can divert some of the rainwater that has seeped into the slope body, diverting some of the rainwater away from the slope surface, reducing the softening of the slope surface by rainwater, thereby enhancing the slope stability; through real-time monitoring and early warning of rainfall, changes in slope internal stress, and changes in pressure on the retaining wall, if the warning value is reached, effective and targeted measures can be taken in a timely manner to enhance the slope stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a soft rock tunnel entrance slope reinforcement structure according to an embodiment of the present invention;

[0020] In the diagram: 1. Slope body; 2. Drill hole; 3. Reinforcing mesh; 4. Fixing rod; 5. Perforation; 6. Vertical rod; 7. Fixing plate; 8. Bolt; 9. Pipe; 10. Capillary tube; 11. Steel strand; 12. Concrete layer; 13. Rain gauge; 14. Interception ditch; 15. Retaining wall; 16. Earth pressure gauge. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0022] Example: Figure 1 As shown, a slope reinforcement structure for a soft rock tunnel entrance includes a slope body 1. The slope body 1 has multiple boreholes 2 drilled on its inclined surface. The location of the boreholes 2 is determined by the geological structure at that location. A stress monitoring component is installed inside each borehole 2. The stress monitoring component includes a steel strand 11 and a multi-functional sensor mounted on the steel strand 11. The multi-functional sensor can monitor changes in the stress on the steel strand 11. The two ends of the steel strand 11 are anchored to the bottom and opening of the borehole 2, respectively. A reinforcing mesh 3 is installed on the inclined surface of the slope body 1. The reinforcing mesh 3 is made of 8mm diameter steel bars bound into a rectangular mesh, with dimensions of 300mm long × 300mm wide. mm, the side of the steel mesh 3 facing away from the slope body 1 is filled with a concrete layer 12. After the concrete is poured, it needs to be compacted and the concrete layer 12 is watered in small amounts multiple times to prevent the concrete from cracking. The steel mesh 3 is equipped with multiple fixing rods 4 inserted into the slope body 1. The fixing rods 4 are set horizontally and have a through hole 5 at one end inserted into the slope body 1. The top of the slope body 1 is equipped with a vertical rod 6 inserted into the slope body 1. The through hole 5 allows the vertical rod 6 to pass through. The vertical rod 6 passes through the through hole 5 of the multiple fixing rods 4 to achieve a fixing effect, which can effectively fix the fixing rods 4 and prevent the slope surface from landslide.

[0023] The top of the vertical rod 6 is provided with a fixed plate 7, which is fixedly connected with the slope body 1 through a bolt 8, and the vertical rod 6 is fixed to the top of the slope through the fixed plate 7 and the bolt 8; the top of the slope body 1 is provided with a rain gauge 13, which can monitor the rainfall in real time; the top of the slope body 1 is provided with a water intercepting ditch 14, which can reduce the rainwater passing through the surface of the slope; the top of the slope body 1 is provided with a flow guide device inserted into the slope body 1, which comprises a pipeline 9 and a plurality of capillary flow guide pipes 10 arranged on both sides of the pipeline 9; the capillary flow guide pipes 10 on both sides are uniformly distributed along the length direction of the pipeline 9 at equal intervals; the capillary flow guide pipes 10 are arranged downwardly and obliquely from the outside of the slope body 1 to the inside of the slope body 1, which can guide the rainwater in the slope, reduce the rainwater infiltration to the end close to the surface of the slope, thereby reducing the softening effect of water on the soft rock in the slope, enhancing the stability of the slope; the bottom of the slope body 1 is provided with a retaining wall 15, which can prevent the rolling and splashing of the falling stones and rainwater above; the bottom end of the surface of the retaining wall 15 facing the slope body 1 is provided with a soil pressure gauge, which can monitor and early warn the rock pressure at the bottom of the slope.

[0024] The specific embodiment is only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiment without creative contribution according to the needs after reading the specification, as long as the modifications are within the scope of the claims of the present application and are protected by the patent law.

Claims

1. A soft rock tunnel portal slope reinforcement structure comprising a slope body (1), characterized in that, The slope body (1) is provided with a plurality of drill holes (2), and a stress monitoring assembly is arranged in the drill holes (2); the slope body (1) is provided with a steel mesh (3), the steel mesh (3) is provided with a plurality of fixed rods (4) inserted into the slope body (1), the fixed rods (4) are arranged horizontally, one end of the fixed rods (4) inserted into the slope body (1) is provided with a perforation (5), the top of the slope body (1) is provided with a vertical rod (6) inserted into the slope body (1), the perforation (5) is provided for the vertical rod (6), the top of the vertical rod (6) is provided with a fixed plate (7), and the fixed plate (7) is provided with a bolt (8) between the fixed plate (7) and the slope body (1); the top of the slope body (1) is provided with a flow guide device inserted into the slope body (1), the flow guide device comprises a pipeline (9) and a plurality of capillary flow guide pipes (10) arranged on both sides of the pipeline (9), and the capillary flow guide pipes (10) are arranged downwardly and obliquely from the outside of the slope body (1) to the inside of the slope body (1). The stress monitoring assembly comprises a steel strand (11) and a multifunctional sensor arranged on the steel strand (11), and both ends of the steel strand (11) are fixed to the hole bottom and the hole opening of the drill hole (2) respectively.

2. The soft rock tunnel portal slope reinforcing structure according to claim 1, characterized in that, The steel mesh (3) is provided with a concrete layer (12) on the side away from the slope body (1).

3. The soft rock tunnel portal slope reinforcing structure according to claim 1, characterized in that, The top of the slope body (1) is provided with a rain gauge (13).

4. The soft rock tunnel portal slope reinforcing structure according to claim 1, characterized in that, The top of the slope body (1) is provided with a water interception ditch (14).

5. The soft rock tunnel portal slope reinforcing structure according to claim 1, characterized in that, The slope bottom of the slope body (1) is provided with a retaining wall (15), and the bottom end of the side of the retaining wall (15) facing the slope body (1) is provided with a soil pressure gauge.

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