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Artificial draining and pressure relief method for water-rich area outside tunnel

A technology for water-rich areas and tunnels, applied in drainage, earthwork drilling, mining equipment, etc., can solve problems such as geological disasters, difficult drainage of groundwater, etc., and achieve scientific and reasonable design, convenient construction and operation, and good effects Effect

Inactive Publication Date: 2018-10-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially during tunnel construction, tunnel excavation and tunnel curtain construction will cut off the original groundwater channel through the groundwater circulation cracks in the formation. Curtain grouting greatly improves the impermeability of the surrounding rock, making it more difficult for the groundwater in the formation to drain , in the case of sudden heavy rainfall, the rainfall infiltration water will accumulate continuously in the stratum, and it is difficult to discharge, and the water pressure generated will act on the tunnel support and surrounding rock for a long time, which will easily lead to the damage of the tunnel support structure, and even cause water gushing and mud outburst and other geological disasters
[0004] At present, in order to solve the above problems, groundwater can be drained by conducting drainage pipes to prevent potential threats to tunnel support. However, long-term dehydration will have adverse effects on the surrounding environment, and it is easy to cause drought in the higher ground, and the nearby groundwater level will be reduced. decline, etc., and the discharged groundwater generally cannot be used effectively, which will cause a waste of groundwater resources

Method used

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  • Artificial draining and pressure relief method for water-rich area outside tunnel

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Effect test

Embodiment 1

[0031] Such as Figure 1 to Figure 4 As shown, this embodiment provides an artificial drainage and pressure relief method for the water-rich area outside the tunnel. The method specifically includes the following steps:

[0032] Step 1. Detect the upper and lower large aqueducts or water-rich areas around the tunnel:

[0033] Transient electromagnetic method, high-density resistivity method, seismic imaging method and geological radar method are used to comprehensively detect the water content outside the tunnel in the water gushing section, and detect the main water-rich areas and water-rich cracks outside the tunnel in the water gushing section, and comprehensively analyze the main areas of groundwater passing through the tunnel. The integrity of the surrounding rock near the drainage pipeline area, the distribution of large underground aqueducts and water-rich areas;

[0034] In this step, the four methods of transient electromagnetic method, high-density resistivity metho...

Embodiment 2

[0043] An artificial drainage and pressure relief method for the water-rich area outside the tunnel. The operation steps of the method are as described in Embodiment 1, and the difference is that: before step 1, the construction preparation process is also included: understanding the geological conditions of the pressurized water injection section , including water pressure, degree of development of surrounding rock fissures, properties of fillings in fissures, and strength of tunnel support and grouting curtain. According to the above geological conditions, determine the range of water injection pressure that causes surrounding rock splitting, and set the water injection pressure accordingly. Pressure value.

Embodiment 3

[0045] An artificial drainage and pressure relief method for the water-rich area outside the tunnel. The operation steps of the method are as described in Example 1, and the difference is that in step 3, before the pipe is lowered, the steel pipe required for construction is first subjected to a water pressure test. , try to increase the water pressure to 1.2 times the set water injection pressure value, let it stand for 45 minutes, check whether there is any water leakage in the steel pipe, and repeat the water pressure test 3 times. Before lowering the pipe, inspect the high-pressure strength of the construction device and whether there is any water leakage to ensure the overall construction quality.

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Abstract

The invention relates to an artificial draining and pressure relief method for a water-rich area outside a tunnel. The artificial draining and pressure relief method comprises the following steps that1, upper and lower large water guide pipes or the water-rich area around the tunnel are detected; 2, rows of boreholes are designed; 3, drilling construction and pipe lowering are carried out; and 4,water is pressurized for fracturing. The artificial draining and pressure relief method is applicable to the engineering situation that the underground water level of a stratum changes greatly due tolarger rainfall fluctuation, and curtain grouting is adopted around the tunnel to block the water, no or few drainage holes exist. By adopting the artificial draining and pressure relief method, therapid drainage of rainfall infiltration water can be effectively realized, the underground water level is prevented from maintaining a high water level for a long time and enabling the tunnel supportto be subjected to high pressure, and the problem that the support is damaged due to the surge of the underground water level caused by heavy rainfall such as heavy rain is solved. The artificial draining and pressure relief method is scientific and reasonable in design, convenient to construct and operate, has good use effect and is worthy of popularization and application.

Description

technical field [0001] The invention relates to an artificial drainage and pressure relief method for a water-rich area outside a tunnel, which is mainly applied to tunnels built in strata where the groundwater level is greatly affected by heavy rainfall, and belongs to the technical field of tunnel excavation. Background technique [0002] With the continuous development of tunnel engineering, there are more and more cases of unfavorable geology encountered in the process of tunnel construction. Affected by complex geological structural conditions and topographic and geomorphic factors, tunnel construction in my country often passes through strata with poor geological conditions. Under the comprehensive action of groundwater, ground stress and the looseness and fragmentation of the surrounding rock of the tunnel, engineering disasters and problems such as tunnel collapse, water gushing and mud gushing, and support cracking are prone to occur during the construction process....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F16/02
CPCE21F16/02
Inventor 张霄段崇豪张庆松李相辉安琪祎郝彭帅王子昂尹占超刘啸
Owner SHANDONG UNIV
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