Active tunnel prevention and control method based on construction of guide tunnel

Abstract

The invention discloses an active tunnel prevention and control method based on construction of a guide tunnel. The method is based on the construction of the guide tunnel and comprises the steps of loosening rock in a layered fracture zone formed by excavation of the guide tunnel and filling the rock with a flexible material to improve the internal loosening degree of the rock in order to improvethe stress elimination capability of the layered fracture zone, greatly weaken or block the ground stress and the seismic wave strength, and protect the safety and stability of a main tunnel. A pressure box in a partition fracture zone can monitor the pressure in the partition fracture zone in real time, and when the pressure is identical to the ground stress transmitted from the partition fracture zone, it is indicated that the internal stress of the partition fracture zone is saturated; at the moment, the fractured rock in the partition fracture zone is crushed and sucked again and filled with the flexible material, the interior of the partition fracture zone is kept soft all the time, and the partition fracture zone can play a role of forming a stress barrier for a long time, so that the safety and stability of the main tunnel is guaranteed for a long time.

Description

technical field [0001] The invention relates to an active tunnel prevention and control method based on a construction pilot tunnel, which is suitable for the application range of tunnel excavation engineering. Background technique [0002] With the continuous development of hydropower engineering and underground engineering, tunnel construction is developing in the direction of large span and large buried depth, especially in deep buried tunnels in alpine and canyon areas, where the geological structure is complex, the ground stress level is high, and the ground temperature is high. The risk of geological disasters such as water gushing and water gushing has further increased, among which rockburst disasters in high ground stress areas are particularly prominent. During the construction process, the occurrence of these disasters is unpredictable, seriously threatening the safety of operators and construction equipment, and restricting the construction progress. [0003] At...

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Problems solved by technology

Engineering practice has proved that these methods have a certain effect on the prevention and control of disasters with low intensity levels, but the above methods greatly increase the amount of work, consume too much manpower and material resources, affect the construction progress, and sometimes it is difficult to achieve satisfactory results. The process is very dangerous and has proven to be reactive, negative and non-curative

[0004] Existing active prevention and control measures for tunnels, there are also methods of using stress relief in advance, such as patents "CN107165638A, CN104482718A", etc. Although the stress relief method is used to maintain the stability and safety of the tunnel, drill and blast excavation is mostly used, and the blasting energy of explosives is used to set the stress relief. Although these methods can achieve a certain effect, the stress relief range is small, the construction volume is large, and it is difficult to ensure the safety of construction personnel and the stability of surrounding rock

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