Construction method of residual slope wash tunnel with shallow cover and unsymmetrical pressure

Abstract

The invention relates to a construction method of a residual slope wash tunnel with a shallow cover and the unsymmetrical pressure. The scheme with the step of ground surface grouting and shotcrete anchorage combined supporting, the step of pre-reinforcement of a long pipe shed and the step of correction three-stair four-step excavation construction is adopted, construction is conducted layer by layer from outside to inside, and operation that the deep-cover unsymmetrical pressure side is excavated, supporting is conducted, then the shallow-cover unsymmetrical pressure side is constructed, and an asymmetrical initial supporting structure is used for conducting construction according to the unsymmetrical pressure of surrounding rock is conducted, so that the supporting structure is optimized, the working procedure is more reasonable, and the construction speed is increased.

Description

technical field [0001] The invention relates to a construction method of a shallow-buried bias-pressure residual slope soil tunnel. Background technique [0002] The soil quality of residual slope accumulation tunnels is characterized by large porosity, low strength, and high compressibility. It is easy to collapse, which is quite unfavorable for tunnel body excavation, tunnel waterproofing, and zero settlement control. The direct vertical load of the jacking soil and the lateral unbalanced horizontal pressure act together, and the influence of the uneven distribution of ground stress makes the analysis of soil stability very difficult. In the process of entering the hole, the force balance of the original soil must be destroyed system, adopt effective, operable and reasonable technical measures to rebalance the stress system of the soil during construction, otherwise it will cause geological disasters such as distortion and collapse of the excavation surface, making the saf...

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Problems solved by technology

[0002] The soil quality of residual slope accumulation tunnels is characterized by large porosity, low strength, and high compressibility. It is easy to collapse, which is quite unfavorable for tunnel body excavation, tunnel waterproofing, and zero settlement control. The direct vertical load of the jacking soil and the lateral unbalanced horizontal pressure act together, and the influence of the uneven distribution of ground stress makes the analysis of soil stability very difficult. In the process of entering the hole, the force balance of the original soil must be destroyed system, adopt effective, operable and reasonable technical measures to rebalance the stress system of the soil during construction, otherwise it will cause geological disasters such as distortion and collapse of the excavation surface, making the safety of the tunneling work and construction equipment personnel unsafe. Guaranteed

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