Tunnel excavation construction process in water-dispersible extremely soft rock stratum

Abstract

The invention discloses a tunnel excavation construction process in a water-dispersible extremely soft rock stratum, and relates to the technical field of underground space of geotechnical engineering. The tunnel excavation construction process in the water-dispersible extremely soft rock stratum specifically comprises a steel mesh, an advanced small pipe, system anchor rods, feet-lock bolts, outer concrete and an inner concrete lining. According to the tunnel excavation construction process in the water-dispersible extremely soft rock stratum, a cantilever roadheader is adopted to excavate atunnel rock mass so as to prevent the adverse influence of blasting vibration on the rock mass, the tunnel excavation construction process in the water-dispersible extremely soft rock stratum has thecharacteristics of high safety, good economy, simple equipment, small disturbance and high work efficiency and can be better applied to the soft rock stratum, an anchoring agent is taken as the grouting slurry of the advanced small pipe and the system anchor rods, the tunnel rock mass can be prevented from softening in water, the probability of rock mass disintegration is effectively reduced, thereliability and safety of the tunnel excavation construction are improved, and the situation that instability of the rock mass is prone to being caused due to the fact that existing tunnel excavationconstruction technology usually uses cement slurry for grouting and a tunnel is constructed by a drilling and blasting method is solved.

Description

technical field [0001] The invention relates to the technical field of underground space of geotechnical engineering, in particular to a construction technique for excavating tunnels in extremely soft rock formations that disintegrate in water. Background technique [0002] More and more engineering projects are going abroad. The geological conditions of different regions abroad are quite different from those in China, and the requirements for lining support for tunnel engineering are also different. [0003] The weak surrounding rock with water disintegration characteristics is rarely seen in domestic tunnel projects. Therefore, cement slurry is usually used for grouting of small advanced conduits and system bolts. Tunnels are usually constructed by drilling and blasting method. influences. [0004] The lithology of some foreign regions is extremely special. The mudstone and argillaceous sandstone contain montmorillonite, kaolinite and other components. The stability of th...

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Problems solved by technology

[0003] Weak surrounding rocks with water disintegration characteristics are rarely seen in domestic tunnel projects. Therefore, cement grout is usually used for the advanced small conduits and system anchors. Tunnels are usually constructed by drilling and blasting, and blasting vibration is detrimental to the stability of rock mass. influences

[0004] The lithology in some foreign regions is very special. The mudstone and argillaceous sandstone contain montmorillonite, kaolinite and other components. The experience and calculation theory cannot fully adapt to the local conditions, especially in the initial support of the tunnel, it is difficult to implement smoothly according to the experience of tunnel design and construction in soft soil areas in China

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