Construction method for tunnel passing through clastic rock steep inclination thrust water-rich fault

Abstract

The invention discloses a construction method for a tunnel passing through a clastic rock steep inclination thrust water-rich fault, which comprises the following steps of: 1, performing preliminary excavation construction on a rear tunnel section and performing construction on a rear high-position escape channel section; 2, synchronously performing excavation and construction on the tunnel section at the rear side and the drainage tunnel body of a drainage tunnel, and performing construction on the high-position escape channel section at the middle part and a emergency escape system of an auxiliary tunnel; 3, synchronously performing excavation and construction on the tunnel section at the rear side, the drainage tunnel body of the drainage tunnel and a detour guide pit section at the rear side, and constructing the high-position escape channel section at the front side and the emergency escape system of the auxiliary tunnel; 4, synchronously constructing the front drainage tunnel body, the detour guide pit and the tunnel front tunnel and carrying out follow-up construction on the front high-position escape channel segment and the auxiliary tunnel emergency escape system; 5, excavating and constructing the front tunnel section. According to the invention, the high-level drainage tunnel is arranged between the tunnel front tunnel and the detour guide pit, a high-level escape platform is arranged in the tunnel front tunnel, and the auxiliary tunnel emergency escape system is arranged in each auxiliary pit, so that the construction safety is ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for a tunnel passing through a steep clastic rock thrust and water-rich fault. Background technique [0002] The fault zone refers to the zone composed of the main fault plane and the broken rock blocks on both sides, as well as several secondary faults or rupture surfaces. In China, a high-angle thrust fault with a dip angle greater than 45° or 30° is called a thrust fault, and it is more difficult to construct a tunnel that crosses a steep thrust fault with a dip angle greater than 60°. Thrust faults greater than 60°. Clastic rock refers to the rock formed by the transport, deposition, compaction and cementation of minerals and rock debris produced by mechanical weathering of the parent rock; its components include matrix and cement in addition to clastic particles. Tunnel construction in clastic rock strata is difficult, especial...

AI Technical Summary

Problems solved by technology

Tunnel construction in clastic rock strata is difficult, especially when the stratum is a water-rich stratum rich in groundwater. Rock mass fragmentation provides more favorable conditions for the occurrence and enrichment of groundwater, and the construction is very difficult. Large, water gushing and sand gushing are very likely to occur during construction. In addition, the inclination angle of the fault section is greater than 60°, which can easily cause catastrophic consequences and seriously affect the safety and efficiency of construction.

Therefore, when constructing tunnels that cross steeply inclined thrust water-rich faults in clastic rocks, the construction risks are very high. For steep thrust faults in the strata, when the clastic rocks are excavated to the steep thrust water-rich faults, the face of the face is prone to sudden water and sand gushes, and because the clastic rocks are steeply inclined, the water-rich faults are fragmented. The clastic rock is rich in groundwater, and under the action of high water pressure, it is more likely to form geological disasters such as water gushing and sand gushing. The construction risk is high, the construction is difficult and the construction progress is slow

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