Construction method for fault fracture zone surrounding rock tunnel

Abstract

The invention discloses a tunnel construction method in a fault fracture zone, which comprises the following steps: a. adopting the method of combining geophysical prospecting and drilling and combining long-distance and short-distance to ascertain the geological situation in front, and carry out advanced geological prediction; b. adopting advanced Anchor construction, pre-grouting construction of the surrounding walls of small conduits in advance, and advance support construction of grouting pipe shed and steel frame, and advance pre-support; c. Tunnel excavation and support. It provides a theoretical basis for detecting the specific location, range and water inflow of the fault fracture zone; ensures the safety of tunnel construction; on the basis of analyzing the specific location and scope of the fault fracture zone and adopting a reasonable advanced pre-support method, comprehensive and specific According to the geological conditions, choose a reasonable tunnel excavation method. It has strong applicability for the construction of expressway tunnels crossing fault fracture zones; at the same time, it has reference and reference significance for the construction of railway, municipal and water conservancy tunnels (holes) with similar geological conditions.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a tunnel construction method in a fault fracture zone. Background technique [0002] Due to the strong geological tectonic movement, the dislocation, extrusion, torsion, and wrinkling of the strata occurred, which destroyed the continuity of the rock mass, reduced the scale of the rock block, and formed a fault fracture zone. The characteristics of broken strata are: loose structure, weak cementation, poor stability, easy to collapse during construction, and even worse if there is groundwater. [0003] During the excavation process of the tunnel, the stability of the surrounding rock in the fault fracture zone is poor, which is one of the key issues that need to be considered during the tunnel construction process. The self-stabilization time of the surrounding rock in the fault fracture zone is short, and accidents such as collapse and roof fall often occur. Therefore, the stabi...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method that can solve the problem of tunnel excavation in the existing fault fracture zone, which easily leads to tunnel collapse; when the buried depth of the tunnel is relatively shallow, it is difficult to form a load-bearing arch during excavation, and the subsidence and deformation of the ground surface may directly reach the ground surface. Construction Method of Surrounding Rock Tunnel in Fault Fractured Zone with Technical Problems

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