Construction control method for horizontal extrusion and large deformation of soft rock single-track railway tunnel in suture zone

Abstract

An embodiment of the present invention provides a construction control method for horizontal extrusion and large deformation of a soft rock single-track railway tunnel in a suture zone, which includes: performing an in-situ stress test and a rock mass compressive strength test at the construction section of the suture zone tunnel to obtain the orientation of the vertical tunnel The principal stress superposition value σ max and rock mass compressive strength σ s ; Calculate the strength-stress ratio of the surrounding rock in the construction section σ s / σ max ; According to the strength-stress ratio of the surrounding rock in the construction section σ s / σ max , determine the large deformation level of the construction section; when the large deformation level reaches the standard of slight to medium large deformation, continue the following construction; change the tunnel excavation contour surface; use the changed tunnel excavation contour surface to carry out short step excavation Excavation construction, test the range of loose circles in different stages step by step; according to the test results of the loose circle, determine the length of the system anchor and the length of the reinforcement system anchor, so as to carry out the construction of the system anchor and the reinforcement system anchor; carry out the tunnel Invert construction.

Description

technical field [0001] The invention relates to the field of construction, in particular to a construction control method for large deformation of horizontal extrusion of soft rock single-track railway tunnels in suture zones. Background technique [0002] The plate suture zone refers to the part where different continents or island arcs collide and connect during plate movement. Due to the geographical location of the plate boundary geological bodies connected by the suture zone was far apart, affected by the reciprocating tectonic effects such as subduction and exhumation in the process of long-term crustal movement convergence, it usually shows that the rock mineral components are complex, the rock mass structure is variable, and the geological There are complex structural features such as high pressure, high strain, and high stress in the body. The Indochina Peninsula, which belongs to the Indochina continental block region, is a complex geological structure composed of...

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Problems solved by technology

[0004] At this stage, with the gradual implementation of the construction plan of the Trans-Asian Railway transportation network, the safe and rapid construction of the long and large railway tunnels in the Indochina land mass in the Indochina Peninsula has become the key task of the construction project. Unlike the geological structure of a single continent, it is composed of multiple groups of land parcels The collision zone between them and the composite continent formed by the long-term evolution of orogenic assemblages, the line spans multiple sets of suture zones, resulting in extremely complex regional original structural stress fields, coupled with the backward economy of some countries, lack of construction resources and geological data, the international Insufficient relevant theoretical support and lack of construction experience lead to severe deformation, invasion and limit damage of many arched side walls during tunnel construction

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