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

Abstract

The embodiment of the invention provides a construction control method for horizontal extrusion large deformation of a suture zone soft rock single track railway tunnel. The construction control method comprises the following steps: performing ground stress test and rock compressive strength test on a suture zone tunnel construction stage, and obtaining a primary stress stack value sigma max and rock compressive strength sigma s in a direction perpendicular to the tunnel; calculating a construction stage surrounding rock strength-stress ratio sigma s / sigma max; performing large deformation grade judgment on the construction stage according to the construction stage surrounding rock strength-stress ratio sigma s / sigma max; and while the large deformation grade reaches slight-medium large deformation standards, performing the following constructions: tunnel excavation outline surface change, short step excavation construction by tunnel excavation outline surface change, broken-rock zonerange step-by-step test at different stages, system anchor rod length and reinforcing system anchor rod length determination according to the tested results of a broken rock zone, and construction ona system anchor rod and a reinforcing system anchor, and tunnel inverted arch 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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