Earth surface monitoring method for shallow-buried underneath passing of a soft rock large deformation section tunnel through earth surface building

Abstract

The invention relates to the technical field of tunnel construction, in particular to an earth surface monitoring method for shallow-buried underneath passing of a soft rock large deformation section tunnel through an earth surface building. The method comprises the steps of observing in a hole and observing outside the hole, wherein observation in the hole comprises excavation surface observation and operated section observation, and observation outside the hole comprises observation of the ground building; measuring ground surface settlement and building settlement; arranging ground surface settlement observation points before tunnel excavation; enabling the distance from the tunnel center line to the farthest ground surface settlement observation point to greater than or equal to the sum of the tunnel burial depth and the tunnel excavation width; performing crown settlement measurement and convergence measurement; determining section spacing according to the surrounding rock level; and performing point distribution according to an excavation method, enabling the distribution height to be larger than each step, enabling a measuring point reflector plate to be aligned with the direction of a hole, and enabling measuring points to be exposed out of a primary support face. Through reasonable section arrangement, ground surface monitoring and ground surface building monitoring are added, so that monitoring data are more accurate and reliable, and the purposes of controlling settlement and accelerating construction are achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for monitoring the surface of a shallow-buried soft-rock large-deformation section tunnel penetrating the surface of a building. Background technique [0002] The Xigeda stratum is soft and prone to weathering. It will disintegrate when it encounters water, has poor water stability, and has many steep joints. The roof and wall of the cave often fall off, and then collapse or even collapse. top case. [0003] During tunnel excavation, the rock mass is disturbed, the balance of the rock mass is broken, and the internal force is redistributed, resulting in elastic-plastic deformation, compression, and creep. After the surrounding rock moves, it will extend to the lower part of the existing building foundation on the surface, and It is transmitted from the foundation to the building, thereby causing secondary internal force and deformation of the existing buildi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for monitoring the surface of a tunnel with a large deformation section of soft rock that is shallowly buried and penetrates the surface of the building in order to solve the problem that the existing technology cannot accurately grasp the force of the extension body around the tunnel.

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