Construction method for top arch of underground powerhouse under surrounding rock condition of extrusion fracture zone

Abstract

The invention discloses a construction method for a top arch of an underground powerhouse under the surrounding rock condition of the extrusion fracture zone, which aims to solve the problems that the underground powerhouse surrounding rock condition under the extrusion fracture zone surrounding rock condition in a high seismic intensity area is poor, and the stability of the underground powerhouse surrounding rock is difficult to guarantee if the underground powerhouse is directly excavated. According to the construction method, consolidation grouting is carried out on the top arch of the underground powerhouse, a certain pressure is applied to a certain proportion of cement paste, the cement paste is pressed into rock cracks through drill holes, and a consolidated body with certain strength and impermeability is formed through cementation hardening of the cement paste, so that the strength of the surrounding rock is improved, and meanwhile the integrity and impermeability of the surrounding rock are improved; and through the grouting effect, a corresponding excavation method is adopted, the safety risk level of subsequent excavation of the underground powerhouse is reduced, and meanwhile, the personal safety and the construction progress of subsequent excavation supporting are guaranteed.

Description

technical field [0001] The invention relates to the technical field of roof arch construction of underground powerhouses, in particular to a construction method for roof arches of underground powerhouses under the condition of surrounding rocks in crushed and broken zones. Background technique [0002] At present, the location of the power station belongs to the high seismic intensity area, and at the same time, affected by the fault zone, the surrounding rock conditions are not good. The surrounding rock conditions of the underground powerhouse are mainly Class Ⅳ surrounding rock. [0003] Due to the poor geological conditions of the underground powerhouse, the stability of the surrounding rock of the roof arch of the powerhouse is poor, and there is no safety guarantee for the excavation of the powerhouse. Contents of the invention [0004] The purpose of the present invention is to provide a construction method for the roof arch of an underground powerhouse under the co...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for the roof arch of an underground powerhouse under the condition of surrounding rock in a crushed and broken zone, aiming to solve the problem of poor stabili

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