Construction method for sealing karst cave near trench wall of underground continuous wall in karst stratum

Abstract

The invention provides a construction method for sealing a karst cave near a trench wall of an underground continuous wall in a karst stratum, comprising the steps of firstly, surveying the situation of the karst cave; secondly, pumping and discharging karst water; thirdly, implementing primary filling in the karst cave; fourthly, implementing primary double-slurry grouting for reinforcement; fifthly, implementing secondary filling and secondary double-slurry grouting for reinforcement; sixthly, after completely implementing cement-sodium silicate double-slurry grouting and sealing the whole boundary, implementing compaction grouting by adopting cement slurry till reaching a technical standard of grouting stop; seventhly, after finishing grouting and pulling out a grouting pipe, sealing holes with cement mortar M7.5#, wherein the completion of hole sealing means the completion of sealing the karst cave on the periphery of the grouting holes; eighthly, inspecting a karst cave treatment effect. According to the construction method for sealing the karst cave near the trench wall of the underground continuous wall in the karst stratum, the cement slurry consumption can be lowered, the setting time of the cement-sodium silicate slurry is shortened, the construction efficiency is improved, the surrounding environment is protected, the strength of a grouted condensed slurry body is guaranteed, and the safe implementation of a project is assured.

Description

technical field [0001] The invention relates to a construction method in the technical field of construction engineering, in particular to a construction method for sealing a karst cave near the groove wall of an underground diaphragm wall in a karst formation. Background technique [0002] Generally, during the construction of the underground diaphragm wall, mud is needed to protect the wall to prevent the tank wall from collapsing. However, when the underground diaphragm wall is constructed in the limestone karst area, the retaining wall mud and concrete used for groove formation are often lost due to the existence of underground caves nearby. This not only causes a large amount of waste of engineering materials, but also affects the quality of the groove wall of the underground diaphragm wall. In order to make the bearing capacity and deformation of the underground diaphragm wall meet the requirements, the karst caverns around it must be closed and reinforced, and the fu...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a construction method for closing the karst caves near the groove wall of the underground diaphragm wall in the karst formation, so as to overcome the lack of theoretical basis for grouting ratio in the prior art, resulting in a large amount of mud and concrete for retaining walls Waste, polluting the surrounding environment and other major defects, and there are karst geological problems in the area near the underground diaphragm wall

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