Construction method of deep foundation pit supporting anti-seepage system of coastal karst stratum

Abstract

The invention discloses a construction method of a deep foundation pit supporting anti-seepage system of a coastal karst stratum. The deep foundation pit supporting anti-seepage system of the coastalkarst stratum comprises a supporting structure, a karst cave treatment structure and a horizontal waterproof curtain. According to the karst cave treatment measure, the risk that the karst cave develops rapidly under the action of underground water can be prevented, the risk that a supporting structure collapses during construction and a foundation pit suddenly surges under the action of high-water-head karst confined water is avoided, and the karst local collapse resistance of the foundation is improved. The drilling secant pile and inner support combined supporting system is good in supporting effect and small in deformation capacity of the supporting structure, waterproof measures such as a waterproof curtain do not need to be additionally taken, and the situation of water seepage rarely occurs to the side wall of the foundation pit. According to the horizontal waterproof curtain, the bottom area of the foundation pit is subjected to waterproof treatment in a grouting mode, an effective channel of karst fissure water at the pit bottom can be effectively cut off, and the problem of water burst at the pit bottom is thoroughly solved.

Description

technical field [0001] The invention relates to the technical field of foundation pit engineering, in particular to a construction method for a deep foundation pit support anti-seepage system in coastal karst formations. Background technique [0002] Coastal karst formations are subject to complex hydrogeological conditions, which require high support and anti-seepage capabilities for foundation pit engineering. Karst is a general term for various surface and underground dissolution phenomena formed by chemical erosion, disintegration, mechanical destruction, transportation and deposition of soluble rock formations (carbonates, sulfates, halogen salts, etc.) by surface water and groundwater. With the prosperity and development of my country's economy, various construction projects have sprung up like mushrooms after rain. Among all kinds of civil engineering, geotechnical engineering occupies a very important position. As far as the geotechnical engineering of coastal kars...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the water seepage problem of foundation pit engineering in coastal karst formations, and provide a construction of deep foundation pit support and anti-seepage system in coastal karst formations that can effectively solve the serious water seepage problem during the excavation process of deep foundation pits in coastal karst formations method

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