2017•IOP Conference Series Materials Science and EngineeringOpen access

Study on Roof Safe Thickness of Rock Foundation with Karst Cave and Karst Cave-surrounding Rock Stability

Dongqin Chen, Cao Yi

Abstract

The deformation of karst cave-surrounding rock and its roof thickness are the key indicators to evaluate the stability of karst cave foundation. According to engineering characteristics of pile foundation in karst area, Using mechanical analytical method, cave-surrounding rock elasticity theory and Griffith criterion to calculate the safe thickness of Karst cave roof. According to karst cave-surrounding rock unstable and failure conditions, such as groundwater, different pile diameter, different thickness of Karst cave roof.Through comparing and analyzing engineering cases, the results show that the mechanical analytical method to determine the safety thickness of Karst cave roof can not meet the engineering requirements, determine the safe thickness of Karst cave roof Should be based on stability of cave-surrounding rock.

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Key concepts: Karst, Cave, Roof, Geology, Geotechnical engineering, Pile, Foundation (evidence), Groundwater