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《Urban Roads Bridges & Flood Control》 2020-04
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Study on Treatment of Karst Cave Foundation under Karst Geological Characteristics

ZHANG Daoling;  
In order to study the karst cave foundation treatment of an airport in Guizhou under the karst geological characteristics, through the investigation of the karst environment, according to the engineering survey report and the airport karst development characteristics, and combined with the actual design,construction and detection results of the project, the adaptive treatment technologies of the karst cave foundation are analyzed, mainly using the dynamic consolidation method to treat the karst depression, funnel,collapse, aven and filled caves, using the clear blasting dynamic consolidation method to treat the latent karst caves and using the ground mixing and high-pressure pouring of C15 concrete to treat the unfilled and semi-filled caves. The experimental results show that the solid volume ratio of the karst cave treated by the dynamic consolidation is greater than 78% of the design requirements. There are no obvious voids in the wave velocity testing. The solid volume ratio of the karst cave treated by the clear blasting dynamic consolidation is more than 83%. The coring rate of karst cave concrete treated by the C15 low-grade concrete is not less than80% and without obvious loss of drill. The heavy-duty dynamic sounding N63.5 is all greater than 5 hits, and there are no obvious voids in the wave velocity testing.
【CateGory Index】: V351
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