Investigations of Large Scale Sinkhole Collapses, Laibin, Guangxi, China

Abstract

Jili village is located in central Guangxi province, a highly active karst area containing many karst features such as sinkholes, springs, karst windows, caves, and conduit systems (Figure 1).The study area is a typical fengcong and fenglin karst area with isolated and dissolved hills and valleys.The unconsolidated sediments above bedrock are Quaternary alluvium and colluvium.Quaternary deposits consist of silty clay, clay containing gravels, and clay.Karst bedrock units belong to the middle Carboniferous Huanglong Formation (C 2h ) and Nandan Formation (C 2n ).Rock types include thick light-gray limestone, gray fossiliferous limestone, dolomite limestone, siliceous and fossiliferous limestone, limestone containing gravels,