The Analyse Of Karst Cave To Building Ground Stability Influence And Grouting Technology

Karst is widely spreaded in China, many buildings are inevitably built in karst areas,and collapse caused by karst will bring serious disaster,so it is essential to study karst collapse on which the foundation is.This paper is cited Lishui Bridge tower foundation to analyze the foundation on the carst areas and then bring up those ideas:At first,based on the mechanismt of karst collapse, karst foundation stability factors and the stability evaluation of karst ground. And by field explorating the Lishui Bridge to analysis the law of karst development,The development characteristics of karst mainly verticallySecondly,karst foundation is instability thought qualitative evaluation and Quantitative Calculation.thirdly,cracks need to measure based on above, and such jobs were done based on the discussed reasons:prevent water in the cracks to prevent further expansion of karst; reinforce broken rocks to improve the integrity of rocks; apply fillinging grouting and compaction grouting with cement mortar to increase bearing capacity of foundationDue to its unique karst grouting with characteristics, its construction workload is big, large amount of grouting, construction condition is complex, often appear unexpected things, therefore, according to lishui bridge engineering geological conditions and the construction experience summarized the grouting should pay attention to the matters.Finally,the effect of grouting test and its importance, through the grouting area radar test, on the whole found the cave and the dissolution of large fracture zone, to the effect of karst management, in addition to electromagnetic anomalies still exist in some areas are suggested in areas of local authentication and encryption area drilling grouting.