Critical conditions for karst collapses in the Yongwen Middle School,Guiyang,China
JIANG Fuwei
LI Liang
CHEN Hang
Abstract：There are 7 karst collapses happened and 1 potential collapse site in the Yongwen Middle School of Guiyang city,which pose a serious threat on the safety of teachers and students and property there.This site is characterized by highly soluble bedrock,thin covering clay layer and strong groundwater erosion;these have caused the site to be a high-risk karst collapse in this area.Through laboratory simulation test,it is re-alized that the karst collapse hazard follpwed a fissure-seepage-disintegration model.The results also show that the soil water content is critical in the disintegration and the formation of karst collapses.Furthermore, 8 sets of undisturbed samples with different water content are used to conduct disintegration tests.They demonstrate that the water content of 26.8％ is the critical value to trigger karst collapse,while 0～26.8％ is the condition for generation of such a risk at the site.
Keywords：karst collapsedisintegration testcritical water contentsimulation test of collapse
Publication Date：2018-01-01
Pages：6( 294-299 )