Theory Of Block Rockmass Slope Collapse Monitoring And Prediction And Its Application

Along with the fast development of basic engineering construction, problems of rock slope collapse cut by railway and highway become more and more serious. By statistic, among the recent collapses, block rock slope fallings take up 67%, which greatly threaten safety of engineering and its working. The research of Theory of Block Rockmass Slope Collapse Monitoring and Prediction and Its Application is carried out to develop an effective monitoring and predicting theory and technique to avoid collapse geological disaster and protect safety of people's life and property. This work is completed based on pivot project fund of Ministry of Transportation & Communication (200331880201) Research of Highway Geological Disaster Monitoring and prediction, and Hunan province transportation & communication office project (No. 200506) Research of high steep slope collapse and slide geological disaster prediction and control technique in Hengyan expressway.There are six main sections in this paper:1) Problems of block theory for engineering application are summed up for furture studying in the first chapter. Negative exponential probability method is introduced to block theory to analyze slope potential failure block stability and find out the key block more accurately. Stability equations based on collapse down with single surface and double surface are deduced to computer the stability of block crack rockmass.2) The joint trace length probability distribution model is proposed to calculate block size distribution probability and its failure probability in block size zone. The joint trace length probability analysis is very available for opening out the mechanism of block rockmass slope collapse and evaluating block character quantificationally.3) Five kinetic types of collapses are studied to evaluate its damage energy and area by calculateing velocity and displacement of fallings.4) With nonlinear numeric analysis measure, the rockmass slope collapse mechanism and its potential movable area are further studied, which takes the rockmass joint cranny into account, to verify stability analysis results by block theory.5) A theory system of rockmass slope collapse monitoring and prediction is developed to predict collapse occurrence. In this system, block rockmass acoustic emission character and collapse critical failure criterion are proposed by laboratory test, and a reasonable blue print for field test is constituted based on the test results, then a gray and catastrophic model is deduceed to forecast the failure time and scope of collapse.6) The theory system of block rockmass collapse monitoring and prediction is verified effective by its application in k79+380～k79+500 right slope in Guibi highway and k303+600 right slope in Xiangqian road.