Karst Foundation Embedded In The Rock Pile Kitt Analysis And Experimental Research

The .international studies on the performance of the socketed piles in karst subgrade show still insufficient at present. Therefore, succeeding research is essential on improving the loading mechanism, shear distribution v- socket depth, bedrock thickness and properties. Up to now , the references concerning the simulated test are rarely reported . In this paper , an extensive study on socket depth, and bedrock thickness is carried out and some satisfactory results have been obtained.Based on various international papers, a deep investigation for vertical load transfer has been carried out to propose 6 varieties of load-settlement curve and 4 types of defective P-S curve. 4 approaches have also been suggested in the paper to determine vertical capacity in light of the pile strength, strength and deformation of" surrounding soil and static analysis. In addition, the study touches upon the depth effect of end- bearing and lateral resistance, negative friction to extract the theoretical critical embedded depth and its mechanism.The theoretical analysis for the performances of the socketed pile in karst region and their failure patterns shows the pile stability is mainly due to the vertical load, bedrock thickness and its bending resistance.With the performance of the socketed pile in karst region and Simulate theory . simulated model test plan lias beer. marked out moluding the test equipment ana computing system for collecting daces and results analysis.The choice of similar material is ; key problem- in the simulated model cest. With. the improved "Limited uniform design methods" .the mixture of cement with gypsum and sand is treat as similar material :r. test. Though, a deep analysis of the mterna; interaction in mixture, empirical cropcrtionmg is suggested to effectively simulate limestone . the regressive equation of compression strength and. bending strength prove reasonable. Performing various test C'..Y.~.S . simulate; model tests have beep. earned out to investigate the factors affecting e critical loading capacity including limestone properties - socket depth, bedrock thickness and lateral friction et al.According to the test results and theoretical analyses ,the paper has proposed the approach to examine the safety bedrock thickness, half-theory and half-experience formula associated with vertical load is suggested as followed: ?In karst subgrade, the embedded depth seems difficult to deternine. considering synthetically the correlation, between the pile skin friction resistance and the bedrock internal cohesion and also the influences on loading capacity of pile,-. the mine. socketed length is suggested 0.2 pile diameters or at least 0.2m when the rock surface is level and the upper soil is thick relatively.