TEST RESEARCH ON FAILURE MECHANISM OF ROCK-SOCKETED PILE IN KARST AREA

Based on indoor model test, the research on failure mechanism of rock-socketed pile was carried on. The test indicated that, the failure process was divided into three stages, they were stably bear load stage, cracks occurred stage and failure stage, there were three special zones, they were tensile area near pile, compression area under pile tip and tensile area under a certain depth, the failure reason maybe tensile shear failure or compression shear failure, and cave roof thickness 3d was the critical value of different failure modes. Known from test results, the failure modes could be divided into four types, they were punching failure, collapsed zone failure, sector plastic zone failure and tearing failure.