摘要：When horizontal bearing piles are applied in karst areas, the irregular karst caves on the pile side will seriously affect the bearing characteristics of the piles. In this study, anti-slide piles with karst caves in front of the piles are selected as the research objects, the numerical analysis method is used to design the calculation model, and the influence of roof thickness, high span ratio and distance between karst caves and piles on the failure mode of embedded sections of anti-slide piles is studied and analyzed under the conditions of elastic piles and rigid piles. Furthermore, the influence of pile diameter and embedded depth on the horizontal bearing capacity of pile embedded section is further optimized and analyzed. The test results show that the increase of cave roof thickness greatly improves the horizontal ultimate bearing capacity of embedded section, and the failure mode of embedded section changes from compression shear failure of cave roof to shear failure of pile embedded section with the increase of thickness. Compared with the long axis of karst cave is X axis, when the long axis is Y axis, the influence on the pile embedded section is greater. The distance between the karst cave and the pile edge can improve thehorizontal ultimate bearing capacity of embeddedsection to a certain extent, and the greater the distance, the smaller the influence of the karst cave on the bearing capacity of pile embedded section. When the high span ratio is 1.75, the failure mode of pile embedded section will gradually change into compression shear failure of cave roof by increasing the pile diameter, while the failure mode of pile embedded section will change into shear failure of rock mass in front of pile when the pile embedded depth is increased. When the high span ratio is 0.57, the failure mode of pile embedded section is shear failure of rock mass in front of pile under all pile diameter variables.
关键词：Cave in front of pile;Anti-slide pile;Ultimate bearing capacity;Failure mode
