The Study On Skid Resistance Mechanism Of Circular Cross Section Anti-sliding Pile Group

Anti-slide pile is a retaining structure commonly used in large-scale landslide reinforcement. It usually adopt large cross-section rectangle pile by artificial excavation, but the defects of this pile are long work cycle, large excavation disturbances and personnel safety of builders in hole can’t get effective guarantee in the rainy season and stratum saturated by water. However, the circle section pile has advantages of applying rotary pile drill into holes, high efficiency pore-forming, small excavation disturbances, and the option of aperture convenient and flexible. The circle section pile has obvious superiority to large cross-section rectangle pile. But the mechanism and design calculation of anti-slide pile group with the space frame structure of circle section has not the existing specification to adopt. This study aims to discuss the strengthening mechanism of circle section anti-pile through numerical calculation. Its main content includes:(1) Using theoretical analysis method to analyze resist slippery abilities of rectangular anti-slide pile with single pile compared to circular anti-slip pile. The results show that resist slippery ability of circular cross section with single pile is poor, and adopt pile group is reasonable. On this basis to analyze strengthening effect of circular cross section anti-sliding pile group compared to anti-slip single pile with rectangular section in condition of constant section area, the results show that pile group has a better strengthening effect.(2) The circular cross section anti-slide pile group is designed to optimize. The layout method of optimal circular cross section anti-sliding pile group under a certain depth of slip surface is obtained through discussing the pile length, caps stiffness, the column and row spacing distance, and pile diameter.(3) Research the strengthening effect of circular cross section anti-sliding pile group applied to expansive soil slopes, and discuss the engineering suitability of circular cross section anti-sliding pile group.