Research on Bearing Failure Mode of Micro Pile Groups Based on Ultimate Resistance
This article derives the calculation method for the ultimate bearing capacity of micro pile composite structures based on the principle of stiffness equivalence.And numerical analysis methods were used to study the failure process and ultimate failure mode of micro pile composite structure reinforced slope.Research has shown that:the spacing and structural width of micro piles have a significant impact on the ultimate resistance of micropile composite structures.The smaller the spacing between micro piles,the denser the arrangement,and the wider the structural width,the greater the stiffness of the composite structure and its ultimate resistance.The failure process of micro pile composite structure is divided into four stages:shear failure of sliding surface soil layer,bending failure of micro pile body,shear failure of pile soil interface,and pull-out failure of micro pile body.The ultimate failure form of micro pile composite structure reinforcement slope is pile pull-out failure,which takes the load when the pile undergoes shear failure as the ultimate resistance and underestimates its bearing capacity.The connecting beam can increase the overall stiffness of the micro pile composite structure,but it will not significantly improve its ultimate bearing capacity.
万方数据
维普
