黄土地基微型桩水平承载力及群桩效应研究

In order to clarify the influence of horizontal bearing capacity of micro-piles on superstructuresafety performance , the effects of pile length , pile diameter , pile elastic modulus and pile spacing on hori-zontal bearing capacity of micro-pile on loess foundation are studied based on in-situ static load test.'Thevariation of pile displacement and bending moment along the foundation depth under different horizontalloads are analyzed.And the influence of pile spacing on the horizontal bearing capacity of pile groups isanalyzed with the aid of the verified finite element model.The results show that the position of the greaterbending moment of micro-pile foundation on loess soil is about 4d-5d from pile top. The pile diameter hasa greater impact on the horizontal bearing capacity of the micro-pile, but the influence is relatively smallwhen the pile length exceeds the optimal pile length (33d-35d). When the pile spacing reaches 8d , the in-fluence of the pile group effect on the horizontal bearing capacity of the pile group can be ignored. The a-bove research results provide some reference for the application of micro-pile on loess foundation.