河南理工大学学报（自然科学版）2026，Vol.45Issue(4)：11-21,11.DOI:10.16186/j.cnki.1673-9787.2026020003
水平变向循环荷载作用下嵌岩桩承载特性研究
Study on the load-bearing behavior of rock-socketed piles under multidirectional horizontal cyclic loading
摘要
Abstract
Objectives The horizontal load-bearing mechanism of rock-socketed single piles under different loading paths remains unclear.Therefore,this study investigates the load-bearing behavior of rock-socketed piles subjected to multidirectional horizontal cyclic loading.Methods Based on a self-developed horizontal cyclic loading test apparatus,field horizontal cyclic loading tests were conducted in four loading directions(0°,45°,90°,and 135°)to investigate the horizontal load-bearing behavior of rock-socketed piles under multidirectional cyclic loading.Results The results indicate that the horizontal displacement of the pile decreases with increasing embedded depth.Multidirectional horizontal cyclic loading subjects the surround-ing rock mass to cyclic pressures from different directions,resulting in plastic deformation around the pile.The plastic deformation gradually stabilizes with variations in loading direction and the number of loading cycles.The increase in pile bending moment is mainly concentrated within the first 15 loading cycles.After 1 000 cycles,the bending moment no longer increases.The fixity provided by the weathered rock layer is mainly concentrated within the embedded depth range of 0-1.5 m.The peak surrounding rock resistance occurs at an embedded depth of 0.5 m and remains unchanged with the number of loading cycles.As the number of loading cycles increases,the surrounding rock resistance gradually stabilizes.The p-y curves under 0°,45°,and 90°horizontal cyclic loading are approximately linear,whereas the p-y curve under 135° loading exhibits a nonlinear response.After more than 15 loading cycles,the surrounding rock reaction begins to decrease,accompanied by a reduction in the stiffness of the pile-rock interface.Conclusions Multidirec-tional cyclic horizontal loading causes the horizontal load-bearing mechanism of rock-socketed piles to exhibit pronounced path-dependent characteristics,with the shallow strongly weathered rock mass playing a dominant role in controlling the bearing performance.Multidirectional cyclic loading accelerates the degra-dation of the equivalent stiffness of the pile-rock system and promotes the development of a nonlinear p-y response.In the later loading stages,rock mass failure becomes the key factor limiting the horizontal bearing capacity of rock-socketed piles.关键词
变向水平循环荷载/嵌岩桩/桩周岩石抗力/p-y曲线Key words
multidirectional horizontal cyclic loading/rock-socketed pile/surrounding rock resistance/p-y curve分类
建筑与水利引用本文复制引用
郑灿,尚文昌,嵩贺兴,刘俊伟,赖怀远,胡誉焜,齐光宇,张英宇,代邢可..水平变向循环荷载作用下嵌岩桩承载特性研究[J].河南理工大学学报（自然科学版）,2026,45(4):11-21,11.基金项目
国家自然科学基金资助项目(42277135) （42277135）
