水平变向循环荷载作用下嵌岩桩承载特性研究OA
Study on the load-bearing behavior of rock-socketed piles under multidirectional horizontal cyclic loading
目的 不同荷载路径下嵌岩单桩水平承载机理尚不明确,为此开展水平变向循环荷载作用下嵌岩桩承载特性研究.方法 基于自主研发的水平循环加载试验装置,进行0°,45°,90°,135°不同加载方向的循环加载现场试验,研究变向循环荷载下嵌岩单桩水平承载特性.结果 结果表明:桩身水平位移随埋深增加呈下降趋势,变向水平循环加载使桩周岩体受到不同方向的水平循环压力而出现塑性变形,且塑性变形随水平加载方向和循环加载次数变化逐渐达到稳定状态;桩身弯矩增大主要集中在前15次循环加载,1 000次循环加载后,桩身弯矩不再增加,桩侧风化层岩体对试验桩的嵌固作用主要集中在埋深0～1.5 m;桩周岩石抗力峰值位于埋深0.5 m处,且不随循环加载次数发生变化,随着循环加载次数增加,桩周岩石抗力逐渐趋于稳定;0°,45°,90°水平循环加载p-y曲线近似呈线性,135°水平循环加载p-y曲线为非线性,循环加载次数超15次后,桩周反力开始下降,桩-岩界面刚度降低.结论 变向循环水平荷载使嵌岩桩的水平承载机制呈明显的路径依赖特征,浅层强风化岩体对承载性能起主导控制作用.多方向循环作用将加剧桩-岩体系等效刚度退化并促使p-y响应向非线性状态发展,后期岩体破坏成为限制嵌岩桩水平承载能力的关键因素.
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.
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
中国能源建设集团 广东省电力设计研究院有限公司,广东 广州 510670青岛理工大学 土木工程学院,山东 青岛 266000中国能源建设集团 广东省电力设计研究院有限公司,广东 广州 510670青岛理工大学 土木工程学院,山东 青岛 266000||青岛市港口智能建造与运维重点实验室,山东 青岛 266520中国能源建设集团 广东省电力设计研究院有限公司,广东 广州 510670青岛理工大学 土木工程学院,山东 青岛 266000青岛理工大学 土木工程学院,山东 青岛 266000青岛理工大学 土木工程学院,山东 青岛 266000青岛理工大学 土木工程学院,山东 青岛 266000||上海市政工程设计研究总院(集团)有限公司,上海 200092
建筑与水利
变向水平循环荷载嵌岩桩桩周岩石抗力p-y曲线
multidirectional horizontal cyclic loadingrock-socketed pilesurrounding rock resistancep-y curve
《河南理工大学学报（自然科学版）》 2026 (4)
11-21,11
国家自然科学基金资助项目(42277135)
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