水平荷载作用下边坡-负载嵌岩单桩体系拟静力试验研究  

Pseudo-static test of slope-single load rock-socketed pile system under horizontal load

作　　者：刘立平[1] 李孟 曾未名 李瑞锋 刘磊[1] LIU Liping;LI Meng;ZENG Weiming;LI Ruifeng;LIU Lei(School of Civil Engineering,Key Laboratory of Earthquake Resistance and Disaster Prevention for Engineering Structures,Chongqing University,Chongqing 400045,P.R.China;Sichuan Academy of Construction Sciences Co.Ltd,Chengdu 610081,P.R.China)

机构地区：[1]重庆大学土木工程学院,结构抗震防灾重庆市重点实验室,重庆400045 [2]四川省建筑科学研究院有限公司,成都610081

出　　处：《土木与环境工程学报(中英文)》2025年第2期89-97,共9页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(52278481);重庆市建设科技项目(城科字2020第3-16)。

摘　　要：为研究水平荷载作用下竖向负载岩质边坡单桩承载特性,鉴于开展动力学试验较为困难和复杂,采用拟静力试验方法,以相似材料模拟岩体及桩基,施加竖向与水平荷载,开展3组试验,分析不同坡度及桩岩弹性模量比下桩身弹性弯矩、桩周岩石压力及桩顶滞回曲线的变化规律。结果表明:岩质边坡桩基水平承载力主要与埋深3D(D为桩径)以上范围内的浅层坡体有关;下坡向岩体的破坏形式与土质边坡类似,经历了裂缝出现,破坏面发育、浅层坡体破坏3个阶段,但上坡向岩体并未形成完整破坏面;桩基最终剪切破坏表明,在中风化岩质边坡条件下,水平承载力主要由桩身强度控制;坡度主要影响上坡向承载力,当坡度由15°变化为30°时,上坡向承载力提高了41.3%,下坡向承载力仅提高了0.15%,而当桩岩弹性模量比由2.8变为0.9时,正向承载力提高了80.7%,负向承载力也提高了73.5%。In order to study the bearing characteristics of single loaded rock-socketed pile under horizontal load,pseudo-static model tests considering the vertical and horizontal loadings were adopted in view of the challenge of dynamic test,in which rock and pile are simulated with similar material.The elastic bending moment,rock pressure around the pile and the hysteresis curve of the pile top are analyzed under different slopes and elastic modulus of rock.The results show that the horizontal bearing capacity of pile foundation of rock slope is mainly related to shallow slope within the range of buried depth above 3D(D is pile diameter).The failure pattern of the downslope rock mass is similar with that of the soil slope,which goes through three stages:the emergence of cracks,the development of failure surface and the failure of the shallow slope body,even though the upslope rock mass has not formed a complete failure surface.Finally,the shear failure of pile foundation leads to the failure of horizontal bearing capacity,indicating that when the slope is of rock,the slope mainly affects the positive bearing capacity.When the slope angle ranges from 15°to 30°,the positive bearing capacity increases by 41.3%,while the negative bearing capacity only increases by 0.15%.The slope material strength has an impact on both positive and negative bearing capacity.The pile-rock elastic modulus ratio changes from 2.8 to 0.9,while the positive and negative bearing capacity increase by 80.7%and 73.5%,respectively.

关 键 词：边坡嵌岩桩 水平承载特性 桩土相互作用 拟静力试验 

分 类 号：TU473.1[建筑科学—结构工程]