含建筑桩基的顺层岩质边坡桩锚支护体系振动台模型试验研究  

Shaking table model test study of pile-anchor support system for bedding rock slope with building pile foundation

作　　者：吴曙光[1] 毛振南 潘林 薛尚铃[3] 徐革[3] WU Shuguang;MAO Zhennan;PAN Lin;XUE Shangling;XU Ge(School of Civil Engineering,National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,Chongqing University,Chongqing 400045,P.R.China;Development Planning and Quality Assurance Department,Chongqing Electric Power College,Chongqing 400053,P.R.China;CISDI Engineering Co.,Ltd.,Chongqing 400013,P.R.China)

机构地区：[1]重庆大学土木工程学院,库区环境地质灾害防治国家地方联合工程研究中心,重庆400045 [2]重庆电力高等专科学校发展规划与质量保障处,重庆400053 [3]中冶赛迪工程技术股份有限公司,重庆400013

出　　处：《土木与环境工程学报（中英文）》2024年第2期11-22,共12页Journal of Civil and Environmental Engineering

基　　金：国家重点研发计划(2018YFC1505501);重庆市住房和城乡建设委员会科研项目(2020-22)。

摘　　要：基于Bockinghamπ定理,对具有建筑桩基的顺层岩质边坡桩锚支护体系开展振动台模型试验,通过分析预应力锚索、建筑桩基的应变以及边坡坡顶加速度,研究支护体系的动力响应规律。结果表明,预应力锚索的应变在地震波加速度达到峰值时达到最大值,且上排锚索受力大于下排锚索,随着地震幅值的增大,最上排锚索锚固段率先发生滑移破坏失去锚固作用;建筑桩基应变最大值点位于滑动面以下一定深度,且远离边坡坡面的建筑桩基受力大于邻近边坡坡面的建筑桩基;坡顶各点峰值加速度随地震波幅值增大整体表现为线性增大,但在Wenchuan-Wolong波(0.55g)和Sin波(0.4g)工况时,各点峰值加速度相对有所下降,随着地震波幅值增大,各点峰值加速度放大系数在汶川波和正弦波作用下并非单调变化,而是表现为先减小后增大波动变化特点。Based on Bockinghamπtheorem,a shaking table model test is carried out for the bedding rock slope with building pile foundation.Strain value of building pile foundation and the acceleration of the slope top,the seismic dynamic response of the system is studied base on the presstressed anchor cable.The results indicate that the strain of the anchor cable changes with the seismic wave,and the strain of the anchor cable reaches the maximum when the seismic wave reaches the peak,indicating that the upper cable force is larger than the lower.When the seismic amplitude increases,the upper anchor cable slips,and the anchoring effect decreases.The maximum strain of building pile foundation is located at a certain depth below the sliding surface,and the stress of building pile foundation far away from the slope is greater than that near the slope.The peak accelerations of slope top increase linearly with the seismic amplitude,but under the condition of Wenchuan-Wolong wave(0.55g)amplitude and Sin wave(0.4g)amplitude,there is a decreasing tendency among the peak acceleration at each point.With increase of seismic amplitude,the peak acceleration amplification coefficient of each point under Wenchuan and Sin earthquake does not change monotonously,but decreases first,and then increases.

关 键 词：建筑桩基 顺层岩质边坡 桩锚挡墙 振动台 模型试验 

分 类 号：TU473.1[建筑科学—结构工程]