大理西站支护边坡振动台试验及数值模拟  

Shaking table test and numerical analysis on reinforced slope at Dali West Railway Station

作　　者：赖杰 刘云 辛建平[3] 王炜 高成强 朱海波 LAI Jie;LIU Yun;XIN Jian-ping;WANG Wei;GAO Chen-qiang;ZHU Hai-bo(College of Combat Support,Rocket Force University of Engineering,Xi’an 710025,China;Faculty of Architectural and Enviromental Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China;95356 Troops,Hengyang 421800,China)

机构地区：[1]火箭军工程大学作战保障学院,陕西西安710025 [2]重庆工业职业技术学院建筑工程与艺术设计学院,重庆401120 [3]95356部队,湖南衡阳421800

出　　处：《浙江大学学报（工学版）》2020年第5期870-878,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51378496);重庆市教委科学技术研究专项资助项目(KJ1730413);重庆市基础科学与前沿技术研究专项资助项目(cstc2017jcyjAX0078);火箭军工程大学青年创新基金资助项目(2018QNJJ003).

摘　　要：以云南省大理西站支护边坡工程为依托,开展边坡振动台试验和数值分析,得到双排抗滑桩的弯矩、锚杆轴力、坡面加速度响应规律及边坡的最终破坏情况.试验表明:坡面加速度响应规律与测点相对位置有关,测点相对位置越高,加速度响应越明显;坡体裂缝影响岩土体动力特性,在裂缝出现后坡体加速度响应规律会发生显著变化;在地震下抗滑桩弯矩分布接近抛物线形状,弯矩的最大值靠近岩土分界线的下方,抗滑桩弯矩随输入地震波幅值增大成非线性增长;锚杆在4 m/s^2地震峰值时刻的动轴向力大于静轴向力的3倍,地震作用是锚杆受力大小的决定因素;由于锚杆的作用,边坡的最终破坏面位于边坡2#的深部,此破裂面位置由边坡2#的中上部土体的滑移破坏与下部土体的越顶破坏组成.Shaking table test and numerical analysis were carried out on the reinforced slope at Dali West Railway Station in YunNan province,China,for obtaining the bending moment of double-row anti-slide piles,the axial force of anchors,the acceleration response and the ultimate failure of the reinforced slope.Results show that the acceleration response of the slope is related to the different relative elevations of measuring points,which could be represented as the higher the relative elevation of measuring points,the more obvious the acceleration response.The dynamic characteristics and the law of acceleration response of rocks and soils within the slope will be changed when cracks appear in the slope.The bending moment distribution of anti-slide piles triggered by earthquake is close to the parabola shape,the maximum value of which would appear near the boundary between rock and soil.The bending moment of the anti-slide piles increases nonlinearly with the increment of the peak ground acceleration(PGA)of input seismic waves.The dynamic axial force of the bolt at the peak time in the earthquake(4 m/s^2)is three times more than the one in the static condition,and the seismic action is the decisive factor for the axial force of the bolt.Based on the action of the bolt,the ultimate failure surface of the slope is located in the deep part of the slope 2#,and the location of the failure surface is composed of the sliding failure in the upper-middle body and the topover failure within the lower body of the slope 2#.

关 键 词：振动台试验 抗滑桩 锚杆 弯矩 破坏面 

分 类 号：P642.2[天文地球—工程地质学]