预应力锚索抗滑桩滑坡防治结构的动力计算方法研究  

Study on dynamic calculation method for landslide prevention structure of anti-slide pile with pre-stressed anchor cable

作　　者：董建华[1,2] 吴晓磊 连博 陈宝 Dong Jianhua;Wu Xiaolei;Lian Bo;Chen Bao(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《土木工程学报》2022年第11期72-82,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(51778275);中央引导地方科技发展资金项目(YDZX20216200001739);甘肃省基础研究创新群体项目(20JR10RA205);陇原青年创新创业人才(团队项目)(2020RCXM120);甘肃省知识产权局高价值专利培育和转化项目(20ZSCQ034);兰州市十大科技创新项目(2020-2-11)。

摘　　要：为了研究地震作用下预应力锚索抗滑桩新型滑坡防治结构的工作机理和动力计算方法,根据锚索抗滑桩与土体的实际动力相互作用工作机理,基于达朗贝尔原理和符号函数,将受荷段和嵌固段分别简化为两段均匀的弹性连续地基梁,并考虑受荷段桩前后土体地基抗力的差异性,建立了预应力锚索抗滑桩滑坡防治结构的动力计算模型,给出了分段的预应力锚索-抗滑桩-土体体系协同工作的水平地震动力运动方程,并进行了地震响应分析。最后,将提出的方法应用于实际工程,并与数值模拟进行了对比,二者吻合较好,说明提出的方法是实用、可靠的。结果表明:在地震荷载作用下加速度放大系数沿桩高逐渐增加,在桩顶附近放大最明显;抗滑桩向坡体外和坡体内运动时的位移峰值不对称,向坡体外侧运动时的位移峰值明显大于向坡体内侧运动时的位移峰值;抗滑桩桩身分布的剪力和弯矩呈现出“上下小、中间大”的分布,弯矩最大值出现在滑面附近,剪力最大值在滑面位置。To study the working mechanism and dynamic calculation method for the new landslide prevention structure of anti-slide pile with prestressed anchor cable under earthquake load,according to the actual dynamic interaction working mechanism between anti-slide pile with anchor cable and soil,the loaded section and embedded section are respectively simplified into two sections of uniform elastic continuous foundation beam based on D’Alembert principle and symbolic function.Considering the difference of soil foundation resistance before and after the loaded section pile,the dynamic calculation model of landslide prevention structure of prestressed anti-slide pile with anchor cable is established.The horizontal seismic dynamic motion equation of segmented prestressed anchor cable anti-slide pile soil system is given,and the seismic response is analyzed.Finally,the proposed method is applied to practical engineering and compared with numerical simulation method.The two results agree well,which shows that the proposed method is practical and reliable.The results show that the acceleration amplification factor increases gradually along the pile height under seismic load,and the amplification is most obvious near the pile top.The peak displacement of anti-slide pile moving outside and inside the slope is asymmetric,and the peak displacement of anti-slide pile moving outside the slope is significantly greater than that of anti-slide pile moving inside the slope;The shear force and bending moment of the anti-slide pilebody show the distribution of“small up and down and large in the middle”.The maximum bending moment appears near the sliding surface,and the maximum shear force is at the sliding surface.

关 键 词：预应力锚索 抗滑桩 滑坡 地震作用 动力模型 动力特性 

分 类 号：TU443[建筑科学—岩土工程]