地震作用下预应力锚索对岩石边坡稳定性影响的模拟方法及锚索优化研究  

Modeling of prestressed anchors in rock slope under earthquake and optimization of anchor arrangement

作　　者：郑文博[1] 庄晓莹[1,2] 蔡永昌[1] 薛凤忠[1] 

机构地区：[1]同济大学地下建筑与工程系,教育部岩土工程重点实验室,上海200092 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《岩土工程学报》2012年第9期1668-1676,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51109162);长江学者和创新团队发展计划资助项目(IRT1029);国家重点实验室开放基金项目(SKLGP2012K016);西部交通建设科技项目(2011ZB04);十二五科技支撑计划项目(2011BAB08B01)

摘　　要：以西部某水电岩石高边坡为背景,采用杆单元和杆单元节点集中力的方法模拟边坡自由式预应力锚索,通过有限元模拟和拟静力法分析相结合的分析方法,由有限元软件计算在地震作用下的锚索内力分布、边坡位移,并通过自编后处理程序计算出最不利结构面组合下的边坡整体稳定性安全系数。在此基础上,研究预应力锚索的锚固角度、预应力大小、锚固深度、锚索排间距与结构面之间的空间关系对地震作用下边坡变形和整体稳定性的影响规律,并以此为依据提出预应力锚索优化设计方法。The seismic analysis of slope stability is carried out by combining the finite element method and the pseudo-static method. The slope anchor is modeled by the link element and the prestress state is modeled by applying nodal forces to the element. The method is employed to analyze a high rock slope in the western region of China. The distribution of the internal force of the prestressed anchors and the slope displacement are obtained. The safety factor along the critical joint plane is calculated by using an in-house code. The influences of the relation among the anchorage angle, anchorage length, spacing of anchors and structural plane of the slope on the displacement and stability of the slope under earthquakes are also studied. Based on the above research, the optimal prestressed anchor scheme is proposed and verified by 2D and 3D tests.

关 键 词：岩石边坡 地震 预应力锚索 杆单元 拟静力法 

分 类 号：TU47[建筑科学—结构工程]