锚杆参数对锚固边坡抗震性能影响研究  

Study of effects of anchor parameters on seismic performance of anchor slope

作　　者：徐乾[1,2] 张永兴[1,2] 陈建功[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《岩土力学》2013年第S1期472-478,493,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51027004)

摘　　要：分析了锚固边坡锚杆与岩土体在动力荷载下的黏结机制,提出了一种简化的锚杆岩土体相互作用的动力学模型,推导了锚杆岩土体系统的动力响应解析解。结合该简化的锚杆岩土体动力学模型,借助ANSYS有限元程序建立锚固边坡数值模型,分析了在地震荷载作用下,锚杆参数(弹性模量、横截面积、长度、间距)变化对锚固边坡抗震性能(位移、加速度、应力)的影响。分析结果表明:锚杆参数对锚固边坡抗震性能影响强弱不一,增大横截面积可以有效提高边坡抗震稳定性,减小间距也可以改善边坡抗震性能;而弹性模量和长度对边坡抗震性能提高不大,甚至还会起反作用。这些结论对于锚固边坡的抗震设计有一定的借鉴作用。Firstly,it is analyzed bond mechanism between anchor and soil in anchor slope under dynamic loads;then a simplified dynamic model of interaction between anchor and soil is proposed;and a dynamic responses analytical solution to anchor and soil system is deduced.According to this simplified dynamic model of anchor and soil,a numerical model of anchor slope is established by ANSYS program.And the effects of anchor parameters,such as elasticity modulus,cross-section area,length,space on seismic performances,such as displacement,acceleration,stress of anchor slope under the effect of seismic load are analyzed.Analysis results indicate that the anchor parameters have different effects on seismic performance of anchor slope.Increasing anchor cross section area is able to improve seismic stability of slope effectively;and decreasing anchor space is also beneficial for improving seismic performance of anchor slope;while changing elasticity modulus and cross section area have little effect on enhancing seismic performance of slope,instead increasing elasticity will play negative role for improving seismic performance of anchor slope.These conclusions may provide some references for anchor slope seismic design.

关 键 词：锚杆参数 锚固边坡 抗震性能 ANSYS 简化动力学模型 抗震稳定性 

分 类 号：TU435[建筑科学—岩土工程]