摘要
二元结构边坡是由上部土体和下部岩体构成的坡体结构类型,由于其潜在滑动剪出口位置较高,一般采用三种类型锚杆进行加固。分别建立此三种锚杆加固边坡模型,采用动力有限元法模拟分析地震过程中边坡动力变形特性及锚杆结构的内力变化规律,并对三种锚杆加固后边坡在震前及震后的稳定性进行对比研究,探讨此三种锚杆加固二元结构边坡的支护效果差异。结果表明:地震作用下,拉力型或压力型预应力锚杆结构对边坡整体变形控制效果无显著区别,而采用通长粘结的非预应力锚杆能更好控制边坡潜在变形范围;地震作用下锚固边坡对坡面PGA放大系数具有抑制作用,预应力锚杆支护对坡面加速度放大作用的抑制效果优于全粘结非预应力锚杆支护;经历地震作用之后的应力重分布,锚杆的轴力显著增大,锚杆轴力调整具有"滞后性"。
The binary structure slope is a type of slope structure composed of upper soil and lower rock mass.Because of its high position of sliding shear,it is generally reinforced by anchor rod.The project is usually used in the fully bonded non-prestressed anchor,tensile prestressed anchor and pressure type prestressed anchor three types respectively.To es-tablish the three kinds of anchor reinforcement slope model,the dynamic finite element method is used to simulate the dy-namic deformation characteristics of the slope during the earthquake and the internal force variation of the bolt structure.And the stability of the three types of bolt reinforcement is discussed.The results show that under the action of earth-quake,the effect of tension or pressure type prestressed anchor structure has no significant difference on the overall defor-mation control effect of slope,and the non-prestressed anchor with long-length bonding can control the potential deforma-tion range of slope.The earthquake has inhibitory effects on the anchorage slope PGA amplification coefficient,the in-hibitory effect is better than that of prestressed bolt which can support the acceleration amplification effect on all non bonded prestressed anchor support.After the earthquake,the stress distribution is increased,the axial force of the bolt is significantly increased,the axial force adjustment of the bolt is hysteresis.
作者
苏德斌
王浩
SU Debin;WANG Hao(College of Environment and Resources , Fuzhou University, Fuzhou, Fujian 350116, China;Geological Engineering Research Center, Fujian Provincial University, Fuzhou, Fujian 350116, China)
出处
《水利与建筑工程学报》
2018年第1期40-47,共8页
Journal of Water Resources and Architectural Engineering
基金
交通运输部建设科技项目(201331849A130)
福建省交通运输科技项目(201242)
关键词
地震响应
不同锚杆类型
锚杆轴力
稳定性分析
二元结构边坡
earthquake response
different bolt type
anchor shaft force
stability analysis
binary structure slope
作者简介
苏德斌(1992-),男,福建泉州人,硕士研究生,研究方向为岩土工程。E-mail:943665387@qq.com;通讯作者:王浩(1978-),男,江苏盐城人,博士,副教授,主要从事工程地质与岩土工程方面的研究。E-mail:h_wang@126.com
