地震工况下兰州南绕城高速公路路堑高边坡格构支护效果评价
投稿时间:2020-04-24  修订日期:2020-06-23  点此下载全文
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作者单位E-mail
王江荣 兰州石化职业技术学院 lzshwjr@163.com 
基金项目:(1)兰州市科学技术局计划项目(兰财建发[2019]62号);(2)兰州市西固区科学技术局计划项目(西科发[2017]29号)。
中文摘要:利用AutoCAD及ANSYS软件建立兰州南绕城高速公路具有格构锚杆支护的三维路堑高边坡数值模型,运用有限差分软件FLAC3D对地震工况下的边坡稳定性及格构锚杆支护受力情况进行模拟分析。结果表明:水平向地震加速为0.1g和0.2g时边坡处于稳定状态,水平向地震加速为0.3g时边坡处于基本稳定状态,水平向地震加速为0.4g时边坡处于不稳定状态;格构锚杆支护承受了大量拉张应力及剪应变增量等,效果显著,对边坡稳定性发挥了重要作用。因公路建设区抗震设防烈度为8度,地震加速度设计为0.2g,所以地震工况下的格构支护边坡处于稳定(稳定系数为1.15)状态,满足规范要求。
中文关键词:路堑高边坡  格构锚杆支护  水平地震加速度  边坡稳定性  FLAC3D
 
Evaluation on the effect of lattice support of cutting high slope of Lanzhou South Ring Expressway under earthquake condition
Abstract::Using AutoCAD and ANSYS software to establish a three-dimensional numerical model of high cutting slope with lattice bolt support in Lanzhou South Ring Expressway, and using finite difference software FLAC3D to simulate and analyze the slope stability and the stress of lattice bolt support under the earthquake condition. The results show that: the slope is stable when the acceleration of horizontal earthquake is 0.1g and 0.2g, the slope is basically stable when the acceleration of horizontal earthquake is 0.3g, and the slope is unstable when the acceleration of horizontal earthquake is 0.4g; Lattice bolt support bears a lot of tensile stress and shear strain increment, etc,the effect is remarkable, and it plays an important role in slope stability. Because the seismic fortification intensity of the highway construction area is 8 degrees and the design seismic acceleration is 0.2g, the lattice-supported slope under earthquake conditions is in a stable state (the stability coefficient is 1.15), which meets the requirements of the code.
keywords:high cutting slope  lattice bolt support  horizontal seismic acceleration  slope stability  FLAC3D
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