摘要
弃渣场边坡稳定性通常受到地质条件、水文条件、渣体特性、弃渣工艺及外界条件等因素影响,同时各因素间存在着复杂的相互关联性。为了保障弃渣场安全,了解特定条件下弃渣场稳定性的影响因素,选取某铁路隧道弃渣场为研究对象,通过弃渣场边坡的数值模型,研究地震工况对弃渣场边坡稳定性的影响。结合数值模拟结果与非线性时程分析得出的场地整体稳定系数,对地震作用下弃渣场边坡做出稳定性评价。研究结果表明:通过将有限元软件模拟的地震作用下弃渣场应力、剪应变与位移结果与天然状况下的合并分析,推断出东达弃渣场边坡在地震基本烈度为7度地震条件下处于稳定状态。从非线性时程分析法出发,在地震作用下对4 s, 8 s, 12 s, 16 s四个时间节点下的弃渣场有效应变进行分析,根据有效应变先增大后趋于平稳的趋势及地震波加速度变化幅度,判定出东达弃渣场处于稳定不破坏状态。
The slope stability of the waste disposal area is usually affected by geological conditions,hydrological conditions,slag body characteristics,waste disposal technology and external conditions,and there is a complex correlation between the various factors.In order to ensure the safety of the waste disposal area and understand the influencing factors of the stability of the waste disposal area under specific conditions,a railway tunnel waste disposal area is selected as the research object to study the impact of earthquake conditions on the stability of the waste disposal area slope through the numerical model of the waste disposal area slope.Finally,combined with the numerical simulation results and the overall stability coefficient of the site obtained from the nonlinear time history analysis,the stability of the waste dump slope under the earthquake is evaluated.The research results show that:through the combined analysis of the stress,shear strain and displacement results of the waste dump under the earthquake action simulated by the finite element software and the natural conditions,it is inferred that the slope of Dongda waste dump is in a stable state under the seismic basic intensity of 7 degrees.Starting from the nonlinear time history analysis method,the effective changes of the waste dump under the earthquake action at four time nodes of 4 s,8 s,12 s and 16 s are analyzed.According to the trend that the effective changes first increase and then tend to be stable and the variation amplitude of seismic wave acceleration,it is determined that the Dongda waste dump is in a stable and non destructive state.
作者
张鹏
Zhang Peng(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an Shaanxi 710043,China)
出处
《山西建筑》
2023年第17期96-99,共4页
Shanxi Architecture
关键词
弃渣场边坡
稳定分析
非线性时程分析
waste dump slope
stability analysis
nonlinear time history analysis
