基于有限差分法的季冻区公路土质路堑边坡稳定性分析  

Soil slope stability analysis based on the finite difference method in seasonal frozen regions

作　　者：葛琪[1] 李京子[2] 武鹤[1] 何岩[1] 侯润彤 GE Qi LI Jingzi WU He HE Yan HOU Runtong(College of Civil and Architectural Engineering, Heilongjiang Institute of Technology, Harbin, China College of Computer Science and Technology, Heilongiiang Institute of Technology, Harbin 150050, China)

机构地区：[1]黑龙江工程学院土木与建筑工程学院,黑龙江哈尔滨150050 [2]黑龙江工程学院计算机科学与技术学院,黑龙江哈尔滨150050

出　　处：《黑龙江工程学院学报》2017年第1期12-14,18,共4页Journal of Heilongjiang Institute of Technology

基　　金：黑龙江省自然科学基金项目(E201117);黑龙江省普通高等学校青年学术骨干支持计划项目(1252G050)

摘　　要：季节冰冻区土质边坡在春融期常发生的浅层滑坡多与冻融界面水分积聚直接相关。为研究基于水分迁移规律的土坡稳定性,结合连续介质显式拉格朗日有限差分法,耦合温度、土体自重以及土体内部渗流力的相互作用,构建季节冰冻区正融土质边坡的实体模型,模拟外界环境温度从-5℃升高到+10℃时,分析季节冰冻地区正融土坡失稳破坏时的实际状况。以冻融界面土坡的失稳破坏试验为基础,对比分析不同冻融循环次数时含水量对融化土坡稳定系数的影响情况。分析表明,在温度变化条件下,边坡的滑动薄弱界面是冻融土体的交界面位置,同时随着含水量及冻融次数的不断提高,临界深度接近该地区平均最大冻结深度。分析结果可为季节冰冻区土质边坡的排水结构设计提供借鉴。The shallow landslide hazards of soil slopes in seasonal frozen regions are usually related to the moisture migration. Continum explicit finite difference method （FDM） is applied to the research. Considering the temperature, gravity and seepage force, the soil slope solid model of seasonal frozen regions is established. As the outside temperature alters from -5℃ to 10℃, the simulation presents the characteristic of plastic distribution and the development tendency of shear strain increment inside the soil slope, and reveals the unfavorable stress position and failure mode of soil slope of seasonal frozen regions. Analysis shows that, considering the uniform temperature distribution, the generalized shear strain increment inside the melting soil slope is approximately the linear form. The failure surface is the interface between the frozen and thawed surface in the slope. The conclusion can provide a reference for the drainage structure design in the seasonal frozen area.

关 键 词：正融土质边坡 数值模拟模型 有限差分法 冻融界面 

分 类 号：U416.1[交通运输工程—道路与铁道工程]