摘要
泄流坡位于甘肃南部舟曲县境内,分布在坪定—化马断裂带上,属于典型的断裂带滑坡,断层不仅控制着滑坡边界,也影响着滑坡土体变形。通过现场调查取样并开展室内实验,获取滑坡土体物理力学参数。综合运用有限单元法基本原理,采用时间硬化Drucker-Prager土体流变本构方程,分析在构造应力场和重力场作用下,滑坡土体受力与变形,并与现场监测数据比较,研究泄流坡滑坡的变形特征。指出断层上、下断盘控制着滑坡体边界和走向,也影响边界接触区域土体变形。泄流坡滑坡土体流变变形在坡体中部最大,并在滑坡体上交替形成堆积区与拉裂区。计算结果表明泄流坡滑坡坡体最大流变变形滑移量目前稳定在0.3m·a^(-1),仍处于稳定蠕滑状态,流变变形占全年滑动变形的8.36%。指出泄流坡坡脚堆载反压对于泄流坡坡体整体变形影响较小,但可以显著缓解S313公路路基变形。
Xieliupo landslide in Zhouqu is a typical landslide in fracture zone. The fault not only controls the landslide boundary,but also affects its deformation. In this paper,the deformation and stress of landslide is discussed using finite element method with Drucker-Prager soil rheological constitutive model. The results are as follows.（ 1） The plastic deformation of soil is strongly affected by the faults. It is worse than that of footwall fault in the boundary of landslide.（ 2） There is alternant distribution of accumulation zone and cracking zone in landslide mass.（ 3） It is in the state of creeping deformation and the max deformation occurs in the center of the landslide with 0. 3m per year.（ 4） The surcharge loading can significantly relieve pavement deformation of Highway No. S313.
出处
《工程地质学报》
CSCD
北大核心
2017年第2期463-471,共9页
Journal of Engineering Geology
基金
国家科技支撑项目(2011BAK12B09)
地质调查项目(1212011120072)
安徽省教育厅重点项目(KJ2014A030)资助
关键词
断裂带滑坡
流变本构方程
数值计算
变形特征
Landslide within fault zone
Soil rheological constitutive model
Numerical calculation
Deformation feature
