考虑时间效应的泄流坡滑坡变形特征
发布时间：2019-01-05 04:24
【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。
[Abstract]:The leachate slope is located in Zhouqu county in southern Gansu province and is distributed in the Pingding-Huama fault zone, which is a typical landslide. The fault not only controls the landslide boundary, but also affects the deformation of the landslide soil mass. The physical and mechanical parameters of landslide soil were obtained by field investigation and laboratory experiments. Based on the basic principle of finite element method and the rheological constitutive equation of time-hardened Drucker-Prager soil, the stress and deformation of landslide soil under the action of tectonic stress field and gravity field are analyzed and compared with the field monitoring data. The deformation characteristics of leachate slope landslide are studied. It is pointed out that the lower fault plate controls the boundary and strike of the landslide body and also affects the deformation of soil in the boundary contact area. The rheological deformation of the leachate landslide is the largest in the middle of the slope, and the accumulation area and the tensile crack zone are formed alternately on the landslide body. The results show that the maximum rheological deformation slip of leachate landslide is stable at 0.3m a-1 and is still in a steady creep state, and the rheological deformation accounts for 8.36% of the whole year's sliding deformation. It is pointed out that the backpressure at the bottom of the leachate slope has little effect on the overall deformation of the leachate slope body, but it can significantly alleviate the roadbed deformation of the S313 highway.
【作者单位】： 安徽工业大学建筑工程学院;中国地质科学院地质力学研究所;
【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
【分类号】：P642.22
本文编号：2401261
[Abstract]:The leachate slope is located in Zhouqu county in southern Gansu province and is distributed in the Pingding-Huama fault zone, which is a typical landslide. The fault not only controls the landslide boundary, but also affects the deformation of the landslide soil mass. The physical and mechanical parameters of landslide soil were obtained by field investigation and laboratory experiments. Based on the basic principle of finite element method and the rheological constitutive equation of time-hardened Drucker-Prager soil, the stress and deformation of landslide soil under the action of tectonic stress field and gravity field are analyzed and compared with the field monitoring data. The deformation characteristics of leachate slope landslide are studied. It is pointed out that the lower fault plate controls the boundary and strike of the landslide body and also affects the deformation of soil in the boundary contact area. The rheological deformation of the leachate landslide is the largest in the middle of the slope, and the accumulation area and the tensile crack zone are formed alternately on the landslide body. The results show that the maximum rheological deformation slip of leachate landslide is stable at 0.3m a-1 and is still in a steady creep state, and the rheological deformation accounts for 8.36% of the whole year's sliding deformation. It is pointed out that the backpressure at the bottom of the leachate slope has little effect on the overall deformation of the leachate slope body, but it can significantly alleviate the roadbed deformation of the S313 highway.
【作者单位】： 安徽工业大学建筑工程学院;中国地质科学院地质力学研究所;
【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
【分类号】：P642.22
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1 蒋树;文宝萍;赵成;李瑞冬;;甘肃舟曲泄流坡滑坡活动机理分析[J];中国地质灾害与防治学报;2013年03期
，本文编号：2401261
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