| 基于物理模型试验的多层滑带滑坡变形演化特征 |
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| 引用本文： | 杨登芳,胡新丽,徐楚,王强,牛李飞,张杰豪.基于物理模型试验的多层滑带滑坡变形演化特征[J].地质科技通报,2022,41(2):300-308. |
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| 作者姓名： | 杨登芳 胡新丽 徐楚 王强 牛李飞 张杰豪 |
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| 基金项目： | 中央高校基本科研业务费专项资金项目CUGCJ1701国家重点研发计划项目2017YFC1501302国家自然科学基金重点项目41630643 |
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| 摘 要： | 滑坡变形演化特征一直是滑坡灾害预测与防治领域急需解决的关键问题, 但对于多层滑带滑坡的变形演化特征却少有研究。以物理模型试验为手段建立了三层滑带滑坡物理试验模型, 完成了多层滑带滑坡变形演化全过程的模拟。基于PIV技术获取坡表位移数据, 通过柔性测斜仪监测滑坡深部位移, 同时布设土压力盒获取滑坡内部土压力的变化情况, 实现了多层滑带滑坡演化过程多参量数据分析。试验结果表明, 多层滑带滑坡破坏过程可分为初始、等速、加速和破坏4个阶段。不同破坏阶段滑坡的主要变形区域不同, 下层滑体受到上层滑体牵引作用, 在重力和推力作用下滑坡变形逐渐向浅层发展。变形过程中滑坡应力逐渐向滑带集中, 滑坡推力沿埋深方向呈多级梯形分布。加速变形阶段滑带处应力迅速增大, 滑坡体内产生多层应力集中带, 滑带位置推力变化与滑坡位移显著相关。
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| 关 键 词： | 物理模型试验 多层滑带滑坡 深部位移 变形演化 |
| 收稿时间： | 2021-03-25 |
Deformation and evolution characteristics of landslides with multiple sliding zones based on physical model test |
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| Abstract: | The deformation and evolution characteristics of landslides has always been a key problem to be solved in the field of landslide disaster prediction and prevention, but there are few studies on the deformation evolution characteristics of multiple sliding zone landslides. A physical model of landslides with three sliding zones has been developed to study the whole deformation evolution process of landslides with multiple sliding zones. To realize multiparameter data analysis of multiple sliding zone landslide evolution processes. The displacement data of the slope surface are obtained by PIV technology, and the deep displacement of the landslide is monitored by a flexible inclinometer. At the same time, the soil pressure box is arranged to obtain the change in the internal soil pressure of the landslide. The experimental results show that the failure of multiple sliding zone landslides can be divided into four stages: the initial deformation stage, uniform deformation stage, accelerated deformation stage and failure stage. The main deformation area of the landslide is different in different stages.The deformation of the lower sliding mass gradually develops to shallow depths under the action of gravity and thrust due to the traction of the upper sliding mass. During the deformation process, the stress of the landslide gradually concentrates to the sliding zone, and the landslide thrust presents a multilevel trapezoidal distribution in the direction of depth. During the accelerated deformation stage, the stress at the sliding zone increases rapidly, multilayer stress concentration zones occur in the landslide body, and the thrust change at the sliding zone position is significantly related to the landslide displacement. |
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