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基于物理模型试验的多层滑带滑坡变形演化特征

杨登芳 胡新丽 徐楚 王强 牛李飞 张杰豪

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. doi: 10.19509/j.cnki.dzkq.2021.0069
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. doi: 10.19509/j.cnki.dzkq.2021.0069
Yang Dengfang, Hu Xinli, Xu Chu, Wang Qiang, Niu Lifei, Zhang Jiehao. Deformation and evolution characteristics of landslides with multiple sliding zones based on physical model test[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 300-308. doi: 10.19509/j.cnki.dzkq.2021.0069
Citation: Yang Dengfang, Hu Xinli, Xu Chu, Wang Qiang, Niu Lifei, Zhang Jiehao. Deformation and evolution characteristics of landslides with multiple sliding zones based on physical model test[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 300-308. doi: 10.19509/j.cnki.dzkq.2021.0069

基于物理模型试验的多层滑带滑坡变形演化特征

doi: 10.19509/j.cnki.dzkq.2021.0069
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

详细信息
    作者简介:

    杨登芳(1996-), 女, 现正攻读土木工程专业硕士学位, 主要从事地质灾害防治研究工作。E-mail: 1308173834@qq.com

    通讯作者:

    胡新丽(1968-), 女, 教授, 博士生导师, 主要从事岩土工程数值模拟与稳定性评价方面的研究工作。E-mail: huxinli@cug.edu.cn

  • 中图分类号: P642.22

Deformation and evolution characteristics of landslides with multiple sliding zones based on physical model test

  • 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。

     

  • 图 1  模型框架图

    M1.浅层滑体; M2.中层滑体; M3.深层滑体; S1.浅层滑带; S2.中层滑带; S3.深层滑带

    Figure 1.  Frame diagram of the landslide model

    图 2  推力设计加载曲线

    Figure 2.  Loading curve of thrust design

    图 3  监测布置

    Figure 3.  Layout of sliding body detection

    图 4  典型监测点与加载的时间序列

    Figure 4.  Relationship between typical monitoring points and loading time sequence

    图 5  试验过程宏观变形

    Figure 5.  Curve of rate accumulative displacement

    图 6  累计位移速率曲线

    Figure 6.  Curve of rate accumulative displacement

    图 7  深部累计位移曲线

    Figure 7.  Curve of deep accumulative displacement

    图 8  相对位移-时间曲线

    Figure 8.  Curve of relative displacement -time

    图 9  相对位移速率曲线

    Figure 9.  Curve of relative displacement rate

    图 10  3层滑带滑坡后缘、中部和前部土压力深度变化曲线(括号中为推力)

    Figure 10.  Depth variation curve of earth pressure at trailing edge, middle and front

    图 11  单层滑带滑坡后缘、中部和前缘土压力深度变化[30]

    Figure 11.  Variation in earth pressure depth in the rear, middle and front of a single-layer sliding zone landslide

    图 12  不同阶段土压力分布云图

    Figure 12.  Nephogram of earth pressure distribution in different stages

    表  1  模型材料基本参数

    Table  1.   Basic parameters of model materials

    容重/(g·cm-3) 黏聚力/kPa 摩擦角/(°) 含水率/%
    滑体 1.69 20.6 21.8 8
    滑带 1.63 1.2 20.2 8
    下载: 导出CSV
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