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    三峡库区马家沟滑坡模型形态概化

    吴丹丹 胡新丽 雍睿 祝廷尉 李蕊

    吴丹丹, 胡新丽, 雍睿, 祝廷尉, 李蕊, 2014. 三峡库区马家沟滑坡模型形态概化. 地球科学, 39(11): 1593-1598,1634. doi: 10.3799/dqkx.2014.152
    引用本文: 吴丹丹, 胡新丽, 雍睿, 祝廷尉, 李蕊, 2014. 三峡库区马家沟滑坡模型形态概化. 地球科学, 39(11): 1593-1598,1634. doi: 10.3799/dqkx.2014.152
    Wu Dandan, Hu Xinli, Yong Rui, Zhu Tingwei, Li Rui, 2014. Generalizability Method of Physical Model Shape for Majiagou Landslide in Three Gorges Reservoir Area. Earth Science, 39(11): 1593-1598,1634. doi: 10.3799/dqkx.2014.152
    Citation: Wu Dandan, Hu Xinli, Yong Rui, Zhu Tingwei, Li Rui, 2014. Generalizability Method of Physical Model Shape for Majiagou Landslide in Three Gorges Reservoir Area. Earth Science, 39(11): 1593-1598,1634. doi: 10.3799/dqkx.2014.152

    三峡库区马家沟滑坡模型形态概化

    doi: 10.3799/dqkx.2014.152
    基金项目: 

    国家重点基础研究发展计划"973"计划项目 2011CB710604

    详细信息
      作者简介:

      吴丹丹(1988-), 女, 硕士研究生, 主要从事岩土体稳定性评价及数值模拟方面研究.E-mail: WuddCUG@163.com

      通讯作者:

      胡新丽, E-mail: huxinli2000@163.com

    • 中图分类号: P554

    Generalizability Method of Physical Model Shape for Majiagou Landslide in Three Gorges Reservoir Area

    • 摘要: 以三峡库区秭归县马家沟滑坡I号滑体为例, 为研究其在库水位升降和降雨条件下的变形破坏及稳定性, 对其采用框架式模型试验, 参照1∶40相似比进行了缩放.以模型概化前后滑坡稳定性系数相一致为目的, 在2.0m×1.0m×1.5m的试验框架内, 通过改变抗滑桩前的滑体、滑带的几何形态, 建立了与研究对象应力边界条件一致的地质力学模型.概化后对滑坡桩前边界推力和研究区后边界推力进行拟合, 得出相应于实际滑坡在不同水位时边界推力的折减系数.通过调节水位的升降速率来保证在水位变化时滑坡概化前后稳定性系数等效, 数值模拟结果显示滑坡模型的水位变化速率为0.7m/d、水位在183~204m范围内升降满足模拟实际滑坡水位在145~175m间变动的情况, 从而也验证了滑坡概化后模型的合理性.

       

    • 图  1  马家沟滑坡Ⅰ号滑体模型基准剖面及研究区

      Fig.  1.  The profile and the study area of the Ⅰ slip mass of Majiagou landslide model

      图  2  滑坡模型概化技术路线

      Fig.  2.  Technical route of landslide model generalization

      图  3  桩前滑体概化条分图

      1.滑坡前缘端点,剪出口位置;2、3.桩距滑坡前缘端点水平距离的中轴线上的点

      Fig.  3.  Slices of slip mass in front of piles

      图  4  桩前滑体概化条分图

      Fig.  4.  Profile of the generalized model

      图  5  概化后滑坡桩前边界推力(水位高程>187m)拟合

      Fig.  5.  Profile of the generalized model

      图  6  概化后研究区后边界推力(水位高程>193.4m)

      Fig.  6.  The fitting curve ofresidual thrust of the back boundary of the research area for the generalized model

      图  7  实际滑坡剖面

      Fig.  7.  The profile of the actual landslide

      图  8  概化后的滑坡模型剖面

      Fig.  8.  The profile of the generalized model

      图  9  不同水位变化速率下的滑坡稳定性系数

      Fig.  9.  Stability coefficients of different change rates of water level

      图  10  稳定性系数折减后不同水位变化速率下的滑坡稳定性系数(折减系数为1.025)

      Fig.  10.  Stability coefficients after the reduction(the factor is 1.025) of different change rates of water level

      表  1  静水位条件下实际滑坡稳定性系数

      Table  1.   Stability coefficients of the landslide under static water level

      水位高程(m) 稳定性系数
      无水 1.213 7
      145 1.190 9
      150 1.195 9
      155 1.221 3
      160 1.250 7
      165 1.304 0
      170 1.383 4
      175 1.503 7
      下载: 导出CSV

      表  2  静水位条件下概化模型的稳定性系数

      Table  2.   Stability coefficients of the generalized model under static water level

      剪出口高程(m) 不同水位高程(m)下稳定性系数
      无水 185 190 195 200
      180 1.213 7 1.179 1.187 1.219 1.279
      181 1.213 7 1.201 1.238 1.133 1.120
      182 1.213 7 1.196 1.198 1.224 1.286
      183 1.213 7 1.197 1.267 1.374 1.511
      184 1.213 7 1.192 1.236 1.324 1.445
      185 1.213 7 0.920 0.817 0.737 0.676
      下载: 导出CSV

      表  3  概化前后滑坡剩余推力对比

      Table  3.   Correlation table of residual thrust of the landslide and the generalized model

      状态 水位高程(m) 桩前剩余推力(kN/m) 研究区后边界推力(kN/m)
      概化前滑坡 无水 1 586.40 1 915.34
      145.0 1 586.40 1 915.34
      150.0 1 586.40 1 915.34
      155.0 1 586.40 1 915.34
      160.0 1 586.40 1 915.34
      165.0 1 586.40 1 915.34
      170.0 1 586.40 1 915.34
      175.0 1 586.40 1 915.34
      概化后滑坡 无水 1 586.40 1 915.34
      183.0 1 586.40 1 915.34
      185.0 1 586.40 1 915.34
      187.0 1 586.40 1 915.34
      190.0 1 626.36 1 915.34
      193.4 1 750.81 1 915.34
      195.0 1 877.87 2 173.29
      200.0 2 197.57 2 439.16
      下载: 导出CSV
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    • 收稿日期:  2014-04-02
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