章校,阎长虹,郭书兰,等. 2021. 受暂时性承压水作用的山前缓坡稳定计算公式推求[J]. 工程地质学报,29(5):1507-1514. doi: 10.13544/j.cnki.jeg.2020-429.
    引用本文: 章校,阎长虹,郭书兰,等. 2021. 受暂时性承压水作用的山前缓坡稳定计算公式推求[J]. 工程地质学报,29(5):1507-1514. doi: 10.13544/j.cnki.jeg.2020-429.
    Zhang Xiao, Yan Changhong, Guo Shulan, et al. 2021. Derivation of stability formula of gentle slope affected by temporary confined water [J]. Journal of Engineering Geology, 29(5): 1507-1514. doi: 10.13544/j.cnki.jeg.2020-429.
    Citation: Zhang Xiao, Yan Changhong, Guo Shulan, et al. 2021. Derivation of stability formula of gentle slope affected by temporary confined water [J]. Journal of Engineering Geology, 29(5): 1507-1514. doi: 10.13544/j.cnki.jeg.2020-429.

    受暂时性承压水作用的山前缓坡稳定计算公式推求

    DERIVATION OF STABILITY FORMULA OF GENTLE SLOPE AFFECTED BY TEMPORARY CONFINED WATER

    • 摘要: 近年来,宁镇地区山前缓坡地带发生多起中-大型滑坡,该类缓坡具有特殊地质结构,即下部为透水性较好的碎石土、砂砾类土,而浅表地层为透水性相对较差的黏性土。强降雨条件下坡体内容易形成暂时性承压水,在暂时性承压水浮托力的作用下引发间歇性蠕动。本文根据宁镇地区山前缓坡的地层结构特点,对其构建了相应的水文地质模型,讨论了极端强降雨条件下缓坡中上部和中下部区域的受力特征,并基于Janbu法推导出缓坡的稳定性系数公式,最后以镇江跑马山边坡为例进行稳定性计算。研究结果表明,暂时性承压水对缓坡不同部位的影响差异较大,从本质上解释了缓坡发生滑动破坏的机理及传统极限平衡方法求得的安全系数不准确的原因。这一认识可以为宁镇地区山前缓坡稳定性评价及滑坡治理提供理论依据。

       

      Abstract: In recent years,there have been a number of medium-large landslides in Ningzhen area. It is found that the structure of this kind of gentle slope is special: The lower part is coarse-grained soil with good permeability,while the shallow stratum is clay soil with poor permeability. And it is easy to form temporaryly confined water with high head,which causes large-scale intermittent creep under the action of its buoyancy. According to the structural characteristics of the gentle slope in Ningzhen area,this paper constructs a new hydrogeological model,then analyses the different part's stress characteristics under extreme heavy rainfall. And then this paper derives its stability coefficient formula by Janbu method. Finally,this paper calculates and compares the stability coefficient of the Paoma Mountain's landslide under different confined water heads. The results show that the confined water has a big difference in different part of gentle slope,which essentially explains the cause of sliding failure and the inaccuracy of the stability coefficient obtained by the traditional limit equilibrium method. This recognition provides a theoretical basis for the stability evaluation and landslide control of the Piedmont gentle slope in Ningzhen area.

       

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