李喜安, 黄润秋, 李荣建, 李亮. 2014: 暗穴环境下非饱和黄土边坡稳定性分析. 工程地质学报, 22(3): 366-371. DOI: 10.13544/j.cnki.jeg.2014.03.003
    引用本文: 李喜安, 黄润秋, 李荣建, 李亮. 2014: 暗穴环境下非饱和黄土边坡稳定性分析. 工程地质学报, 22(3): 366-371. DOI: 10.13544/j.cnki.jeg.2014.03.003
    LI Xi'an, HUANG Runqiu, LI Rongjian, LI Liang. 2014: FEM STABILITY ANALYSIS OF LOESS SLOPE WITH TUNNELING EROSION. JOURNAL OF ENGINEERING GEOLOGY, 22(3): 366-371. DOI: 10.13544/j.cnki.jeg.2014.03.003
    Citation: LI Xi'an, HUANG Runqiu, LI Rongjian, LI Liang. 2014: FEM STABILITY ANALYSIS OF LOESS SLOPE WITH TUNNELING EROSION. JOURNAL OF ENGINEERING GEOLOGY, 22(3): 366-371. DOI: 10.13544/j.cnki.jeg.2014.03.003

    暗穴环境下非饱和黄土边坡稳定性分析

    FEM STABILITY ANALYSIS OF LOESS SLOPE WITH TUNNELING EROSION

    • 摘要: 黄土暗穴在水土流失方面作为一种独特的侵蚀方式,往往会威胁到建设在非饱和黄土层之上的公路边坡稳定性。基于考虑基质吸力的强度折减有限元程序,本文通过开展不同位置暗穴、单双暗穴和基质吸力赋存与丧失等条件下边坡稳定性的对比研究,着重对影响边坡稳定性的暗穴、基质吸力等因素进行了研究。研究结果表明,当暗穴接近地表时由于存在一定的减载效应而利于坡体的稳定,而当暗穴接近边坡坡脚时则成为黄土边坡稳定性的不利因素,在边坡底部存在的双暗穴明显削弱了边坡的稳定性,基质吸力使得非饱和黄土边坡安全系数增大,潜在滑动面变深,反之则使安全系数减小,潜在滑动面上移,基质吸力的丧失或减小以及暗穴的削弱作用使得潜在滑动面位置变化较大。

       

      Abstract: The tunneling erosion is not only a unique mode of soil erosion,but also usually an important factor to the stability of the highway slopes of unsaturated loess in the loess plateau. Based on the developed program of the strength reduction FEM with matric suction,this paper comparatively studies the different cases of the unsaturated loess slope stabilities. The results reveal the possible different effects on the stability of unsaturated loess slope by erosion tunneling as well as matric suction. The results indicate that when their occurrence nears the slope crest,the tunnel erosions prefer to maintain the stability of the slope. On the contrary,when their occurrence nears the slope toe,the tunnel erosions prefer to reduce the stability of slope especially as the tunneling is serious. The results also indicate that the safety factor of the unsaturated loess slope increases and the potential sliding surface moves downward when the matric suction is considered,while the safety factor of the unsaturated loess slope decreases and the potential sliding surface moves upward when the matric suction is ignored.

       

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