黄土完全软化强度与残余强度的对比试验研究

强菲 李萍 李同录

强菲, 李萍, 李同录. 2014: 黄土完全软化强度与残余强度的对比试验研究. 工程地质学报, 22(5): 832-838. doi: 10.13544/j.cnki.jeg.2014.05.09
引用本文: 强菲, 李萍, 李同录. 2014: 黄土完全软化强度与残余强度的对比试验研究. 工程地质学报, 22(5): 832-838. doi: 10.13544/j.cnki.jeg.2014.05.09
QIANG Fei, LI Ping, LI Tonglu. 2014: COMPARATIVE TEST STUDY BETWEEN FULLY SOFTENED AND RESIDUAL STRENGTHS OF LOESS. JOURNAL OF ENGINEERING GEOLOGY, 22(5): 832-838. doi: 10.13544/j.cnki.jeg.2014.05.09
Citation: QIANG Fei, LI Ping, LI Tonglu. 2014: COMPARATIVE TEST STUDY BETWEEN FULLY SOFTENED AND RESIDUAL STRENGTHS OF LOESS. JOURNAL OF ENGINEERING GEOLOGY, 22(5): 832-838. doi: 10.13544/j.cnki.jeg.2014.05.09

黄土完全软化强度与残余强度的对比试验研究

doi: 10.13544/j.cnki.jeg.2014.05.09
基金项目: 

国家自然科学基金项目(40772181)资助

详细信息
    作者简介:

    强菲,女,博士,从事黄土边坡工程研究. Email: 382671887@qq.com

  • 中图分类号: TU443

COMPARATIVE TEST STUDY BETWEEN FULLY SOFTENED AND RESIDUAL STRENGTHS OF LOESS

  • 摘要: 为了解决复活蠕滑型黄土滑坡强度参数的取值问题,开展完全软化强度与残余强度的对比试验研究。以山西地区典型黄土为研究对象,采用预压固结法制备饱和重塑试样,并进行反复直剪强度试验获取完全软化强度和残余强度参数。试验结果表明:黄土的完全软化强度以黏聚力为零、颗粒未发生定向排列为主要特征。完全软化强度与二次固结应力和黏粒含量有关。试样在二次固结应力小于300kPa时的应力-应变曲线呈应变软化型,完全软化强度大于残余强度,黏粒含量高的试样应变软化更显著; 试样在二次固结应力大于等于300kPa时的应力应变曲线呈理想塑性型,完全软化强度近似等于残余强度。完全软化内摩擦角与残余内摩擦角的差值和预压固结应力、二次固结应力及黏粒含量有关。完全软化内摩擦角与残余内摩擦角的差值随二次固结应力的增大而减小,最终趋于0。当预压固结应力小于300kPa时,内摩擦角差值及黏粒含量对内摩擦角差值的影响随着预压固结应力的减小呈乘幂性增大; 当预压固结应力大于等于300kPa时,完全软化强度近似等于残余强度,可用完全软化强度近似代替残余强度。研究结论为复活蠕滑型黄土滑坡稳定性分析时强度参数的取值提供了一定的参考。
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出版历程
  • 收稿日期:  2014-05-30
  • 修回日期:  2014-08-25
  • 刊出日期:  2014-10-25

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