膨胀土边坡浅层破坏稳定性分析

发布时间：2018-07-26 18:42

【摘要】：应用南宁膨胀土开展低应力下的常规饱和慢剪、固结快剪、快剪试验,获得了抗剪强度随竖向应力的变化规律,分析了低应力对抗剪强度的影响。进行了75、100、200、300kPa竖向压力下的残余强度试验,运用Seep/W和Slope/W软件,考虑降雨入渗条件,采用M-P、Ordinary和Bishop三种极限平衡法对各抗剪强度下膨胀土边坡的稳定性进行对比分析。分析结果表明:各抗剪强度受低应力的影响显著,均呈非线性,可用幂函数表达;饱和慢剪强度在低应力时最小,高应力时最大;采用含低应力饱和非线性慢剪强度进行边坡稳定分析结果与实际发生的浅层破坏吻合。
[Abstract]:In this paper, the conventional saturated slow shear, consolidation fast shear and fast shear tests are carried out on Nanning expansive soil under low stress. The variation of shear strength with vertical stress is obtained, and the influence of low stress on shear strength is analyzed. The residual strength test under vertical pressure of 75100200300kPa was carried out. The stability of expansive soil slope under different shear strength was analyzed by using M-Pordinary and Bishop limit equilibrium method considering rainfall infiltration condition by Seep/W and Slope/W software. The results show that the shear strength is significantly influenced by low stress and is nonlinear and can be expressed by power function, and the saturated slow shear strength is the smallest at low stress and the maximum at high stress. The results of slope stability analysis with low stress saturation nonlinear slow shear strength are in agreement with the actual shallow failure.
【作者单位】：长沙理工大学道路灾变防治及交通安全教育部工程研究中心;
【基金】：国家自然科学基金项目(50978035,51108049) 交通运输部科技项目(2009 353 311 060) 道路灾变防治及交通安全教育部工程研究中心开放基金项目(kfi090303) 广西交通科技项目(2011-20)
【分类号】：U416.14

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