Although stability charts suggested by Hoek and Bray on the basis of Mohr-Coulomb criterion are used for rock slopes,but complete and precise recognition is required for distinguishing cohesive strength and Mohr-Coulo...Although stability charts suggested by Hoek and Bray on the basis of Mohr-Coulomb criterion are used for rock slopes,but complete and precise recognition is required for distinguishing cohesive strength and Mohr-Coulomb equivalent internal friction angle for rock mass.The paper by Lia et al.[6]is the only one that introduced rock slope charts according to Hoek-Brown failure criterion.In this paper,at first,this type of charts is introduced.Then,Mohr-Coulomb failure criterion charts[2]are compared and validated with Hoek-Brown failure criterion ones[6].Next,Bishop method utilizing Slide software is compared with Hoek-Brown failure criterion stability charts.Average standard deviation(ASD),root mean square error(RMSE)and variance account for(VAF)were used for the comparison.According to the results,because of high distribution and very low correlation among the comparisons,Hoek-Brown failure criterion charts are not efficient.展开更多
When the slope is in critical limit equilibrium(LE) state, the strength parameters have different contribution to each other on maintaining slope stability. That is to say that the strength parameters are not simultan...When the slope is in critical limit equilibrium(LE) state, the strength parameters have different contribution to each other on maintaining slope stability. That is to say that the strength parameters are not simultaneously reduced. Hence, the LE stress method is established to analyze the slope stability by employing the double strengthreduction(DSR) technique in this work. For calculation model of slope stability under the DSR technique, the general nonlinear Mohr–Coulomb(M–C) criterion is used to describe the shear failure of slope. Meanwhile, the average and polar diameter methods via the DSR technique are both adopted to calculate the comprehensive factor of safety(FOS) of slope. To extend the application of the polar diameter method, the original method is improved in the proposed method. After comparison and analysis on some slope examples, the proposed method's feasibility is verified. Thereafter, the stability charts of slope suitable for engineering application are drawn. Moreover, the studies show that:(1) the average method yields similar results as that of the polardiameter method;(2) compared with the traditional uniform strength-reduction(USR) technique, the slope stability obtained using the DSR techniquetends to be more unsafe; and(3) for a slope in the critical LE state, the strength parameter φ, i.e., internal friction angle, has greater contribution on the slope stability than the strength parameters c, i.e., cohesion.展开更多
基于塑性极限分析的运动单元法(kinematical element method)提出一种边坡稳定状况快速辨识方法。研究岩土体参数组合(坡高H、黏聚力c、内摩擦角和重度γ)与安全系数F和滑动面位置间的内在联系。在此基础上,绘制边坡稳定分析图,求解不...基于塑性极限分析的运动单元法(kinematical element method)提出一种边坡稳定状况快速辨识方法。研究岩土体参数组合(坡高H、黏聚力c、内摩擦角和重度γ)与安全系数F和滑动面位置间的内在联系。在此基础上,绘制边坡稳定分析图,求解不需要任何迭代,可快速求解安全系数和滑动面位置。根据边坡稳定分析图,提出一种新的参数反演方法。结果表明,无量纲参数c/(Htan)控制着滑动面位置和F/tan。λ不变,则滑动面位置和F/tan保持不变;λ越大,边坡失稳模式由浅层破坏变为深层破坏,滑动面坡顶滑出点离坡肩越来越远。当λ>0.2时,λ与F/tan符合线性关系,可用拟合公式快速计算安全系数。根据原始边坡形态和滑动面坡顶滑出点离坡肩的距离,即可快速反算滑带岩土体的黏聚力和内摩擦角。展开更多
文摘Although stability charts suggested by Hoek and Bray on the basis of Mohr-Coulomb criterion are used for rock slopes,but complete and precise recognition is required for distinguishing cohesive strength and Mohr-Coulomb equivalent internal friction angle for rock mass.The paper by Lia et al.[6]is the only one that introduced rock slope charts according to Hoek-Brown failure criterion.In this paper,at first,this type of charts is introduced.Then,Mohr-Coulomb failure criterion charts[2]are compared and validated with Hoek-Brown failure criterion ones[6].Next,Bishop method utilizing Slide software is compared with Hoek-Brown failure criterion stability charts.Average standard deviation(ASD),root mean square error(RMSE)and variance account for(VAF)were used for the comparison.According to the results,because of high distribution and very low correlation among the comparisons,Hoek-Brown failure criterion charts are not efficient.
基金funded by the National Natural Science Foundation of China (Grant No. 51608541)the Postdoctoral Science Foundation of China (Grant No. 2015M580702)the Guizhou Provincial Department of Transportation of China (Grant No. 2014122006)
文摘When the slope is in critical limit equilibrium(LE) state, the strength parameters have different contribution to each other on maintaining slope stability. That is to say that the strength parameters are not simultaneously reduced. Hence, the LE stress method is established to analyze the slope stability by employing the double strengthreduction(DSR) technique in this work. For calculation model of slope stability under the DSR technique, the general nonlinear Mohr–Coulomb(M–C) criterion is used to describe the shear failure of slope. Meanwhile, the average and polar diameter methods via the DSR technique are both adopted to calculate the comprehensive factor of safety(FOS) of slope. To extend the application of the polar diameter method, the original method is improved in the proposed method. After comparison and analysis on some slope examples, the proposed method's feasibility is verified. Thereafter, the stability charts of slope suitable for engineering application are drawn. Moreover, the studies show that:(1) the average method yields similar results as that of the polardiameter method;(2) compared with the traditional uniform strength-reduction(USR) technique, the slope stability obtained using the DSR techniquetends to be more unsafe; and(3) for a slope in the critical LE state, the strength parameter φ, i.e., internal friction angle, has greater contribution on the slope stability than the strength parameters c, i.e., cohesion.
文摘基于塑性极限分析的运动单元法(kinematical element method)提出一种边坡稳定状况快速辨识方法。研究岩土体参数组合(坡高H、黏聚力c、内摩擦角和重度γ)与安全系数F和滑动面位置间的内在联系。在此基础上,绘制边坡稳定分析图,求解不需要任何迭代,可快速求解安全系数和滑动面位置。根据边坡稳定分析图,提出一种新的参数反演方法。结果表明,无量纲参数c/(Htan)控制着滑动面位置和F/tan。λ不变,则滑动面位置和F/tan保持不变;λ越大,边坡失稳模式由浅层破坏变为深层破坏,滑动面坡顶滑出点离坡肩越来越远。当λ>0.2时,λ与F/tan符合线性关系,可用拟合公式快速计算安全系数。根据原始边坡形态和滑动面坡顶滑出点离坡肩的距离,即可快速反算滑带岩土体的黏聚力和内摩擦角。
