A Revised Formula to Compute Shear Strength of Unsaturated Soils

A Revised Formula to Compute Shear Strength of Unsaturated Soils
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非饱和土抗剪强度计算的修正公式

DOI:
10.15273/ijge.2017.01.006
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发表时间:
2017
期刊:
International Journal of Georesources and Environment
影响因子:
--
通讯作者:
Shiyang Chen
Shiyang Chen
中科院分区:
其他
文献类型:
--
作者:
Huajin Li;Wenkai Feng;Qiang Xu;Yusen He;Boyu Luo;Shiyang Chen

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四川西部杂谷脑河流域沿着广泛分布着冰碛。高海拔地区的冰碛在降水的影响下不断变形。它被认为是对当地社区的严重威胁。通过现场地质调查和室内实验,观察了不同饱和度下冰碛物的敏感性。粘聚力和内摩擦角与冰碛物的饱和度呈负相关关系。传统的非饱和土力学强度模型不能很好地解释非饱和土的力学特性。提出了一个修正的莫尔-库仑准则公式,并在此基础上增加了粘聚力补偿。修正后的强度准则能较准确地预测角砾岩的强度,对特殊类型角砾岩的进一步研究具有一定的参考价值。
In the western part of Sichuan province of China, moraines are widely distributed along the Valley of Zagunao River. The moraines at high altitude have deformed constantly under the influence of precipitation. It is considered as a severe threat to the local community. By on-site geological investigation and lab experiments, the sensitivities of moraines under different saturation rates are observed. The cohesion and friction angle both have negative correlations with the saturation rates of the morainic materials. Traditional mechanical strength models for unsaturated soil analysis failed to explain the mechanical characteristics explicitly. A revised Mohr-Coulomb criterion formula with an added cohesive compensation is proposed in this research to compute the unsaturated strength. The revised criterion accurately predicts the strength and is valuable for future research of special types of breccia.
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