基于强度储备的边坡非等比例双安全系数研究

发布时间：2018-03-03 20:27

  本文选题：强度储备　切入点：应变软化　出处：《岩土力学》2016年04期 　论文类型：期刊论文

【摘要】：边坡的失稳过程是一个渐进性的累积破坏过程。在破坏过程中抗剪强度参数黏聚力c、内摩擦角?的发挥程度是不同的,对应的安全储备也就不同,那么基于强度储备的双安全系数确定及其基于双安全系数的边坡稳定性评价就值得深入探讨。首先从岩土材料的软化规律出发,在强度参数服从线性分布假定的基础上,推导了黏聚力折减系数和内摩擦角折减系数之间的数学关系;其次将此数学表达式引入到传统的Bishop条分法中,提出了非等比例双安全系数Bishop条分法;然后以强度参数对抗滑力的贡献为权重,提出了综合安全系数来评价边坡的稳定性;此方法不仅克服了传统双安全系数法确定双安全系数的盲目性,而且为双安全系数法应用于工程实践提供了新途径;最后结合算例通过与传统方法的计算结果进行对比分析,验证了该方法的合理性。
[Abstract]:The failure process of slope is a gradual cumulative failure process. The level of exertion is different, and the corresponding safety reserve is also different. Therefore, the determination of double safety factor based on strength reserve and the evaluation of slope stability based on double safety factor are worth further discussion. Firstly, based on the softening law of geotechnical materials and the assumption of linear distribution of strength parameters, The mathematical relationship between cohesive force reduction coefficient and internal friction angle reduction coefficient is derived. Secondly, this mathematical expression is introduced into the traditional Bishop strip method, and a non-equal proportion double safety factor Bishop slice method is proposed. Then taking the contribution of strength parameter against sliding force as the weight, a comprehensive safety factor is put forward to evaluate the slope stability, which not only overcomes the blindness of the traditional double safety factor method to determine the double safety factor. It also provides a new way for the double safety factor method to be applied in engineering practice. Finally, the rationality of the method is verified by comparing the calculation results with those of the traditional method.
【作者单位】： 西安理工大学岩土工程研究所;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：陕西省科技统筹创新工程重点实验室项目(No.2014SZS15-Z01) 水利部公益性行业科研专项基金资助项目(No.201501034-04) 高等学校博士学科点专项科研基金项目(No.20126118110014)~~
【分类号】：TU43
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本文编号：1562592