基于双强度折减幅值加权法的公路边坡稳定性研究  

Study on Stability of Highway Slope Based on Double Reduction Method with Amplitude Weighting

作　　者：武博强 李博 WU Bo-qiang;LI Bo(CCCC First Highway Consultants Co.,Ltd.,Xi’an Shaanxi 710065,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710065

出　　处：《公路交通科技》2023年第9期75-81,90,共8页Journal of Highway and Transportation Research and Development

基　　金：国家重点研发计划课题项目(2016YFC0802203)。

摘　　要：基于双强度折减法(DRM)的研究现状,提出了两个需要进一步深化的问题,一是DRM在多岩土层边坡的应用性如何,二是寻找一种准确且方便快捷的最终边坡稳定系数的确定方法。据此提出了折减幅值加权的双强度折减法,以内蒙古某高等级公路多岩土层深挖路堑高边坡为研究对象进行了研究分析。首先,阐明了双强度折减法在实际工程中的研究思路,推导了DRM边坡最终稳定系数的计算模型。其次,以K2+550-K3+150挖方段典型高边坡为例进行双强度折减法分析,叙述了双强度折减幅值加权法的实现过程,并与极限平衡法以及常用的3种双强度折减法模型计算结果进行了对比。为进一步验证方法的普遍适用性及准确性,采用了澳大利亚ACADS协会的均质边坡算例,采用多种方法对3组不同抗剪强度参数下边坡的稳定性计算结果进行了对比。结果表明:边坡最终稳定系数为1.281,与极限平衡法的计算结果相差2.18%,其他双强度折减法最终边坡稳定系数结果均偏大;折减幅值加权的强度折减法每次计算结果均与实际情况相近,其他双强度折减法确定的最终边坡稳定系数计算结果较离散;折减幅值加权的双强度折减法计算结果更符合实际工程,完全可以运用到实际边坡分析中,并且除稳定系数外还有剪应变增量及位移等综合判据,具有普遍适用性和较高的准确性。According to the study status of double reduction method(DRM),two issues are put forward to be further deepened.The first is the application of DRM in multiple rock and soil layer slope,and the other is to find an accurate and convenient method to determine the final slope stability coefficient.Based on this,the new DRM based on the weighted reduction amplitude is proposed,and study the slope of deep excavation in multiple rock and soil layer of the highway in Inner Mongolia.First,the study idea of DRM in practical engineering is clarified,and the calculation model of the final stability coefficient of the slope by DRM is derived.Second,taking the typical high slope of K2+550-K3+150 excavation section for an example,the DRM is analyzed,and the realization process of the DRM with amplitude weighting is described,and the calculation result of the limit balance method and the commonly used three DRM are compared.In order to further verify the universal applicability and accuracy of the method,the homogeneous slope study of ACADS Association of Australia is used to compare the stability calculation results of slopes under three sets of different shear strength parameters by various methods.The result shows that(1)the final stability coefficient of the slope is 1.281,which is 2.18%different from the calculation result of the limit balance method,and the final slope stability coefficient results of other double intensity reduction methods are large;(2)the calculation result of the intensity reduction method weighted by the reduction amplitude is similar to the actual situation each time,and the final slope stability coefficient calculation results determined by other DRM are more discrete;(3)the calculation results of the DRM weighted by the reduction amplitude are more in line with the actual engineering and can be fully applied to the actual slope analysis,and in addition to the stability coefficient,there are comprehensive criteria such as shear strain increment and displacement,which have universal applicability an

关 键 词：道路工程 折减幅值加权 双强度折减法 多岩土层 折减系数 

分 类 号：TU452[建筑科学—岩土工程]