抗滑强度参数的取值对正确评估边坡稳定性有着重要影响,而参数反演是快速准确获取边坡抗滑强度参数的一种有效方法。基于边坡稳定性分析结果和滑动面抗滑强度参数与临界滑动面一一对应的关系,建立抗滑强度参数与边坡安全系数之间2个特定关系式;由此,在给定临界滑动面的安全系数或某一强度参数时,即可求解反演结果。为了便于计算,考虑多种因素影响,采用极限平衡瑞典法进行稳定性分析,并基于临界圆弧滑动面的判别,推导出参数反演的显示表达式。经算例对比分析,验证了该方法的可行性,且简单适用。同时,参数影响研究分析表明,临界滑动面上的监测点位间距越大,其点位位置误差对反演强度参数的影响越小。最后,将方法应用于工程实例当中,说明了该方法的实用性。
Abstract
The values of anti-slide strength parameters have important influence on the calculation of slope stability, and back analysis is an effective method to obtain the anti-slide strength parameters quickly and accurately. In this article, two specific equations for anti-slide strength parameters and factor of safety are established based on the results of slope stability analysis and the relationship between anti-slide strength parameters and the corresponding critical slip surface. Thus the results of back analysis can be obtained when the factor of safety or a strength parameter is known for the given critical slip surface. For the sake of convenient calculation, the explicit expressions for back analysis of parameters are deduced by adopting the limit equilibrium Swedish method to analyze slope stability in consideration of a variety of factors. Furthermore, the critical slip surface is assumed to be circular and is determined by survey methods. Through comparison with some examples, the correctness of this method is verified. Moreover, researches on the parameter analysis show that the larger spacing of monitoring sites on critical slip surface, the smaller effect of position error of monitoring sites on the inversion result. Application of the present method to engineering example illustrates its practicability.
关键词
临界滑动面 /
安全系数 /
边坡稳定性 /
强度 /
参数反演 /
极限平衡
Key words
critical slip surface /
factor of safety /
slope stability /
strength parameters /
back analysis /
limit equilibrium
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基金
国家自然科学基金项目(51608541);中国博士后科学基金面上项目(2015M580702);贵州省交通运输厅科技项目(2010-122-020, 2014-122-006)
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