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均质边坡稳定状况快速辨识及参数反演的一种实用方法

ISSN号：1672-7207
期刊名称：《中南大学学报：自然科学版》
时间：0
分类：TU443[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]中南大学资源与安全工程学院,湖南长沙410083
相关基金：国家自然科学基金资助项目（10972238,51174228）; 高等学校博士学科点专项科研基金资助项目（20120162110009）; 湖南省研究生科研创新项目（CX2012B069）

关键词：边坡稳定, 运动单元法, 临界滑动面, 稳定分析图, 参数反演, slope stability, KEM, critical slip surface, slope stability chart, parameter inversion

中文摘要：

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。

英文摘要：

A new fast identification of slope stability state based on KEM（kinematical element method） was presented.The internal relationship between combination of rock and soil parameters（slope height H,cohesion c,friction angle and unit weight γ） and stability state（factor of safety F and location of critical slip surface） was studied.The slope stability charts were developed,and a rapid and reliable way was provided to calculate the factor of safety and the location of critical slip surface without iteration.Based on the above slope stability charts,a new parameters inversion method was presented.The result shows that the location of critical slip surface and F / tan are determined by dimensionless parameter c /（Htan）.If λ remains constant,the location of critical slip surface and F / tan remain the same.As λ increases,the failure mode changes from shallow slip to deep slip,and the horizontal distance from the toe of the slope to the failure surface at crest is much farther.When λ0.2,the relationship between λ and F / tan is linear,and the factor of safety can be calculated fast by the fitting formulas.With the slope geometry and the horizontal distance from the toe of the slope to the failure surface at crest in a specific cross-section,strength parameters of landslide slip can be obtained through back-calculation.

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