土质边坡归一化变形量失稳判据研究

发布时间：2018-04-30 11:27

本文选题：土质边坡 + 归一化变形量　；参考：《长江科学院院报》2017年10期

【摘要】：为建立土质边坡失稳的微观机理和宏观位移之间的关系,应用有限元强度折减法,分析了失稳过程中土质边坡土体单元应力状态和整体稳定性的联系,定义了边坡渐进破坏时潜在滑动面上土体单元的应力差;分别采用塑性应变区贯通、特征点位移突变、应力差等不同失稳判据对均质土坡的稳定性进行判断分析,验证了不同边坡失稳判据间的一致性与统一性。通过单因素敏感性分析方法,分析了边坡几何参数(坡高、坡比)与物理力学参数(弹性模量、重度、黏聚力、内摩擦角和泊松比等)对极限状态下边坡坡顶水平位移的影响;结合归一化变量的变异系数法,构建了以变形量为基础,同时考虑几何因素与物理因素的土质边坡归一化失稳判据,提出了边坡稳定性的评价方法。
[Abstract]:In order to establish the relationship between the micro-mechanism of soil slope instability and macroscopic displacement, the relationship between the stress state of soil element and the overall stability of soil mass in the process of instability is analyzed by using the finite element strength reduction method. In this paper, the stress difference of soil element on the potential sliding surface during the progressive failure of slope is defined, and the stability of homogeneous soil slope is judged and analyzed by using different criteria such as plastic strain zone transfixion, displacement abrupt change of characteristic point, stress difference and so on. The consistency and unity of different slope instability criteria are verified. Through single factor sensitivity analysis, the effects of slope geometric parameters (slope height, slope ratio) and physical and mechanical parameters (modulus of elasticity, weight, cohesion, angle of internal friction and Poisson's ratio) on slope top horizontal displacement under limit state are analyzed. Combined with the coefficient of variation method of normalized variables, a criterion of normalized instability of soil slope based on deformation and geometric and physical factors is established, and the evaluation method of slope stability is put forward.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;中铁第一勘察设计院集团有限公司;中国公路工程咨询集团有限公司;河海大学江苏省岩土工程技术工程研究中心;
【基金】：国家自然科学基金项目(41530637,51578214) 中央高校基本科研业务费专项资金项目(2015B17714) 中国交通建设股份有限公司科技研发项目(2012-ZJKJ-11)
【分类号】：TU43

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