Reliability Analysis of Slope Deformation Stability Based on Strength Reduction Method and Random Response Surface Method
候建琴 HOU Jian-qin
（上饶市弋阳县水利局，上饶 334400）
（Yiyang County Water Resources Bureau，Shangrao City，Shangrao 334400，China）
摘要：为了合理考虑土体多参数不确定性对边坡变形稳定的影响，本文提出了基于强度折减法和随机响应面的边坡变形稳定可靠度分析方法，并通过一个边坡案例验证了提出方法的有效性。计算结果表明：强度折减法可以考虑土体多参数（黏聚力、内摩擦角、弹性模量和泊松比）对边坡变形稳定的影响。基于随机响应面模型计算的边坡位移值与强度折减法结果基本一致，随机响应面模型可以替代复杂耗时的边坡变形有限元分析，为解决考虑参数不确定性的边坡可靠度问题提供了一个有效的工具。同时，边坡最大位移出现在坡脚位置，故而在工程监测中应当优先考虑该监测点的布置。此外，研究中也应该充分考虑边坡系统效应的影响，以更好地评估边坡变形稳定性。
Abstract: In order to reasonably consider the effects of soil multi-parameter uncertainties on the slope deformation stability, this paper proposes a slope deformation stability reliability analysis method based on strength reduction method and random response surface, and a slope is adopted as an example to verify the effectiveness of proposed method. The calculation results show that the strength reduction method can take into account the influence of multiple parameters of the soil (cohesion, internal friction angle, elasticity modulus and poisson ratio) on the deformation stability of slope. The slope displacements calculated by the random response surface model are in general agreement with the results of strength reduction method. The random response surface model can replace the complex and time-consuming finite element analysis of slope deformation, which would provide an effective tool for solving the problem of slope reliability considering uncertainties of soil properties. Meanwhile, the maximum displacement of slope occurs at the foot of the slope, so the placement of this monitoring point should be given priority in project engineering. Moreover, the influences of slope system should be fully considered in researches to better assess the deformation stability of slope.
关键词：边坡；强度折减法；随机响应面法；可靠度
Key words: slope；strength reduction method；random response surface method；reliability
中图分类号：[TV221.2] 文献标识码：A 文章编号：1006-4311（2024）28-109-04 doi:10.3969/j.issn.1006-4311.2024.28.033
|
