滑坡抗剪强度参数反演方法研究

发布时间：2018-07-06 16:59

本文选题：边坡工程 + 抗剪强度参数　；参考：《中南大学》2014年硕士论文

【摘要】：滑坡灾害给社会的可持续发展和人们的生命财产带来严重的威胁。滑坡灾害的频繁发生以及加固处治资金的大量投入,使得滑坡灾害的研究成为热点和难点问题。而岩土体的抗剪强度参数c和φ值是边坡稳定性分析评价和滑坡处置设计的基础,抗剪强度参数的取值成为影响边坡稳定性分析结果可靠度的关键。因此,研究c和φ值的确定方法对边坡工程的分析与设计具有重要的实际意义。反演分析采用的边坡稳定性分析模型不同,反算得到的强度参数值也会有所差异。目前国内外边坡稳定性分析最常用的方法为极限平衡条分法,其中传递系数法在折线形滑面边坡的应用最为广泛。本文以垂直分条折线形滑面边坡作为计算模型,考虑孔隙水压力的影响,运用传递系数法反算滑面强度参数c、φ值。鉴于极限分析上限定理考虑了岩土体材料的应力——应变关系,又较之传递系数法具有严格的理论基础,本文提出了基于极限分析上限法的强度参数反演分析新方法。由于自然界发生的滑坡绝大多数呈三维形态,而且部分滑坡体的三维效应极为明显。而二维分析只是对滑坡体行为的逼近模拟,忽略了滑坡体的侧向约束作用,不能反映滑坡体的实际形态,故本文将二维边坡极限分析扩展为三维极限分析,并将二、三维反演结果进行对比分析。传统的确定性边坡稳定性分析方法未能考虑岩土参数的随机性和不确定性对边坡稳定性的影响,因此本文将概率可靠度理论和反分析方法相结合,提出了一种简单实用的滑坡强度参数反演新方法。通过湘西朱雀洞滑坡工程实例反演结果的对比分析表明,基于二维、三维边坡极限分析方法、概率可靠度理论方法和传统的传递系数法的边坡滑面强度参数反演结果具有较好的一致性,并与现场勘测试验值吻合良好,验证了本文提出的滑坡强度参数反演新方法的有效性。三维极限分析上限法反演的强度参数比二维极限分析方法的反演结果小,体现了滑坡体的侧向约束作用,反演结果更能反映滑坡的真实情况。
[Abstract]:Landslide disaster brings serious threat to the sustainable development of society and people's life and property. The frequent occurrence of landslide disasters and the investment of funds for strengthening and treating make the research of landslide disasters become a hot and difficult problem. The shear strength parameters c and 蠁 of rock and soil are the basis of slope stability analysis and design, and the value of shear strength is the key to the reliability of slope stability analysis. Therefore, it is of great practical significance to study the determination method of c and 蠁 values for the analysis and design of slope engineering. Different slope stability analysis models are used in inverse analysis, and the values of strength parameters obtained by inverse calculation will also be different. At present, the most commonly used method of slope stability analysis at home and abroad is the limit equilibrium strip method, among which the transfer coefficient method is the most widely used in the slope of the zigzag slip surface. In this paper, the vertical zigzag slope is used as the calculation model, considering the influence of pore water pressure, the strength parameters c, 蠁 of the slip surface are calculated by transfer coefficient method. Since the upper limit theorem of limit analysis takes into account the stress-strain relationship of rock and soil materials and has a strict theoretical basis compared with the transfer coefficient method, a new method for inverse analysis of strength parameters based on the upper limit method of limit analysis is proposed in this paper. Most of the landslides occurring in nature show three-dimensional shape, and the three-dimensional effects of some landslide bodies are very obvious. The two-dimensional analysis is only the approximation simulation of the landslide behavior, neglecting the lateral constraint of the landslide, and can not reflect the actual form of the landslide, so this paper extends the two-dimensional slope limit analysis to three-dimensional limit analysis. The results of three-dimensional inversion are compared and analyzed. The traditional deterministic slope stability analysis method fails to consider the influence of randomness and uncertainty of rock and soil parameters on slope stability, so the probability reliability theory and the inverse analysis method are combined in this paper. A simple and practical method for inversion of landslide strength parameters is presented. The comparison and analysis of the inversion results of Vermilion Bird cave landslide engineering in western Hunan show that, based on two-dimensional and three-dimensional slope limit analysis method, The inversion results of slope slip surface strength parameters obtained by probabilistic reliability theory method and traditional transfer coefficient method are in good agreement with the field survey results. The validity of the new inversion method of landslide strength parameters proposed in this paper is verified. The inverse strength parameters of the upper limit method of 3D limit analysis are smaller than that of the two dimensional limit analysis method, which reflects the lateral constraint of landslide body, and the inversion result can reflect the real situation of landslide.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU43;P642.22

【参考文献】