边坡形态与岩层产状对反倾向边坡稳定性影响的数值分析

发布时间：2018-01-03 09:36

本文关键词：边坡形态与岩层产状对反倾向边坡稳定性影响的数值分析　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：反倾向岩质边坡是指边坡的走向与岩层的走向近于平行、倾向相反的边坡。反倾向岩质边坡的结构形态决定其相对稳定,与顺倾向边坡相比,有关其稳定性的研究相对较少。随着山区公路工程建设项目的增多,反倾向岩质边坡的变形失稳导致的工程病害甚至灾难性事件亦屡见不鲜。因此,本文针对边坡形态及岩层产状对边坡稳定问题开展研究是有实际工程意义的。论文首先论述了影响反倾向岩质边坡稳定性的自然要素,着重论证了边坡形态与岩层产状对其稳定性的影响。其次,依据单因子变量原理,制定出岩层倾角、边坡坡度、坡高对反倾向岩质边坡稳定性影响的分析方案。采用有限元数值分析法,以基于强度折减理论的Phase2有限元分析软件为计算平台,对多个数值模型进行计算;最后,通过对数值模拟计算成果中的强度储备安全系数、最大剪应变、水平位移等图的分析,总结出其强度储备安全系数随岩层倾角、边坡坡度、边坡高度等要素的变化规律如下:(1)岩层倾角与强度储备安全系数近似为4次函数曲线关系,曲线可分为4个阶段:强度储备安全系数平缓段、下降段、最低段、上升段。(2)强度储备安全系数随边坡坡度的增大而降低,二者呈线性负向相关。(3)强度储备安全系数随坡高的增加而降低,坡高50m,坡高变化对强度储备安全系数影响显著,坡高50m,坡高变化对强度储备安全系数影响较小。(4)综合分析岩层倾角、边坡坡度、坡高的变化对强度储备安全系数敏感性的影响:岩层倾角在(0°,25°)(65°,85°),坡高的变化对强度储备安全系数影响较大,其次分别为坡度、岩层倾角;岩层倾角(35°,55°),坡度的变化对强度储备安全系数影响较大,其次分别为坡高、岩层倾角。
[Abstract]:ANTIDIP slope refers to the slope direction of rock and the nearly parallel, toward the opposite slope. Morphology of ANTIDIP rock slope is determined by its relatively stable, compared with the consequent slope, research on its stability is relatively small. With the increase of mountain highway construction project, the anti deformation tendency of rock slope the loss of stability of Engineering diseases and even lead to catastrophic events also It is often seen.. Therefore, according to the shape of the slope and rock occurrence on the slope stability research is of practical engineering significance. The paper first discusses the influence of anti-dumping to the natural elements of rock slope stability, focuses on the effect of slope shape and terrane of its stability. Secondly, on the basis of the single factor variable principle, formulate the dip angle, slope gradient, slope height on inclined rock slope stability analysis of the influence of the finite program. Numerical analysis method, with strength reduction finite element analysis software Phase2 theory for computing platform based on a numerical model is calculated; finally, based on the numerical simulation of strength safety coefficient results in the maximum shear strain analysis, horizontal displacement diagram, summed up the strength reserve safety coefficient of rock angle, slope gradient, slope height variation and other factors are as follows: (1) the dip angle and strength reserve safety coefficient is approximately 4 times function curve, the curve can be divided into 4 stages: the safety coefficient of strength reserve gently, descending, the lowest segment, ascending segment. (2) and the strength reserve safety coefficient decreased with the increasing of slope, a linear negative correlation between the two. (3) with high strength reserve safety coefficient of slope decreases with the increase of the height of the slope, 50m, influence of slope height change on the strength reserve safety coefficient significantly, high slope 50m, slope height change on strong The degree of reserve smaller safety factor. (4) a comprehensive analysis of the dip angle, slope gradient, slope height influence on the strength reserve safety coefficient sensitivity: in the dip angle (0 degrees, 25 degrees (65 degrees), 85 degrees), change of slope height has great influence on the strength reserve safety coefficient, respectively slope obliquity; dip angle (35 degrees, 55 degrees), the change in slope has great influence on the strength reserve safety coefficient, followed by slope high dip angle.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.14

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