土质边坡抗滑桩支护稳定性分析及参数优化

发布时间：2018-01-10 15:00

本文关键词：土质边坡抗滑桩支护稳定性分析及参数优化　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：边坡是广泛分布于地表的一种地貌形态,是普遍存在于各种工程活动中的地质地貌环境之一。但是由于边坡工程是一个十分复杂的综合性的岩土工程难题,如何能够保证边坡工程的稳定性、经济性和实用性仍然是当前现代化城市建设进程中一个非常重要的问题。抗滑桩因为具有适用范围广、抗滑效果好、对周围地质环境影响小等诸多突出的优点,成为治理滑坡等地质灾害中最主要的一种方法。边坡工程的稳定性受到边坡自身的结构特性、地形地貌、土体性质、地质构造及抗滑桩的支护参数等情况的综合影响,然而目前对每种因素的影响机理及权重的分析还不是很完善,还需要进一步研究和探索。从边坡抗滑桩支护的机理出发,利用Midas/GTS有限元数值模拟软件,以安全系数和抗滑桩的水平位移为边坡稳定性的主要评价指标,使用单因素变量法对土体强度参数、坡角、地下水位和桩的位置四个因素对边坡抗滑桩支护的稳定性影响进行研究和分析,结果发现边坡的稳定性与土体粘聚力、内摩擦角、地下水位和坡角显著相关,但是弹性模量和泊松比对边坡稳定性影响不大;当抗滑桩的位置在边坡中部时,边坡的稳定性最好。以具体的人工边坡加固工程为例,利用Midas/GTS数值模拟软件,先用单因素变量法分析抗滑桩的桩长、桩间距和桩径对边坡稳定性的影响。然后利用正交试验设计的方法,在地层条件和抗滑桩的物理力学参数都一样的前提下,选取桩长、桩间距和桩径这三个因素,以边坡的安全系数和抗滑桩的桩顶最大水平位移为评价指标,利用极差分析,发现桩间距对边坡安全系数和桩顶水平位移的影响都是最大的,其次是桩径,桩长的影响最小。根据以上分析,运用Matlab数学软件将桩长、桩间距和桩径三个因素对边坡的综合影响进行线性回归分析,得到相关的经验公式,由此得出边坡稳定性与这三个因素呈多元线性回归,并表现为显著相关。最后细化桩间距取值,以间距为单一变量,并结合其它因素的影响对该工程抗滑桩支护进行优化设计,并运用Matlab数学软件拟合出安全系数与桩间距的关系曲线,得到相关的经验公式,为今后解决类似边坡工程的稳定性问题提供参考。
[Abstract]:Slope is a kind of geomorphologic form widely distributed on the surface, which is one of the geological and geomorphological environments in various engineering activities. However, slope engineering is a very complex and comprehensive geotechnical engineering problem. How to ensure the stability of slope engineering, economy and practicality is still a very important problem in the process of modern urban construction. Anti-slide pile has a wide range of application, good anti-slide effect. Many outstanding advantages, such as small influence on the surrounding geological environment, have become the most important method in the treatment of landslide and other geological disasters. The stability of slope engineering is affected by the structural characteristics of the slope itself, topography and geomorphology, and soil properties. The comprehensive influence of geological structure and supporting parameters of anti-slide pile, however, the analysis of the influence mechanism and weight of each factor is not perfect. According to the mechanism of slope anti-slide pile support, Midas/GTS finite element numerical simulation software is used. Taking the safety factor and horizontal displacement of anti-slide pile as the main evaluation index of slope stability, the single factor variable method is used to evaluate the soil strength parameters and slope angle. The influence of groundwater level and pile position on the stability of slope anti-slide pile support is studied and analyzed. The results show that the stability of slope is significantly related to the cohesion of soil, the angle of internal friction, the groundwater level and the angle of slope. However, elastic modulus and Poisson ratio have little effect on slope stability. When the anti-slide pile is located in the middle of the slope, the stability of the slope is the best. Taking the concrete artificial slope reinforcement project as an example, the numerical simulation software Midas/GTS is used. The single factor variable method is used to analyze the influence of pile length, pile spacing and pile diameter on slope stability, and then the orthogonal design method is used. On the premise of the same physical and mechanical parameters of the anti-slide pile, the safety factor of slope and the maximum horizontal displacement of the pile top are taken as the evaluation index, and the pile length, the pile spacing and the pile diameter are selected as the three factors. By means of range analysis, it is found that the influence of pile spacing on slope safety factor and pile top horizontal displacement is the largest, followed by pile diameter and pile length. The comprehensive influence of pile length, pile spacing and pile diameter on slope is analyzed by Matlab software, and relevant empirical formulas are obtained. It is concluded that the slope stability is multiple linear regression with these three factors, and the correlation is significant. Finally, the value of pile spacing is refined, and the spacing is taken as a single variable. Combined with other factors to optimize the design of anti-slide pile support, and use Matlab mathematical software to fit the relationship curve between safety factor and pile spacing, and get the relevant empirical formula. It provides a reference for solving the stability problem of similar slope engineering in the future.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753.8;TU43

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