黄土边坡滑裂面搜索技术与加固优化研究

发布时间：2018-07-20 18:00

【摘要】：中国是一个滑坡灾害极为频繁的国家,尤其是我国黄土地区,滑坡更是以规模大、机制复杂、危害大等特点著称于世。所以滑裂面的确定与滑坡治理已经成为当前亟需解决的重要课题。但现有滑裂面搜索方法既难以保证所确定的临界滑面的准确性,又容易在计算过程中陷入局部最小值陷阱,而且搜索范围广、工作量大。为了解决上述难题,本文以陕北某卸油台高边坡工程为背景,基于坐标轮换法与变度量法,提出了交替变度量法,并与有限元强度折减法结合,探讨一种边坡最小安全系数及任意形状临界滑动面的搜索技术。另外,本文还对该边坡的加固措施进行了优化研究。本文主要研究内容如下:(1)详细阐述强度折减法现存问题,对边坡失稳判别标准进行探讨;通过理论和实例分析研究弹性模量E与泊松比μ的调整对有限元强度折减法分析结果的影响。(2)本文应用MATLAB软件编制交替变度量法应用程序,并与有限元强度折减法结合搜索陕北某卸油台边坡临界滑动面,通过与现场实测数据进行对比,论证其可行性及实用性。(3)由于陕北某卸油台滑坡工程地质复杂,为了有效的模拟抗滑桩的工作机理,本文采用ABAQUS软件建立三维模型进行数值模拟。针对抗滑桩设计方面存在的问题,从排距、桩间距、桩身截面尺寸等方面展开研究工作,为今后复杂黄土边坡中的抗滑桩加固设计提供参考。
[Abstract]:China is a country with frequent landslide disasters, especially in loess area of China. Landslide is famous for its large scale, complex mechanism and great harm. Therefore, the determination of sliding surface and landslide treatment has become an important issue that needs to be solved. However, it is difficult to guarantee the accuracy of the critical sliding surface and fall into the local minimum trap in the course of calculation. Moreover, the scope of search is wide and the workload is large. In order to solve the above problems, based on the coordinate rotation method and variable metric method, the alternating variable metric method is put forward in this paper, which is combined with the finite element strength reduction method, and based on the background of the high slope engineering of a certain oil unloading platform in Northern Shaanxi. A search technique for the minimum safety factor of slope and the critical sliding surface with arbitrary shape is discussed. In addition, this paper also carries on the optimization research to the slope reinforcement measure. The main contents of this paper are as follows: (1) the existing problems of strength reduction method are described in detail, and the criteria for judging slope instability are discussed. The influence of the adjustment of elastic modulus E and Poisson's ratio 渭 on the results of the finite element strength reduction method is studied through theoretical and practical analysis. (2) the application program of alternating variable measure method is compiled by MATLAB software in this paper. And combined with the finite element strength reduction method to search the critical sliding surface of a unloading platform slope in Northern Shaanxi, the feasibility and practicability of the landslide are proved by comparing with the field measured data. (3) the engineering geology of a unloading platform landslide in Northern Shaanxi is complicated. In order to simulate the working mechanism of anti-slide pile effectively, Abaqus software is used to establish three-dimensional model for numerical simulation. Aiming at the problems existing in the design of anti-slide pile, the research work is carried out from the aspects of row spacing, pile spacing and pile cross-section size, which provides a reference for the reinforcement design of anti-slide pile in the complex loess slope in the future.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU444;P642.22

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