基于变形数据的边坡稳定性评判方法研究

发布时间：2018-11-18 15:42

【摘要】：国民经济的不断增长刺激着交通运输的迅速发展,也为基础建设提供了良好的契机,在众多工程地质灾害中,边坡的失稳破坏占据着相当大的比例,严重威胁着人民的生命财产安全。目前,有效的边坡稳定性评价标准都是建立在极限平衡法的基础之上,为了对边坡的稳定状态做出准确的评判,需要对边坡的安全系数做精确的计算,结论虽然可靠,但操作较为复杂,而且边坡的破坏往往具有瞬时性,这就要求对边坡稳定性的判断不仅要准确还要及时。基于此,本文的目的就在于寻找一种快速的评价方法能对边坡的稳定状态做出准确的评判。研究发现,影响边坡稳定性的因素很多,而且现实中的边坡由于其特定的环境及其性质都存在很大的差别,因此,要想建立一套完善的具有普适性的评价标准是十分困难的,但同时边坡又可按照一定的原则进行分类,同一类型的边坡在一定范围内具有相同的性质。边坡发生破坏的过程,实际上是边坡变形积累的过程,当变形达到一定程度后,边坡就会发生失稳破坏,变形和破坏之间的内在联系就为边坡的稳定性评价提供了一个新的方向。本文选择了简单的均质土边坡作为研究对象,在总结分析边坡破坏特点及模式的基础上,根据要研究的对象完成了建模工作,用强度折减法原理,分析了在不同坡高及坡比条件下边坡的最大位移以及相应的安全系数,并得到了边坡的塑性区云图,其次,研究边坡的动态监测,针对边坡变形产生滑移面以及最大位移,设置动态监测点用来实时监测边坡的变形情况,为分析边坡稳定性标准提供准确的位置。最后,本文采用了突变理论里面的尖点突变模型对边坡变形数据和稳定性系数之间的关系做了分析研究。本文的重点在于分析和建立边坡变形数据和稳定性之间的联系,采用ansys有限元软件分析不同坡高、坡比条件下边坡的变形破坏特征,然后对所得到的变形数据做出总体分析研究,寻找能评判边坡稳定性的指标。本文取得的研究成果有利于进一步完善边坡稳定性评判方法,并对类似的工程提供一定的参考。
[Abstract]:The continuous growth of the national economy stimulates the rapid development of transportation and provides a good opportunity for infrastructure construction. In many engineering geological disasters, the slope failure occupies a large proportion. It is a serious threat to the safety of people's lives and property. At present, the effective evaluation criteria of slope stability are all based on the limit equilibrium method. In order to make an accurate evaluation of the slope stability, it is necessary to make an accurate calculation of the slope safety factor, although the conclusion is reliable, However, the operation is more complicated, and the slope failure is always instantaneous, which requires not only accurate but also timely determination of slope stability. Based on this, the purpose of this paper is to find a rapid evaluation method to evaluate the stability of slope accurately. It is found that there are many factors that affect slope stability, and the actual slope has great differences because of its specific environment and properties. Therefore, it is very difficult to establish a set of perfect universal evaluation criteria. But at the same time, the slope can be classified according to certain principles, the same type of slope has the same property in a certain range. The process of slope failure is actually the process of slope deformation accumulation. When the deformation reaches a certain degree, the slope will lose its stability. The relationship between deformation and failure provides a new direction for slope stability evaluation. In this paper, a simple homogeneous soil slope is chosen as the research object. On the basis of summing up and analyzing the characteristics and modes of slope failure, the modeling work is completed according to the object to be studied, and the principle of strength reduction is used. The maximum displacement and the corresponding safety factor of the slope under different slope height and slope ratio are analyzed, and the cloud map of the plastic zone of the slope is obtained. Secondly, the dynamic monitoring of the slope is studied, and the slip surface and the maximum displacement are obtained according to the deformation of the slope. The dynamic monitoring points are used to monitor the deformation of the slope in real time, which provides an accurate position for the analysis of slope stability standards. Finally, the relationship between slope deformation data and stability coefficient is analyzed by using the cusp catastrophe model in catastrophe theory. The emphasis of this paper is to analyze and establish the relationship between slope deformation data and stability. The deformation and failure characteristics of slope under different slope height and slope ratio are analyzed by ansys finite element software. Then the deformation data are analyzed and studied to find the index to evaluate the slope stability. The research results obtained in this paper are helpful to further improve the evaluation method of slope stability and provide some reference for similar projects.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14

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