软弱土地区路堤加固新型结构试验研究

发布时间：2018-03-17 13:55

本文选题：软弱土　切入点：新型加固结构　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：伴随着现如今国内经济的迅速腾飞,各个行业也得到了飞速发展。在软弱土地基处理的问题上,随着新型材料的出现以及更加先进的施工机械的运用等原因,致使曾今认为不可实现的处理技术焕发出新的荣光。从而也使得软弱土地基的处理技术也逐渐趋于成熟与完善。然而,传统的加固软弱土地基的工法,在加固方面往往存在工期长、造价高、施工难度大、工后易变形等各自不同的问题以及自身对不同软弱土处理的局限性。就此,本文提出一种力学上为闭合结构的加固新型结构体系。此体系为对拉柔性拉筋结构和复合式桩板墙结构共同构成,能够有效的起到提高承载力、维持路堤稳定性的作用。为研究该结构体系的受力特征及其可行性,本文主要做了以下的工作内容。(1)回顾了软弱土地基加固技术的发展与应用,并简要叙述了软弱土地区的路堤修筑,包括软基加固原理的综述、软基的固结理论和路堤病害研究。通过对现有工法的深层次的了解与研究,提出了加固新型结构体系,用以解决各个软基加固工法中存在的自身局限性和缺陷。(2)依托于结构力学等力学知识,结合加固新型结构的受力状况,以及运用MATLAB编程,推导出加固新型结构的位移变化方程和内力求解方程。同时,结合工程实例,对含有单层对拉结构的加固结构进行了分析,从结果可以看出,新型结构对结构的竖向和侧向位移都起到了良好的控制。特别是侧向位移的控制,使其最大位移只有0.02cm。(3)利用相似原理,进行了室内模型试验。通过试验所得数据分析,给出了结构的内侧所受土压力的分布规律以及其内力的分布趋势,得出了结构内侧的土压力符合经典库伦土压力理论。而后,运用试验与理论计算的相互印证,可以看出理论计算的内力变化趋势和试验所得的相似性。并利用理论分析,对比了无对拉筋带结构和有拉筋带结构对路堤的控制性,可以发现无对拉筋带的结构体系几乎没有起到对路堤稳定性的控制,侧面的验证了整体结构对路堤稳定性拥有的良好控制作用。
[Abstract]:With the rapid development of the domestic economy nowadays, various industries have also developed rapidly. On the issue of soft soil foundation treatment, with the emergence of new materials and the use of more advanced construction machinery, and so on, Thus, the treatment technology of soft soil foundation gradually matured and perfected. However, the traditional method of strengthening soft soil foundation, In the aspect of reinforcement, there are many different problems, such as long construction period, high cost, difficult construction, easy deformation after construction, etc., and their own limitations to the treatment of different soft soil. In this paper, a new type of structural system is proposed, which is composed of tensile flexible tensile reinforcement structure and composite pile-plate wall structure, which can effectively improve the bearing capacity. The function of maintaining the stability of embankment. In order to study the mechanical characteristics and feasibility of the structure system, this paper mainly does the following work. 1) reviewing the development and application of soft soil foundation strengthening technology. The paper briefly describes the construction of embankment in soft soil area, including the summarization of the reinforcement principle of soft foundation, the consolidation theory of soft foundation and the study of embankment disease. Through the deep understanding and research on the existing construction methods, the paper puts forward a new structural system for strengthening the soft foundation. It is used to solve the limitation and defect existing in each soft foundation reinforcement method. It is based on mechanics knowledge such as structural mechanics, combined with the mechanical condition of strengthening new structure, and using MATLAB programming, The displacement variation equation and the internal solution equation of the new reinforced structure are derived. At the same time, combined with the engineering example, the strengthened structure with single-layer tensile structure is analyzed, and the results can be seen. The new structure has played a good role in controlling the vertical and lateral displacements of the structures, especially in the control of lateral displacements, the maximum displacement of which is only 0.02cm.m3) the indoor model tests have been carried out by using the principle of similarity, and the data obtained from the tests have been analyzed. The distribution law of the earth pressure on the inner side of the structure and the distribution trend of its internal force are given. It is concluded that the earth pressure inside the structure accords with the classical Coulomb earth pressure theory. It can be seen that the variation trend of internal force calculated in theory and the similarity of test results, and by using theoretical analysis, the control of the no-pair strapping structure and the strapping structure on the embankment is compared. It can be found that the stability of embankment can hardly be controlled by the structure system with no pulling band, and the overall structure has good control effect on the stability of embankment.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.12

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