山区高填方地基强夯试验及加筋土挡墙工作性能研究

发布时间：2018-06-16 17:24

本文选题：强夯法 + 加筋土挡墙　；参考：《浙江大学》2013年硕士论文

【摘要】：近年来,随着工程建设规模的不断扩大,越来越多的工程(如电厂、变电站、石化和机场等工程)选址在山地或丘陵地带,以保护环境和节约用地。这些工程的地基大部分为高填方地基,将要面临着大量的土方回填工作。由于强夯法具有经济高效、施工简单、地基处理效果明显等优点,因而常被用来处理高填方地基,从而提高地基土的强度和承载力,降低地基土的压缩性,改善回填地基的不均匀性。高边坡或加筋土挡墙往往会伴随高填方地基的产生而产生,因而研究加筋土挡墙的工作性能及强夯振动对加筋土挡墙的影响具有重大的现实意义和工程价值。本文以某特高压变电站新建工程高填方地基为依托,对强夯加固高填方地基中的一些具体问题进行了分析,研究了强夯振动的衰减规律及强夯振动对加筋土挡墙的影响,提出了防治强夯振动的具体措施,主要内容有： 1.介绍了常用的高填方地基处理方法,提出了强夯法的优越性。阐述了强夯(置换)加固地基原理和加筋土挡墙原理。 2.分别开展强夯置换试验和回填土强夯试验,根据地基加固结果对强夯(置换)施工参数和施工工艺进行优化选择。 3.分析了山区高填方强夯地基常用的几种检测手段的基本原理和优缺点,在此基础上,探讨了综合采用多种检测手段在大面积山区回填碎石土强夯地基中检测的可能性,并根据大量的检测试验结果,运用统计学原理分析了地基承载力特征值、变形模量、剪切波速和动力触探击数之间的相关性。 4.根据现场强夯振动试验和有限元模拟结果,分析了强夯振动的衰减规律及其强夯对加筋土挡墙位移场的影响,提出了强夯施工的安全距离和防治强夯振动的措施。 5.根据现场加筋土挡墙土工格栅内力监测和有限元分析结果,分析了土工格栅内力的变化规律,提出了加筋土挡墙潜在破坏面的发展趋势。
[Abstract]:In recent years, with the continuous expansion of engineering construction, more and more projects (such as power plants, substations, petrochemical and airport projects) are located in mountainous or hilly areas to protect the environment and save land. The foundation of these projects is mostly high-fill foundation, and will face a lot of earthwork backfill. Because the dynamic compaction method has the advantages of economy and efficiency, simple construction and obvious effect of foundation treatment, it is often used to treat high fill foundation, thus increasing the strength and bearing capacity of foundation soil and reducing the compressibility of foundation soil. Improve the inhomogeneity of backfill foundation. High slope or reinforced earth retaining wall often comes into being with high fill foundation, so it is of great practical significance and engineering value to study the working performance of reinforced earth retaining wall and the influence of dynamic compaction vibration on reinforced earth retaining wall. Based on the high fill foundation of a new project of an UHV substation, this paper analyzes some concrete problems in the reinforcement of high fill foundation by dynamic compaction, and studies the attenuation law of dynamic compaction vibration and the influence of dynamic compaction vibration on reinforced earth retaining wall. The concrete measures to prevent vibration of dynamic compaction are put forward. The main contents are as follows: 1. This paper introduces the common treatment methods of high fill foundation, and puts forward the superiority of dynamic compaction method. This paper expounds the principle of dynamic compaction (replacement) strengthening foundation and reinforced earth retaining wall. 2. Dynamic tamping replacement test and backfill dynamic compaction test were carried out respectively. According to the results of foundation reinforcement, the construction parameters and construction technology of dynamic compaction (replacement) were optimized. 3. This paper analyzes on the basic principle, advantages and disadvantages of several testing methods commonly used in high fill dynamic compaction foundation in mountainous area. On the basis of this, the possibility of detecting the dynamic compaction foundation of backfilled gravel soil in a large area of mountainous area by comprehensive use of many kinds of testing methods is discussed. Based on a large number of test results, the correlation between the characteristic values of bearing capacity, modulus of deformation, shear wave velocity and the number of dynamic penetration is analyzed by using the statistical principle. 4. Based on field dynamic compaction vibration test and finite element simulation results, the attenuation law of dynamic compaction vibration and the influence of dynamic compaction on displacement field of reinforced earth retaining wall are analyzed. The safe distance of dynamic compaction construction and measures to prevent and cure dynamic compaction vibration are put forward. 5. Based on the results of field monitoring and finite element analysis of geogrid internal force of reinforced earth retaining wall, the variation law of geogrid internal force is analyzed, and the development trend of potential failure surface of reinforced earth retaining wall is put forward.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU472.31

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