陇南成州机场地基处理试验研究

发布时间：2018-04-20 01:15

本文选题：机场工程 + 高填方　；参考：《兰州理工大学》2015年硕士论文

【摘要】：随着国家经济建设的飞速发展和西部大开发战略的广泛实施,越来越多的大规模投资建设项目在西北地区得到了长足发展,其中最为典型的便是航空运输产业。但是不同于中东部地区,机场建设场区多在山区地带,多面临高填方,高边坡,地质条件复杂及气候环境异常等一系列工程地质问题,因此高填方地基处理及稳定性研究成为了西北地区机场建设所要解决的首要问题。本文以陇南成州机场建设项目为背景,论述了国内外高填方项目工程的研究现状及施工技术的进展,根据对该场区特殊地质情况的勘查与调研,设立相应合理与正确的地基处理试验,通过试验,得出地基处理及填筑碾压的适用技术,最后对高填方地基处理试验进行分析且就其稳定性开展数值模拟计算与研究。具体试验与研究工作如下:(1)在广泛查阅和归纳总结国内外相关文献的基础上,通过对强夯法加固机理的深入探究,设计现场强夯试验。调查资料显示,强夯法作为地基处理方法是非常高效且可行的,该场区地基处理应首先选择强夯法。(2)通过对现场填筑碾压试验设计与结果分析可知:振动碾压及振动碾压结合强夯法的土方填筑方法可操作性强且处理效果良好,并且无论上述哪种工艺,填土含水量都是影响压实效果的主要因素,施工过程中必须处理好此问题。通过试验结果与处理效果相比对,给出适用于本机场场区合理的压实建议。(3)利用Midas/GTS大型有限元软件对强夯全过程进行数值模拟研究与计算,总结了不同夯击次数下地表沉降量及作用应力的变化规律,并与现场强夯试验结果进行比对,判断模拟结果的准确性。说明采用强夯法对地基加固处理是可行的。
[Abstract]:With the rapid development of national economic construction and the extensive implementation of the western development strategy, more and more large-scale investment and construction projects have been developed in Northwest China, among which the air transport industry is the most typical. However, unlike in the central and eastern regions, the airport construction sites are mostly located in mountainous areas and face a series of engineering geological problems, such as high fill, high slope, complex geological conditions and abnormal climate and environment. Therefore, the study of high-fill foundation treatment and stability has become the most important problem for airport construction in Northwest China. Based on the construction project of Chengzhou Airport in Longnan, this paper discusses the research status and the progress of construction technology of high fill project at home and abroad. Set up the corresponding reasonable and correct foundation treatment test, through the test, obtain the suitable technology of foundation treatment and filling roller compaction, finally carry on the analysis to the high fill foundation treatment test and carry on the numerical simulation calculation and research on its stability. The concrete test and research work are as follows: (1) on the basis of extensively consulting and summing up the relevant literature at home and abroad, the field dynamic compaction test is designed through the deep exploration of the reinforcement mechanism of the dynamic compaction method. The investigation data show that the dynamic compaction method is very efficient and feasible as a foundation treatment method. Firstly, the dynamic compaction method should be selected for ground treatment in the field. (2) through the design and analysis of the field filling roller compaction test, it can be seen that the earth filling method of vibration compaction and vibratory compaction combined with dynamic compaction method is feasible and has good treatment effect. No matter which process mentioned above, the water content of fill is the main factor that affects the compaction effect, and this problem must be dealt with well in the construction process. By comparing the experimental results with the treatment results, a reasonable compaction suggestion for the airport field area is given. The numerical simulation and calculation of the whole process of dynamic compaction are carried out by using Midas/GTS software. The variation law of surface subsidence and action stress under different times of compaction is summarized and compared with the results of field dynamic compaction test to judge the accuracy of simulation results. It shows that it is feasible to reinforce the foundation by using dynamic compaction method.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU41

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