现浇泡沫轻质土在广明高速公路罗格收费广场应用效果研究

发布时间：2018-07-07 07:14

本文选题：泡沫轻质土 + 大面积堆载　；参考：《广州大学》2017年硕士论文

【摘要】：作为一种新型的轻质填料,泡沫轻质土具有轻质、强度可调节、垂直浇筑、整体均质及环保等特点,使施加在地基上的荷载减少,解决软基路段容易产生较大工后沉降的问题。目前,泡沫轻质土工法已成功广泛的应用在多个领域,并且在解决世界级难题-桥头跳车等方面具有其特有的优势。本课题是利用泡沫轻质土的特性,将其引入来处理大面积堆载条件下的软基,通过设计计算、数值模拟及现场监测三个方面来说明这种工法用来处理大面积堆载下软基的效果,能够显著的减少大面积堆载荷载的重量,减少地基附加应力,达到控制工后沉降的目的。本课题依托广明高速罗格收费广场工程,主要研究内容及其得到的结论如下:(1)分析常用的处理大面积堆载工况下的软土地基处理方法的优缺点,根据本工程的地质概况,通过从技术、经济、工期等方面的综合比较,选取采用现浇泡沫轻质土工法来处理本工程的软基;(2)对这种新型的轻质路堤-泡沫轻质土轻质路堤法进行了详细介绍,介绍了这种新型材料的基本性能和研究应用现状,同时对泡沫轻质土路基的设计原理进行了介绍;(3)运用设计软件理正岩土软件对现浇泡沫轻质土处理大面积堆载条件下软基的累计沉降和工后沉降进行了计算,得出的沉降结果符合规范要求;(4)通过有限元软件MIDAS/GTS对广明高速罗格收费广场的软基处理工程进行了数值模拟,研究泡沫轻质土在处理大面积堆载条件下软基的应力应变规律,同时,对路基填筑普通填土及袋装砂井堆载预压法来处理本工程的软基进行了数值模拟,并将三种方法得到的沉降结果进行了对比,进一步验证了泡沫轻质土处理大面积堆载下软基的可行性,证明泡沫轻质土法是处理本工程软基的最佳方法之一;(5)对依托工程路基施工过程中及通车2年的变形进行监测,整理分析现场监测数据,研究泡沫轻质土路堤荷载作用下软土地基的各种性状(包括沉降、水平位移、路面弯沉等),得出运用这种新型填料处理软基的效果;并将设计计算、数值模拟及现场监测得到的沉降值进行了对比分析,得出实际监测效果更好,再次证明泡沫轻质土工法是大面积堆载工况下软基处理方法之中的最优方案之一。
[Abstract]:As a new type of lightweight filler, the foam lightweight soil has the characteristics of light weight, adjustable strength, vertical pouring, overall homogeneity and environmental protection, which reduces the load applied on the foundation and solves the problem of large post-construction settlement in the soft foundation section. At present, the foam lightweight geotechnical method has been successfully applied in many fields, and has its unique advantages in solving the world-class problem, such as bridge-head jumping. This subject is to use the characteristics of foam lightweight soil to deal with soft foundation under the condition of large area surcharge. Through design calculation, numerical simulation and field monitoring, the paper illustrates the effect of this method used to deal with soft foundation under large area surcharge. It can significantly reduce the weight of large area load, reduce the additional stress of foundation, and achieve the purpose of controlling the settlement after construction. Based on the Guangming high speed Rogge toll plaza project, the main research contents and conclusions are as follows: (1) analyzing the advantages and disadvantages of the commonly used soft soil foundation treatment methods under the condition of large area load, according to the geological survey of this project, Through the comprehensive comparison of technology, economy, construction period and so on, the soft foundation of the project is treated with cast-in-place foam light earth method. (2) the new light embankment, foam light soil lightweight embankment method is introduced in detail. The basic properties and research and application status of this new material are introduced. At the same time, the design principle of foamed lightweight soil subgrade is introduced. (3) the cumulative settlement and post-construction settlement of soft foundation under the condition of large area surcharge treatment of cast-in-place foam lightweight soil are calculated by using the design software Light-rock soil software. The settlement results obtained meet the requirements of the code. (4) through the finite element software Midas / GTS, the soft foundation treatment project of Guangming High-speed Rogge Toll Plaza is simulated, and the stress-strain law of soft foundation is studied under the condition of large area surcharge treatment of foamed lightweight soil. At the same time, numerical simulation is carried out to treat the soft foundation of the project by filling the subgrade with ordinary fill and sand-hole loading preloading method, and the settlement results obtained by the three methods are compared. The feasibility of treating soft foundation under large area surcharge by foam lightweight soil is further verified, and it is proved that the foam light soil method is one of the best methods to deal with soft foundation of this project. (5) Monitoring the deformation during subgrade construction and open to traffic for 2 years, The field monitoring data are analyzed, and the characteristics of soft soil foundation (including settlement, horizontal displacement, pavement deflection, etc.) under the load of foam lightweight soil embankment are studied, and the effect of using this new packing to treat soft foundation is obtained, and the design calculation is carried out. The results of numerical simulation and field monitoring show that the actual monitoring effect is better. It is proved again that the foam lightweight geotechnical method is one of the best methods for soft foundation treatment under the condition of large area heaped load.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414;U417.7

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