土壤固化剂用于公路沙土地基的研究

发布时间：2018-06-14 07:50

本文选题：土壤固化剂 + 稳定砂土　；参考：《南昌大学》2015年硕士论文

【摘要】：现在的公路的路基大部分是使用各种大小的石材摊铺而成,经过碾压达到强度,这个施工过程需要大量的运输各种石材,人工和机械消耗巨大,成本也较高,我们在本文中考虑使用土壤固化剂来进行沙土或土壤的固化,以便代替原有的碎石地基。土壤固化剂是一种由多种无机、有机合成的材料,它是一种新型土工复合材料,被用于加固土壤。在改变土壤原来的松散,受力易变性等物理性能、力学性质上它具有优良的性能。土壤固化剂是把原有施工区域的土壤与固化剂通过机械搅拌均匀混合。混合后通过土壤固化剂和土体发生的一系列溶解电离,从而改变土壤的含水率,孔隙率,降低胶结的土壤颗粒等。同时也能够改善土壤的刚度和强度,使得土体变为致密的、性能优良的胶凝材料。与此同时,土壤若采用土壤固化剂固化之后,也会具有水稳定性、抗裂性能等一系列的路用性能。在公路地基工程施工过程中,我们拟采用大量采用土壤固化剂固化土来代替原有的碎石压实地基,那么必然会有工程造价较低、施工工艺简单、性能优良、施工方便、施工工期短、使用范围广等一系列的优点,同时如果大面积推广可以降低碎石的使用,从而可以减少工程中的运输费用达到环保、经济效益都佳的效果。本文以成南高速公路工程项目为依托,深入探讨土壤固化剂稳定砂土的施工工艺及路用性能,以便为日后全面推广应用土壤固化剂奠定一定的基础,应用价值较为突出。本文第一部分是提出问题,主要是简单阐述研究目的及意义,以及国内外专家学者的研究成果及文献综述。第二部分是强度形成机理进行了分析,首先,阐述了机械压实作用,其次,分析了化学反应过程。第三部分是各种配合比的实验,主要是对土壤固化剂稳定砂土的配合比试验进行研究,首先,分析了原材料工程性质,提出了各种配合比。其次,根据配合比试配,对混合物进行了击实试验和7天无侧限抗压强度试验。对各个配合比的性能进行了对比。第四部分是深度分析,以成南高速公路工程为例,深入探讨了土壤固化剂在公路地基上应用的可行性、设计了试验方案;其次,分别开展了力学性能试验、水稳性能试验、干缩特性试验等实验。试验结果表明：土壤固化剂使用在公路地基能够满足设计的强度和刚度要求,完全满足施工建设需要。第五部分是现场施工,通过200米的实验道路,现场用第三章得到的最佳配合比进行混合物的调配,代替原设计的碎石地基。并对成品进行实验。第六部分为结论与展望部分。
[Abstract]:The roadbed of today's highways is mostly paved with stone materials of various sizes. After compacting to the strength, the construction process requires a great deal of transportation of various kinds of stone materials. The labor and machinery consumption is huge and the cost is high. In this paper, we consider the use of soil curing agent to solidify sand or soil to replace the original gravel foundation. Soil curing agent is a kind of inorganic, organic material. It is a new type of soil composite material, which is used to reinforce soil. It has excellent mechanical properties in changing the physical properties of soil such as looseness, mechanical variability and so on. Soil curing agent is to mix the soil and curing agent in the original construction area by mechanical mixing. After mixing with soil curing agent and a series of dissolving and ionization of soil, the soil moisture content, porosity and cemented soil particles are changed. At the same time, it can improve the stiffness and strength of soil, and make the soil become compact and excellent cementing material. At the same time, if the soil curing agent is used, the soil will have a series of road properties, such as water stability, crack resistance and so on. In the course of highway foundation engineering construction, we plan to use a large number of soil solidification agent to replace the original crushed stone compacted foundation, so there must be a low construction cost, simple construction technology, excellent performance and convenient construction. There are a series of advantages such as short construction period and wide range of use. At the same time, if the use of crushed stone can be reduced in a large area, the transportation cost in the project can be reduced to environmental protection, and the economic benefit is good. Based on the project of Chengnan Expressway, this paper probes deeply into the construction technology and road performance of soil curing agent stabilized sand soil, so as to lay a certain foundation for popularizing and applying soil curing agent in the future, and the application value is more outstanding. The first part of this paper is to put forward questions, mainly to briefly explain the purpose and significance of the research, as well as the domestic and foreign experts and scholars' research results and literature review. In the second part, the mechanism of strength formation is analyzed. Firstly, the mechanical compaction and the chemical reaction process are described. The third part is about the experiment of mixing ratio, which mainly studies the mixture ratio of stabilized sandy soil with soil curing agent. Firstly, the engineering properties of raw materials are analyzed, and various mix ratios are put forward. Secondly, compaction test and 7 days unconfined compressive strength test were carried out on the mixture. The performance of each mixture ratio is compared. The fourth part is the depth analysis, taking Chengnan Expressway as an example, discusses the feasibility of the application of soil curing agent on highway foundation and designs the test scheme. Dry shrinkage characteristic test and so on. The test results show that the use of soil curing agent in highway foundation can meet the design strength and stiffness requirements, and fully meet the construction needs. The fifth part is the field construction, through 200 meters of experimental road, the site with the third chapter of the best mix ratio to mix the mixture, instead of the original design of gravel foundation. The finished product was tested. The sixth part is the conclusion and prospect part.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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