太原地区煤矸石作为回填材料的应用研究

发布时间：2019-06-29 18:04

【摘要】：近几年来,随着经济和社会的发展,我国的建筑行业和一些基础设施行业飞速发展,全国各地城市范围在不断扩张,高速公路、铁路在不断兴建,新农村建设在积极开展,所有这些工程的建设都需要大量的回填材料,然而我国土地资源比较有限,而且城市的扩张和道路的铺设,更加减少了我国的土地资源。面对越来越紧张的资源危机,政府开始重视我国现存量最大的工业固体废弃物资源——煤矸石,并大力支持开发研究煤矸石资源,将其应用于实际工程。本文简单介绍了一些关于煤矸石的基本特征,总结前人对煤矸石的介绍,将其简单分类。在前人对煤矸石研究的基础上,详细介绍了煤矸石对我国社会、环境和人类造成的严重污染和危害,以及目前我国对煤矸石的综合利用情况,说明了研究煤矸石的必要性。本文以太原煤炭交易中心展览中心工程为背景,以室内试验的方法对拟用煤矿的煤矸石进行了一系列的物理力学性能试验。通过化学成分分析试验,确定了该矿煤矸石中各种矿物质含量;采用筛分法进行颗粒级配试验,确定了煤矸石的颗粒级配特征;通过振动台试验,确定了煤矸石的最大干密度;利用大型渗透仪,测定了煤矸石的渗透系数,并进行水稳性的判定;采用大型三轴压缩试验,确定了煤矸石的本构模型参数等。通过上述一系列试验,验证了本文所用煤矸石具有良好的化学性能及工程特性。在室内试验的基础上,根据现场情况,借鉴以往利用煤矸石回填工程的经验,拟定了几种不同的现场回填施工方案,并且从理论分析的角度出发,利用实用沉降计算方法对几种不同方案回填后的场地计算其理论沉降量。同时采用大型有限元软件MIDAS/GTS对拟用煤矸石回填场地进行数值模拟分析,将三种工况的数值模拟计算结果进行分析对比,并将模拟分析结果和理论计算结果进行比较。经过对比分析验证了理论计算结果的正确性,并最终得出最佳施工方案和回填分层厚度,为现场施工提供了比较有参考价值的建议。本文的研究成果可以作为该工程现场回填方案的拟定和施工的依据之一,为相关类型工程提供了理论参考。
[Abstract]:In recent years, with the development of economy and society, the construction industry and some infrastructure industries in our country are developing rapidly, the scope of cities in all parts of the country is expanding, highways and railways are being built, and the construction of new countryside is being carried out actively. All these projects need a lot of backfill materials. However, the land resources of our country are relatively limited, and the expansion of cities and the laying of roads. It has reduced the land resources of our country even more. In the face of more and more tense resource crisis, the government began to attach importance to coal gangue, the largest industrial solid waste resource in China, and strongly supported the development and research of coal gangue resources and applied them to practical projects. In this paper, some basic characteristics of coal gangue are briefly introduced, and the previous introductions of coal gangue are summarized and classified simply. On the basis of previous studies on coal gangue, this paper introduces in detail the serious pollution and harm caused by coal gangue to our society, environment and human beings, as well as the comprehensive utilization of coal gangue in our country at present, and explains the necessity of studying coal gangue. In this paper, based on the exhibition center project of Taiyuan Coal Trading Center, a series of physical and mechanical properties tests of coal gangue to be used in coal mine are carried out by means of laboratory test. Through chemical composition analysis test, the content of various minerals in coal gangue was determined, the particle gradation test was carried out by screening method, the particle gradation characteristics of coal gangue were determined, the maximum dry density of coal gangue was determined by shaking table test, the permeability coefficient of coal gangue was measured by large osmotic instrument, and the water stability was determined. The constitutive model parameters of coal gangue were determined by large triaxial compression test. Through a series of experiments, it is verified that the coal gangue used in this paper has good chemical and engineering properties. On the basis of laboratory test, according to the field situation and drawing lessons from the experience of coal gangue backfill project in the past, several different site backfill construction schemes are worked out, and from the point of view of theoretical analysis, the theoretical settlement of the site after backfilling with several different schemes is calculated by using the practical settlement calculation method. At the same time, the large-scale finite element software MIDAS/GTS is used to simulate and analyze the proposed coal gangue backfill site. The numerical simulation results of the three working conditions are analyzed and compared, and the simulation analysis results are compared with the theoretical calculation results. The correctness of the theoretical calculation results is verified by comparative analysis, and the best construction scheme and backfill layer thickness are finally obtained, which provides valuable suggestions for field construction. The research results of this paper can be used as one of the basis for the formulation and construction of the site backfill scheme of the project, and provide a theoretical reference for the related types of projects.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：U414

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