徐楼铁矿充填体性能试验分析及地面沉降数值模拟

发布时间：2018-05-25 04:37

本文选题：地面沉降 + 采空区充填　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：随着世界经济的不断发展,资源消耗的不断增加。因为地下矿产资源开采而引起的地面沉降逐渐成为各大矿产资源国家共同面临的严重环境问题。我国作为一个矿业大国,铁矿储量十分丰富,矿山固体废弃物的积存量和排放量也非常巨大。矿区的区域性地面沉降现象频发,因此人们对于地面沉降的研究也越来越多。针对地面沉降现象,如何利用好矿山开采过程中排放出大量的尾矿,解决好环境污染和土地占用,同时有效地解决采空区塌陷等一系列问题已经成为了值得探讨研究的主题。目前普遍采用的方法是利用尾矿充填矿山采空区,一方面可以支撑围岩,另一方面也能有效降低矿石的贫化率。本文以安徽徐楼铁矿项目为背景,通过对国家现行绿色矿山政策的解读学习,在响应国家“安全矿山,绿色生产”的号召下,对尾矿充填材料的性能进行探究,找到适宜配比的充填体料浆进行充填,并通过数值模拟的方法对比分析了不同充填材料的地面沉降情况,主要结论如下:(1)通过对于绿色矿山理论的学习了解,对于环境保护政策的学习解读,提出了从政策、规模、交流三个方面来践行落实绿色发展观。并从徐楼矿区的实际情况出发,探索出了徐楼铁矿的特色充填工艺流程以及改进方式方法;(2)通过对于尾矿充填材料的探究试验,来确定充填技术方案的选择。进行塌落度以及强度试验,讨论了不同浓度、不同灰砂比、不同电厂粉煤灰占骨料比例等情况下充填材料的各项指标,并对不同情况予以分析,找出了适合于本工程的最优充填配比。在此基础上,对于充填胶结物进行改进探究,进一步节约资金;(3)采用Flac 3d数值模拟软件,通过对水平运输巷道的稳定性分析,来判断支护条件下是否适宜进行充填工作,建立模型,对比分析适宜配比的充填料浆和改进了胶结物条件下的充填料浆,两种不同条件下地面的沉降情况;(4)针对矿区地面沉降的地质灾害,分别从充填材料、开采方式、灾后治理三个方面来着手解决。
[Abstract]:With the development of the world economy, the consumption of resources is increasing. The ground subsidence caused by the exploitation of underground mineral resources has gradually become a serious environmental problem faced by many mineral resource countries. As a big mining country, China is rich in iron ore reserves, and the accumulation and discharge of solid waste is very huge. Regional land subsidence occurs frequently in mining area, so more and more people study land subsidence. In view of the phenomenon of land subsidence, how to make good use of a large amount of tailings in the mining process, solve the environmental pollution and land occupation, and effectively solve a series of problems, such as goaf collapse, etc., has become a subject worthy of discussion and study. At present, the commonly used method is to fill the goaf with tailings. On the one hand, it can support the surrounding rock, on the other hand, it can effectively reduce the ore dilution rate. Based on the project of Xulou Iron Mine in Anhui Province, this paper, by reading and studying the current green mine policy of the country, and responding to the call of "safe mine, green production", probes into the performance of tailings filling material. Find suitable filling slurry for filling, and compare and analyze the ground subsidence of different filling materials by numerical simulation method. The main conclusions are as follows: 1) through the study of green mine theory, For the study of environmental protection policy, put forward from the policy, scale, exchange three aspects to implement the green development concept. Based on the actual situation of Xulou mining area, this paper explores the characteristic filling process and improvement method of Xulou Iron Mine. The selection of filling technology scheme is determined by exploring and testing the filling materials of tailings. The collapse degree and strength test were carried out, and the indexes of filling material under different concentration, different ratio of ash to sand and ratio of fly ash to aggregate in different power plant were discussed, and the different conditions were analyzed. The optimum filling ratio suitable for this project has been found out. On this basis, the improvement of filling cement is explored, and further saving money is saved. Flac 3D numerical simulation software is used to determine whether it is appropriate to carry out filling work under the condition of support by analyzing the stability of horizontal transportation roadway. To establish a model, compare and analyze the suitable proportion of filling slurry and improve the filling slurry under the condition of cement. The ground subsidence under two different conditions is analyzed respectively from the filling material and the mining method, in view of the geological hazard of the ground subsidence in the mining area, respectively, according to the geological hazard of the land subsidence in the mining area. Three aspects of post-disaster governance to begin to solve.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD926.4;TD327

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