阶段采场充填体破坏机制及二步回采方案优化研究
发布时间：2019-05-22 18:43
【摘要】：阶段空场嗣后充填采矿法中充填体作为地下采矿工程的人工构筑结构,是控制采场地压的主要手段。阶段空场嗣后充填采矿法将矿块回采工作划分为一步矿房和二步矿柱回采,二步矿柱回采工程中一步采场充填体两侧为二步矿房,当二步矿房开采时,一步充填体便出现暴露于采空区的暴露面,随着充填体暴露面积的改变,使得一步充填体的应力场重新分布且使充填体易发生失稳破坏,对二步回采工程安全作业环境产生影响,因此有必要对二步矿柱回采过程中充填体的受力情况及破坏机制进行分析,同时为矿山回采方案进行优化设计。为此,本文针对迁西龙湾铁矿-110m矿体根据其工程地质条件及矿岩性质,采用阶段空场嗣后充填采矿法进行矿体回采工作,并设计回采方案,进行如下研究:基于损伤理论,结合阶段空场嗣后充填采矿工艺,建立二步矿柱回采过程中充填体受力模型,利用RFPA3D数值软件分析矿柱回采过程中充填体内部的受力状态以及揭示充填体细观破坏机制。以迁西龙湾铁矿矿山地质资料为背景,展开模拟相似材料的正交试验,利用相似定律进行以阶段空场嗣后充填采矿法为基础的相似模拟试验,分析矿柱回采过程中,充填体及其顶板发生应变场演化规律,研究充填体承载机制。基于龙湾铁矿的尾矿不同的力学特性参数,结合龙湾铁矿工程地质实际情况,利用有限元分析软件FLAC3D结合对充填体的破坏机制分析结果对二步矿房回采方案进行优化,探讨不同矿柱宽度条件下充填体的稳定性,优化矿柱结构参数。
[Abstract]:As the artificial structure of underground mining engineering, the filling body in the subsequent filling mining method is the main means to control the pressure of the mining site. The mining work of the block is divided into one-step mine room and two-step pillar mining method, and the two-step mine room is on both sides of the one-step stope filling body in the two-step pillar mining project, and when the two-step mining room is exploited, the mining work of the block is divided into one-step mining room and two-step pillar mining method. The one-step filling body appears exposed to the goaf. With the change of the exposed area of the filling body, the stress field of the one-step filling body is redistributed and the filling body is prone to instability and failure. The safe working environment of the two-step mining project is affected, so it is necessary to analyze the force and failure mechanism of the filling body in the process of two-step pillar mining, and to optimize the design of the mine mining scheme at the same time. Therefore, according to its engineering geological conditions and ore and rock properties, this paper adopts the stage open field subsequent filling mining method to carry on the orebody mining work, and designs the mining scheme, and carries on the following research: based on the damage theory, Combined with the subsequent filling mining technology in the stage open field, the stress model of the filling body in the process of two-step pillar mining is established, and the internal stress state of the filling body in the process of pillar mining is analyzed by using RFPA3D numerical software, and the meso-failure mechanism of the filling body is revealed. Based on the geological data of Qianxilongwan Iron Mine, the orthogonal test of simulating similar materials is carried out, and the similar simulation test based on the subsequent filling mining method of stage open field is carried out by using similarity law, and the process of pillar mining is analyzed. The strain field evolution of the filling body and its roof is studied, and the bearing mechanism of the filling body is studied. Based on the different mechanical properties of the tailings of Longwan Iron Mine and the actual engineering geology of Longwan Iron Mine, the mining scheme of the second step mine is optimized by using the finite element analysis software FLAC3D combined with the analysis results of the failure mechanism of the filling body. The stability of filling body under different pillar width is discussed and the structural parameters of pillar are optimized.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD853.34;TD861.1
本文编号：2483157
[Abstract]:As the artificial structure of underground mining engineering, the filling body in the subsequent filling mining method is the main means to control the pressure of the mining site. The mining work of the block is divided into one-step mine room and two-step pillar mining method, and the two-step mine room is on both sides of the one-step stope filling body in the two-step pillar mining project, and when the two-step mining room is exploited, the mining work of the block is divided into one-step mining room and two-step pillar mining method. The one-step filling body appears exposed to the goaf. With the change of the exposed area of the filling body, the stress field of the one-step filling body is redistributed and the filling body is prone to instability and failure. The safe working environment of the two-step mining project is affected, so it is necessary to analyze the force and failure mechanism of the filling body in the process of two-step pillar mining, and to optimize the design of the mine mining scheme at the same time. Therefore, according to its engineering geological conditions and ore and rock properties, this paper adopts the stage open field subsequent filling mining method to carry on the orebody mining work, and designs the mining scheme, and carries on the following research: based on the damage theory, Combined with the subsequent filling mining technology in the stage open field, the stress model of the filling body in the process of two-step pillar mining is established, and the internal stress state of the filling body in the process of pillar mining is analyzed by using RFPA3D numerical software, and the meso-failure mechanism of the filling body is revealed. Based on the geological data of Qianxilongwan Iron Mine, the orthogonal test of simulating similar materials is carried out, and the similar simulation test based on the subsequent filling mining method of stage open field is carried out by using similarity law, and the process of pillar mining is analyzed. The strain field evolution of the filling body and its roof is studied, and the bearing mechanism of the filling body is studied. Based on the different mechanical properties of the tailings of Longwan Iron Mine and the actual engineering geology of Longwan Iron Mine, the mining scheme of the second step mine is optimized by using the finite element analysis software FLAC3D combined with the analysis results of the failure mechanism of the filling body. The stability of filling body under different pillar width is discussed and the structural parameters of pillar are optimized.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD853.34;TD861.1
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