分段空场嗣后充填采场结构参数优化试验与理论研究
发布时间：2018-10-17 22:03
【摘要】：永平铜矿露天转地下开采工作正在进行,根据设计要求,地下开采采用下行式充填法开采,矿山目前正在进行Ⅱ号矿体的开采,设计的采矿方法为分段空场法嗣后充填,由于原设计为方案型的,因此,具体实施过程中急需结合工程实际情况对矿柱稳定性及相关采矿工艺参数进行优化,以满足实际生产的要求。为此,本文通过基础资料收集、现场勘查、室内试验、理论分析、数值计算等方法及手段,对采场结构参数进行了优化,以达到提高采场稳定性,同时,减少开采损失的目的。主要研究内容如下：(1)现场调查收集了永平铜矿矿区地质、地质构造、结构面特征、矿体赋存特征、水文地质等资料。(2)通过现场调查及室内岩石力学试验,对矿区典型矿岩性质进行了系统研究,结合岩石力学结果,采用广义Hoek-Brown准则对岩石力学参数进行折减,得到永平铜矿井下主要矿岩体强度参数。(3)现场取回尾砂样进行了含水率测试,并制备成标准胶结充填体试件,对养护龄期为28天灰砂比为1：4、1：10的尾砂胶结充填体进行了单轴抗压强度试验、巴西劈裂拉伸试验和角模压剪试验,得到胶结充填体强度参数。(4)将松散介质下的阶段矿柱简化为均布载荷下两端固支梁,以杨森理论为前提,分析了松散介质下阶段矿柱的承载机理,推导了阶段矿柱上部松散介质荷载的通用计算公式。借助岩石张拉失稳判据,推导了松散介质载荷下阶段矿柱临界破坏时阶段矿柱最小预留安全厚度的计算公式,根据工程实际及试验得到了基础数据,计算了阶段矿柱最小预留安全厚度的理论解。(5)利用ANSYS软件,建立研究区段采场的三维模型,再采用FLAC3D软件,分析了阶段矿柱在静力及爆破动载荷条件下的稳定性,并得到阶段矿柱最优尺寸的数值解。(6)综合理论分析和数值计算,确定该矿山阶段矿柱最优尺寸。(7)为减少阶段矿柱的永久损失,对矿房底部由原设计的散体充填改为1：4胶结充填进行数值模拟,并对胶结充填体的分布和高度进行优化。(8)采用数值模拟的方法对矿房、矿柱尺寸、回采顺序、间矿内胶结充填体的分布和高度等采场结构参数进行了论证与优化。
[Abstract]:The opencast to underground mining of Yongping Copper Mine is under way. According to the design requirements, the downlink filling method is used in underground mining. At present, the No. 2 orebody is being mined in the mine. Because the original design is of the scheme type, it is urgent to optimize the pillar stability and related mining process parameters in the process of concrete implementation in order to meet the requirements of actual production. In order to improve the stope stability and reduce the mining loss, this paper optimizes the stope structure parameters by means of basic data collection, field investigation, laboratory test, theoretical analysis, numerical calculation and so on. The main research contents are as follows: (1) the data of geology, geological structure, structural plane, occurrence of orebody, hydrogeology and so on have been collected in the field investigation of Yongping Copper Mine. (2) through field investigation and indoor rock mechanics test, The characteristics of typical ore and rock in mining area are studied systematically. Combined with the results of rock mechanics, the generalized Hoek-Brown criterion is used to reduce the mechanical parameters of rock. The strength parameters of the main underground rock mass in Yongping Copper Mine are obtained. (3) the moisture content of the tailings is measured and the standard cemented backfill specimen is prepared. Uniaxial compressive strength tests, splitting tensile tests and angular moulding shear tests were carried out on the tailings cemented filling with a ratio of 1: 4 to 1: 10 for 28 days of curing age. The strength parameters of cemented filling body are obtained. (4) the stage pillar in loose medium is simplified as a fixed beam at both ends under uniform load. Based on Yang Sen's theory, the bearing mechanism of pillar in loose medium is analyzed. The general calculation formula of the loose medium load on the upper part of the pillar is derived. Based on the criterion of rock tensioning instability, the formula for calculating the minimum reserved safe thickness of pillar in the stage of critical failure of ore pillar under loose medium load is derived, and the basic data are obtained according to the engineering practice and test. The theoretical solution of the minimum reserved safe thickness of the stage pillar is calculated. (5) by using ANSYS software, the three-dimensional model of the study section stope is established, and the stability of the stage pillar under static and blasting dynamic loads is analyzed by using FLAC3D software. The numerical solution of the optimum size of the stage pillar is obtained. (6) the optimum size of the pillar in this stage is determined by comprehensive theoretical analysis and numerical calculation. (7) in order to reduce the permanent loss of the pillar in the stage, Numerical simulation is carried out on the bottom of the mine house from the original design of bulk filling to 1:4 cemented filling, and the distribution and height of cemented backfill are optimized. (8) the size and mining sequence of ore house, pillar and stoping are numerically simulated. The distribution and height of cemented backfill are demonstrated and optimized.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD853.34
，
本文编号：2278149
[Abstract]:The opencast to underground mining of Yongping Copper Mine is under way. According to the design requirements, the downlink filling method is used in underground mining. At present, the No. 2 orebody is being mined in the mine. Because the original design is of the scheme type, it is urgent to optimize the pillar stability and related mining process parameters in the process of concrete implementation in order to meet the requirements of actual production. In order to improve the stope stability and reduce the mining loss, this paper optimizes the stope structure parameters by means of basic data collection, field investigation, laboratory test, theoretical analysis, numerical calculation and so on. The main research contents are as follows: (1) the data of geology, geological structure, structural plane, occurrence of orebody, hydrogeology and so on have been collected in the field investigation of Yongping Copper Mine. (2) through field investigation and indoor rock mechanics test, The characteristics of typical ore and rock in mining area are studied systematically. Combined with the results of rock mechanics, the generalized Hoek-Brown criterion is used to reduce the mechanical parameters of rock. The strength parameters of the main underground rock mass in Yongping Copper Mine are obtained. (3) the moisture content of the tailings is measured and the standard cemented backfill specimen is prepared. Uniaxial compressive strength tests, splitting tensile tests and angular moulding shear tests were carried out on the tailings cemented filling with a ratio of 1: 4 to 1: 10 for 28 days of curing age. The strength parameters of cemented filling body are obtained. (4) the stage pillar in loose medium is simplified as a fixed beam at both ends under uniform load. Based on Yang Sen's theory, the bearing mechanism of pillar in loose medium is analyzed. The general calculation formula of the loose medium load on the upper part of the pillar is derived. Based on the criterion of rock tensioning instability, the formula for calculating the minimum reserved safe thickness of pillar in the stage of critical failure of ore pillar under loose medium load is derived, and the basic data are obtained according to the engineering practice and test. The theoretical solution of the minimum reserved safe thickness of the stage pillar is calculated. (5) by using ANSYS software, the three-dimensional model of the study section stope is established, and the stability of the stage pillar under static and blasting dynamic loads is analyzed by using FLAC3D software. The numerical solution of the optimum size of the stage pillar is obtained. (6) the optimum size of the pillar in this stage is determined by comprehensive theoretical analysis and numerical calculation. (7) in order to reduce the permanent loss of the pillar in the stage, Numerical simulation is carried out on the bottom of the mine house from the original design of bulk filling to 1:4 cemented filling, and the distribution and height of cemented backfill are optimized. (8) the size and mining sequence of ore house, pillar and stoping are numerically simulated. The distribution and height of cemented backfill are demonstrated and optimized.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD853.34
，
本文编号：2278149
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