【摘要】：永平銅礦露天轉(zhuǎn)地下開(kāi)采工作正在進(jìn)行,根據(jù)設(shè)計(jì)要求,地下開(kāi)采采用下行式充填法開(kāi)采,礦山目前正在進(jìn)行Ⅱ號(hào)礦體的開(kāi)采,設(shè)計(jì)的采礦方法為分段空?qǐng)龇ㄋ煤蟪涮?由于原設(shè)計(jì)為方案型的,因此,具體實(shí)施過(guò)程中急需結(jié)合工程實(shí)際情況對(duì)礦柱穩(wěn)定性及相關(guān)采礦工藝參數(shù)進(jìn)行優(yōu)化,以滿足實(shí)際生產(chǎn)的要求。為此,本文通過(guò)基礎(chǔ)資料收集、現(xiàn)場(chǎng)勘查、室內(nèi)試驗(yàn)、理論分析、數(shù)值計(jì)算等方法及手段,對(duì)采場(chǎng)結(jié)構(gòu)參數(shù)進(jìn)行了優(yōu)化,以達(dá)到提高采場(chǎng)穩(wěn)定性,同時(shí),減少開(kāi)采損失的目的。主要研究?jī)?nèi)容如下：(1)現(xiàn)場(chǎng)調(diào)查收集了永平銅礦礦區(qū)地質(zhì)、地質(zhì)構(gòu)造、結(jié)構(gòu)面特征、礦體賦存特征、水文地質(zhì)等資料。(2)通過(guò)現(xiàn)場(chǎng)調(diào)查及室內(nèi)巖石力學(xué)試驗(yàn),對(duì)礦區(qū)典型礦巖性質(zhì)進(jìn)行了系統(tǒng)研究,結(jié)合巖石力學(xué)結(jié)果,采用廣義Hoek-Brown準(zhǔn)則對(duì)巖石力學(xué)參數(shù)進(jìn)行折減,得到永平銅礦井下主要礦巖體強(qiáng)度參數(shù)。(3)現(xiàn)場(chǎng)取回尾砂樣進(jìn)行了含水率測(cè)試,并制備成標(biāo)準(zhǔn)膠結(jié)充填體試件,對(duì)養(yǎng)護(hù)齡期為28天灰砂比為1：4、1：10的尾砂膠結(jié)充填體進(jìn)行了單軸抗壓強(qiáng)度試驗(yàn)、巴西劈裂拉伸試驗(yàn)和角模壓剪試驗(yàn),得到膠結(jié)充填體強(qiáng)度參數(shù)。(4)將松散介質(zhì)下的階段礦柱簡(jiǎn)化為均布載荷下兩端固支梁,以楊森理論為前提,分析了松散介質(zhì)下階段礦柱的承載機(jī)理,推導(dǎo)了階段礦柱上部松散介質(zhì)荷載的通用計(jì)算公式。借助巖石張拉失穩(wěn)判據(jù),推導(dǎo)了松散介質(zhì)載荷下階段礦柱臨界破壞時(shí)階段礦柱最小預(yù)留安全厚度的計(jì)算公式,根據(jù)工程實(shí)際及試驗(yàn)得到了基礎(chǔ)數(shù)據(jù),計(jì)算了階段礦柱最小預(yù)留安全厚度的理論解。(5)利用ANSYS軟件,建立研究區(qū)段采場(chǎng)的三維模型,再采用FLAC3D軟件,分析了階段礦柱在靜力及爆破動(dòng)載荷條件下的穩(wěn)定性,并得到階段礦柱最優(yōu)尺寸的數(shù)值解。(6)綜合理論分析和數(shù)值計(jì)算,確定該礦山階段礦柱最優(yōu)尺寸。(7)為減少階段礦柱的永久損失,對(duì)礦房底部由原設(shè)計(jì)的散體充填改為1：4膠結(jié)充填進(jìn)行數(shù)值模擬,并對(duì)膠結(jié)充填體的分布和高度進(jìn)行優(yōu)化。(8)采用數(shù)值模擬的方法對(duì)礦房、礦柱尺寸、回采順序、間礦內(nèi)膠結(jié)充填體的分布和高度等采場(chǎng)結(jié)構(gòu)參數(shù)進(jìn)行了論證與優(yōu)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.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD853.34
，

本文編號(hào)：2278149