【摘要】：階段空場嗣后充填采礦法中充填體作為地下采礦工程的人工構(gòu)筑結(jié)構(gòu),是控制采場地壓的主要手段。階段空場嗣后充填采礦法將礦塊回采工作劃分為一步礦房和二步礦柱回采,二步礦柱回采工程中一步采場充填體兩側(cè)為二步礦房,當(dāng)二步礦房開采時,一步充填體便出現(xiàn)暴露于采空區(qū)的暴露面,隨著充填體暴露面積的改變,使得一步充填體的應(yīng)力場重新分布且使充填體易發(fā)生失穩(wěn)破壞,對二步回采工程安全作業(yè)環(huán)境產(chǎn)生影響,因此有必要對二步礦柱回采過程中充填體的受力情況及破壞機制進行分析,同時為礦山回采方案進行優(yōu)化設(shè)計。為此,本文針對遷西龍灣鐵礦-110m礦體根據(jù)其工程地質(zhì)條件及礦巖性質(zhì),采用階段空場嗣后充填采礦法進行礦體回采工作,并設(shè)計回采方案,進行如下研究:基于損傷理論,結(jié)合階段空場嗣后充填采礦工藝,建立二步礦柱回采過程中充填體受力模型,利用RFPA3D數(shù)值軟件分析礦柱回采過程中充填體內(nèi)部的受力狀態(tài)以及揭示充填體細觀破壞機制。以遷西龍灣鐵礦礦山地質(zhì)資料為背景,展開模擬相似材料的正交試驗,利用相似定律進行以階段空場嗣后充填采礦法為基礎(chǔ)的相似模擬試驗,分析礦柱回采過程中,充填體及其頂板發(fā)生應(yīng)變場演化規(guī)律,研究充填體承載機制�；邶垶宠F礦的尾礦不同的力學(xué)特性參數(shù),結(jié)合龍灣鐵礦工程地質(zhì)實際情況,利用有限元分析軟件FLAC3D結(jié)合對充填體的破壞機制分析結(jié)果對二步礦房回采方案進行優(yōu)化,探討不同礦柱寬度條件下充填體的穩(wěn)定性,優(yōu)化礦柱結(jié)構(gòu)參數(shù)。
[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.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD853.34;TD861.1

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