本文選題：條帶式 + 殘煤復(fù)采�。� 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：一直以來，煤炭作為我國能源行業(yè)的主體，在國民經(jīng)濟(jì)的發(fā)展中起著很重要的作用。但是我國煤炭資源一直存在著回采率低、資源浪費(fèi)的現(xiàn)象。在當(dāng)前我國煤炭資源需求量巨大且不斷增長的情況下，提高煤炭資源回收率勢在必行，進(jìn)行已采煤層的復(fù)采是提高煤炭回收率的重要途徑。而且對于煤礦企業(yè)而言，復(fù)采能夠提高經(jīng)濟(jì)效益，有效解決礦井的采掘接替，延長衰老礦井的服務(wù)年限。 本文針對條帶式殘煤賦存實際情況，運(yùn)用彈性力學(xué)分析，三維相似模擬試驗和數(shù)值模擬相結(jié)合的方法，對條帶式殘煤復(fù)采進(jìn)行基礎(chǔ)性的分析研究。 針對條帶式采煤法開采后的煤層殘留的煤炭資源，本文對殘留煤柱及煤柱頂板進(jìn)行受力分析。根據(jù)AH Wilson煤柱理論，條帶煤柱由于不同的受力作用分為邊緣屈服區(qū)和內(nèi)部核心區(qū),而頂板應(yīng)力主要由煤柱核區(qū)承擔(dān)，煤柱邊緣由于應(yīng)力集中作用下孔隙裂隙較為發(fā)育。煤柱上方頂板受三軸應(yīng)力作用，舊采空巷上方頂板由于沒有煤柱的支撐而易破斷、垮落。 在受力分析的基礎(chǔ)上，針對山西煤炭運(yùn)銷集團(tuán)陽城西河煤業(yè)的地質(zhì)條件及煤層賦存狀況，利用太原理工大學(xué)自行研制的三維試驗臺進(jìn)行模擬試驗。考慮工作面現(xiàn)場實際狀況，試驗設(shè)計不同形式的復(fù)采工作面：房柱式、條帶式以及房柱式和條帶式混采的工作面。試驗設(shè)計分兩步開采，第一步以柱式開采法對煤層初次模擬開采，間隔一定時間后，第二步針對舊采殘煤進(jìn)行模擬復(fù)采。在模擬過程中觀察記錄頂板應(yīng)力、頂板下沉位移以及相關(guān)的試驗現(xiàn)象。本文詳細(xì)闡述了30°傾角條帶式工作面復(fù)采過程中開切眼、斜過空巷時頂板應(yīng)力和位移的變化規(guī)律和圍巖破壞規(guī)律,老頂?shù)某醮蝸韷汉椭芷趤韷翰骄嘁约皝韷含F(xiàn)象。 依據(jù)試驗?zāi)M和工程實踐，文章以陽城西河煤業(yè)實際賦存條件為基礎(chǔ)建立了殘煤復(fù)采的有限元模型，利用FORTRAN語言編寫有限元程序?qū)l帶式殘煤復(fù)采進(jìn)行數(shù)值模擬。模擬結(jié)果顯示：工作面橫過空巷對頂板和煤柱上的應(yīng)力分布有很大影響，，橫過空巷使工作面前方頂板應(yīng)力重新分布，煤柱受力狀態(tài)改變。
[Abstract]:Coal, as the main body of energy industry, plays an important role in the development of national economy. However, there is a phenomenon of low recovery rate and waste of coal resources in China. With the huge and increasing demand for coal resources in China, it is imperative to improve the recovery rate of coal resources, and it is an important way to improve the recovery rate of coal seams. Moreover, for coal mining enterprises, remining can improve economic efficiency, effectively solve the mining replacement of mines, and prolong the service life of aging mines. In this paper, according to the actual situation of the occurrence of strip residual coal, the basic analysis and research on the remining of strip residual coal are carried out by using the method of elastic mechanics analysis, three-dimensional similarity simulation test and numerical simulation. Aiming at the residual coal resources of coal seam after strip mining, this paper analyzes the residual coal pillar and the roof of coal pillar. According to the AH Wilson pillar theory, the strip pillar is divided into the edge yield zone and the inner core area due to different forces, while the roof stress is mainly borne by the coal pillar core area, and the pore fissure is more developed in the coal pillar edge because of the stress concentration. The roof above the coal pillar is subjected to triaxial stress, and the roof above the old goaf roadway is easy to break and collapse because there is no pillar support. On the basis of stress analysis, aiming at the geological conditions and coal seam occurrence status of Xihe coal industry in Yangcheng city of Shanxi Coal Transportation and Marketing Group, a simulation test was carried out on a three-dimensional test-bed developed by Taiyuan University of Science and Technology. Considering the actual situation of the working face, different types of remining face are designed and tested: roof pillar type, strip type, roof pillar type and strip type mixed mining face. The test design is divided into two steps. The first step is the first simulated mining of coal seam by pillar mining method. After a certain time interval, the second step is simulated remining for the old mining residual coal. In the course of simulation, the roof stress, roof sinking displacement and related experimental phenomena were observed and recorded. In this paper, the variation law of roof stress and displacement and surrounding rock failure law, the first and periodic pressure step and pressure phenomenon of main roof during the remining process of 30 擄inclined strip working face are described in detail. Based on the experimental simulation and engineering practice, the finite element model of residual coal mining is established on the basis of the actual occurrence conditions of Xihe coal industry in Yangcheng city. The finite element program written by FORTRAN language is used to simulate the remining of strip residual coal. The simulation results show that the stress distribution on the roof and coal pillar is greatly affected by the cross goaf of the working face, and the stress distribution of the roof in front of the face is redistributed and the stress state of the coal pillar changes by crossing the goaf.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD322

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