本文選題：沖擊礦壓 + 靜載荷��； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：星村煤礦屬于千米深井,西翼三采區(qū)平均深度為1200m,最深的工作面達(dá)到了1300m。采深增加致使深部煤巖體應(yīng)力水平隨之升高,礦山壓力顯現(xiàn)更加劇烈和復(fù)雜,尤其是沖擊礦壓的頻度和烈度不斷增加。深部礦井自重應(yīng)力大,受構(gòu)造和采動(dòng)影響之后產(chǎn)生的靜載荷高,往往近處較小的震動(dòng)或者遠(yuǎn)處較大的礦震就能誘發(fā)沖擊。所以深部礦井由靜載荷占主導(dǎo),動(dòng)載荷很大程度上起誘發(fā)沖擊的作用,因此研究深部礦井沖擊礦壓發(fā)生原理對(duì)于保障煤礦深部安全開采具有重要意義。本文通過理論分析、現(xiàn)場(chǎng)實(shí)測(cè)、數(shù)值模擬等方式對(duì)星村煤礦深部采區(qū)靜載荷的構(gòu)成進(jìn)行研究,并對(duì)深部礦井與淺部礦井動(dòng)靜載的區(qū)別進(jìn)行分析,總結(jié)出深部載荷所獨(dú)有的特點(diǎn),據(jù)此進(jìn)行相應(yīng)的防治。對(duì)于動(dòng)載荷,結(jié)合現(xiàn)場(chǎng)實(shí)踐分析了礦震與沖擊的主要區(qū)別,并理論分析了頂板破斷、斷層運(yùn)動(dòng)誘發(fā)的震動(dòng)及其對(duì)沖擊的影響。最后結(jié)合動(dòng)靜載疊加誘沖機(jī)理及深部動(dòng)載荷和靜載荷構(gòu)成特點(diǎn),分析深部“小動(dòng)大靜”、“大動(dòng)遠(yuǎn)距”的沖擊發(fā)生原理,并結(jié)合實(shí)際案例進(jìn)行分析。深部礦井采深大造成自重應(yīng)力高,受構(gòu)造、采掘等因素影響導(dǎo)致靜載荷遠(yuǎn)大于一般淺部礦井;對(duì)星村礦西翼三采區(qū)地應(yīng)力進(jìn)行觀測(cè),實(shí)測(cè)礦區(qū)各點(diǎn)垂直應(yīng)力為31.3~31.6MPa,最大水平應(yīng)力為67.9MPa,最大水平應(yīng)力與垂直應(yīng)力的比值約為2.1,構(gòu)造應(yīng)力作用強(qiáng)烈;采用FLAC3D數(shù)值模擬軟件對(duì)3308工作面周圍應(yīng)力狀態(tài)及回采中應(yīng)力分布進(jìn)行了模擬,3308工作面擴(kuò)面期間、斷層處應(yīng)力集中,回采時(shí)工作前方應(yīng)力疊加,靜載荷進(jìn)一步加大。沖擊礦壓與礦震是并存關(guān)系,每一次沖擊礦壓的發(fā)生都與巖體震動(dòng)有關(guān),但并非每一次巖體震動(dòng)都會(huì)引發(fā)沖擊礦壓。本文對(duì)頂板破斷、斷層運(yùn)動(dòng)誘發(fā)的沖擊進(jìn)行分析,頂板初次來壓、周期來壓、見方期間工作面周圍應(yīng)力均會(huì)產(chǎn)生集中,同時(shí)頂板斷裂產(chǎn)生的震動(dòng)能量也達(dá)到最大,動(dòng)靜載峰值重疊極易誘發(fā)沖擊;斷層周圍往往應(yīng)力集中且斷層破碎帶煤巖破碎,巷道維護(hù)困難,工作面采動(dòng)靠近斷層20m以內(nèi),斷層會(huì)造成工作面頂板急劇下沉、頂板斷裂,頂板中積聚的彈性能突然釋放形成高能礦震誘發(fā)沖擊。本文對(duì)支護(hù)系統(tǒng)的抗沖能力進(jìn)行了分析,星村煤礦支護(hù)系統(tǒng)所能抵抗的礦震能量等級(jí)為4.5~6.1k J/m2。根據(jù)動(dòng)靜載疊加誘沖機(jī)理,分析了星村煤礦3308工作面沖擊礦壓影響因素,對(duì)工作面沖擊危險(xiǎn)性進(jìn)行了評(píng)價(jià),提出了沖擊礦壓的日常及重點(diǎn)預(yù)防區(qū)域和治理措施,指導(dǎo)了星村煤礦西翼三采區(qū)3308工作面生產(chǎn)實(shí)際,取得了良好的效果。
[Abstract]:Xingcun coal mine belongs to a kilometer deep well, the average depth of the third mining area of the west wing is 1200 m, and the deepest working face reaches 1300 m. With the increase of mining depth, the stress level of deep coal and rock mass will increase, and the mine pressure will become more intense and complex, especially the frequency and intensity of rock burst. Because of the large gravity stress and the high static load caused by the structure and mining, the deep mine can be impacted by the smaller vibration near the mine or the bigger mine shock in the distance. So the deep mine is dominated by static load and the dynamic load plays an important role in inducing shock to a great extent. Therefore, it is of great significance to study the occurrence principle of rock burst in deep mine to ensure safe mining in deep coal mine. In this paper, the structure of static load in deep mining area of Xingcun Coal Mine is studied by means of theoretical analysis, field measurement and numerical simulation, and the difference between static and static load of deep mine and shallow mine is analyzed, and the unique characteristics of deep load are summarized. According to this, the corresponding prevention and cure were carried out. For the dynamic load, combined with the field practice, the main differences between the mine earthquake and the shock are analyzed, and the roof breaking, the vibration induced by the fault movement and its impact on the impact are theoretically analyzed. Finally, combined with the mechanism of static and static load superposition and the characteristics of deep dynamic load and static load, this paper analyzes the principle of shock generation of deep "small dynamic and large static" and "large moving distance", and analyzes the impact mechanism of deep "small moving large static" and "large moving distance", and analyzes it with practical cases. Under the influence of structure and excavation, the static load of deep mine is much larger than that of shallow mine, and the ground stress in the third mining area of the west wing of Xingcun Mine is observed. The vertical stress and the maximum horizontal stress are 31.3and 31.6MPa respectively, and the ratio of the maximum horizontal stress to the vertical stress is about 2.1. The tectonic stress is strong. The stress state around 3308 working face and the stress distribution in mining are simulated by using FLAC3D numerical simulation software. The stress concentration at fault is simulated during the expanding face of No. 3308 working face, and the stress superposition in front of work during mining, and the static load is further increased. The relation between rock shock and rock shock is coexisting. The occurrence of each impact rock pressure is related to rock mass vibration, but not every rock mass shock will lead to rock impact pressure. In this paper, the impact induced by roof breaking and fault movement is analyzed. The initial pressure of roof, periodic pressure and stress around the working face are all concentrated, and the vibration energy caused by roof fracture is also maximum. The peak value of static and static load is easy to induce shock, the stress around the fault is often concentrated and the coal and rock in the broken zone of the fault are broken, the maintenance of the roadway is difficult, the mining face is close to the fault within 20m, the fault will cause the roof of the face to sink sharply and the roof to break. The accumulated elastic energy in the roof suddenly releases to form a high-energy mine shock induced shock. In this paper, the impact resistance of the support system is analyzed. The earthquake energy grade of the support system in Xingcun coal mine is 4.5 ~ 6.1k / m ~ (2). According to the inductive mechanism of static and static load superposition, this paper analyzes the influence factors of impact rock pressure in No. 3308 face of Xingcun Coal Mine, evaluates the impact risk of working face, and puts forward the daily and key prevention areas and control measures of impact rock pressure. The production practice of No. 3308 working face in the third mining area of west wing of Xingcun Coal Mine has been guided, and good results have been obtained.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD324

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本文編號(hào)：2102677