本文選題：含水煤層 + 底板強(qiáng)度弱化��； 參考：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文

【摘要】：水害一直是制約煤礦安全生產(chǎn)的重大隱患之一,礦井在巷道掘進(jìn)時(shí)期,圍巖因吸水膨脹其強(qiáng)度弱化、變形加劇,而井下疏排水引起巷道斷面尺寸變化更會(huì)加劇巷道圍巖變形。小紀(jì)汗煤礦首次發(fā)現(xiàn)煤層為含水層且為主要承壓含水層,在此特殊水文地質(zhì)工程背景下,開(kāi)展含水煤層巷道變形機(jī)理研究,對(duì)指導(dǎo)礦井安全生產(chǎn)具有重要的理論與實(shí)際意義。論文主要研究?jī)?nèi)容及成果如下:(1)針對(duì)該礦井巷道底板條件,現(xiàn)場(chǎng)取樣對(duì)底板巖石礦物組成成分、巖石膨脹性、水作用下巖石強(qiáng)度弱化規(guī)律進(jìn)行系統(tǒng)的試驗(yàn)研究。發(fā)現(xiàn)巖石中含蒙脫石、伊利石等膨脹性礦物質(zhì)是圍巖膨脹變形的微觀影響因素,底板巖石遇水后產(chǎn)生的高膨脹應(yīng)力、較大變形量宏觀表象為圍巖變形。給出巷道底板粉砂質(zhì)泥巖抗拉強(qiáng)度、單軸抗壓強(qiáng)度及彈性模量隨含水率、不同浸水時(shí)間變化而弱化規(guī)律函數(shù),為數(shù)值模擬研究提供參數(shù)依據(jù)。(2)運(yùn)用巖體彈塑性力學(xué)知識(shí),考慮圍巖體強(qiáng)度衰減和應(yīng)變軟化特點(diǎn),對(duì)巷道圍巖塑性區(qū)半徑及變形特征展開(kāi)理論研究,給出圍巖塑性區(qū)半徑、圍巖內(nèi)任意一點(diǎn)應(yīng)力和巷道表面圍巖位移量的解析式。發(fā)現(xiàn)相比無(wú)水作用下,水作用后巷道塑性區(qū)半徑明顯增大,巷道圍巖表面位移量隨巖石軟化程度增加而增大。(3)建立不同含水率狀態(tài)下巷道圍巖數(shù)值計(jì)算模型,FLAC3D數(shù)值分析巷道開(kāi)挖過(guò)程圍巖強(qiáng)度特性隨含水量增大而弱化特征,模擬研究巷道圍巖應(yīng)力應(yīng)變、塑性區(qū)分布及圍巖表面變形量,發(fā)現(xiàn)圍巖變形量隨巖石含水率增加而增大,從而揭示含水煤層巷道圍巖變形基本原理及規(guī)律。(4)結(jié)合小紀(jì)汗煤礦巷道圍巖破壞特征工程實(shí)際,分析圍巖變形影響因素為地下水對(duì)底板巖層強(qiáng)度的軟化及圍巖遇水膨脹。統(tǒng)計(jì)分析巷道圍巖各點(diǎn)變形量,結(jié)果表明數(shù)值計(jì)算分析與現(xiàn)場(chǎng)實(shí)測(cè)規(guī)律一致。本文以小紀(jì)汗煤礦含水煤層巷道為研究對(duì)象,研究成果應(yīng)用于現(xiàn)場(chǎng)工程設(shè)計(jì)及施工,表明開(kāi)展含水煤層巷道變形機(jī)理研究對(duì)礦井安全生產(chǎn)具有重要意義。
[Abstract]:Water hazard has always been one of the major hidden dangers restricting the safe production of coal mine. In the period of roadway excavation, the strength of surrounding rock is weakened due to water absorption and swelling, and the deformation is aggravated, while the change of tunnel section size caused by underground drainage will aggravate the deformation of roadway surrounding rock. It is the first time that coal seam is found as aquifer and main confined aquifer in Xiaojihan coal mine. Under this special hydrogeological engineering background, it is of great theoretical and practical significance to study the mechanism of roadway deformation in water-bearing coal seam. The main contents and achievements of this paper are as follows: (1) according to the conditions of the mine roadway floor, the rock mineral composition, rock expansion and the weakening law of rock strength under the action of water are systematically studied by field sampling. It is found that the swelling minerals such as montmorillonite and Illite are the microcosmic factors influencing the swelling deformation of the surrounding rock. The high expansion stress of the bottom rock and the macroscopic appearance of the large amount of deformation are the deformation of the surrounding rock. The function of weakening law of tensile strength, uniaxial compressive strength and elastic modulus of silty mudstone in roadway floor with water content and different soaking time is given, which provides parameter basis for numerical simulation. (2) using elastoplastic mechanics knowledge of rock mass. Considering the characteristics of strength attenuation and strain softening of surrounding rock mass, the radius and deformation characteristics of surrounding rock plastic zone of roadway are studied theoretically. The analytical formulas of radius of plastic zone of surrounding rock, stress of any point in surrounding rock and displacement of surrounding rock surface of roadway are given. It is found that the radius of the plastic zone of the roadway increases obviously after the action of water compared with that under the action of no water. The displacement of surrounding rock surface increases with the increase of rock softening degree. (3) the numerical calculation model of surrounding rock in different water content is established and FLAC3D numerical analysis shows that the strength characteristic of surrounding rock weakens with the increase of water content in roadway excavation process. The stress and strain of surrounding rock, the distribution of plastic zone and the amount of deformation of surrounding rock surface are simulated. It is found that the deformation of surrounding rock increases with the increase of water content of rock. Therefore, the basic principle and law of surrounding rock deformation in water-bearing coal seam roadway are revealed. (4) in combination with the engineering practice of surrounding rock failure characteristics of roadway in Xiaojihan coal mine, the influencing factors of surrounding rock deformation are the softening of underground water to the strength of floor rock and the swelling of surrounding rock in water. The results show that the numerical analysis is consistent with the field measurement. This paper takes the water-bearing coal seam roadway of Xiaojihan coal mine as the research object, and the research results are applied to the field engineering design and construction, which indicates that the research on the deformation mechanism of the water-bearing coal seam roadway is of great significance to the mine safety production.
【學(xué)位授予單位】：中國(guó)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)】：TD322

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