本文選題：弱膠結(jié)軟巖 + 托頂煤巷道��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：本文以紅慶梁煤礦11301工作面回風(fēng)順槽為工程背景,采用室內(nèi)試驗(yàn)、理論分析、數(shù)值模擬和現(xiàn)場(chǎng)監(jiān)測(cè)相結(jié)合的方法,分析托頂煤巷道頂板變形破壞規(guī)律,揭示了針對(duì)弱膠結(jié)軟巖托頂煤巷道頂板錨桿錨索作用機(jī)理,為托頂煤巷道支護(hù)優(yōu)化設(shè)計(jì)提供理論依據(jù)。主要的研究?jī)?nèi)容及結(jié)論有:(1)通過(guò)室內(nèi)試驗(yàn),測(cè)得了 11301工作面順槽頂煤及不同深度上覆泥巖力學(xué)參數(shù),分析可知頂板近煤層泥巖與遠(yuǎn)煤層泥巖力學(xué)性質(zhì)不同,結(jié)合巖石浸水試驗(yàn)分析得知該工作面托頂煤巷道頂板泥巖具有典型軟巖特性,現(xiàn)場(chǎng)頂板鉆孔電視探測(cè)發(fā)現(xiàn),11301工作面托頂煤巷道頂板泥巖中下部層位出現(xiàn)離層,泥巖明顯分層。(2)通過(guò)構(gòu)建托頂煤巷道結(jié)構(gòu)力學(xué)模型,給出了幫煤在水平應(yīng)力作用下對(duì)頂煤產(chǎn)生彎矩的表達(dá)式,該彎矩削弱了垂直應(yīng)力對(duì)頂煤的作用,表明弱膠結(jié)軟巖托頂煤巷道頂煤對(duì)頂板穩(wěn)定性具有促進(jìn)作用。(3)根據(jù)頂板煤巖層受力狀態(tài)分析,通過(guò)理論分析提出用煤梁與巖梁彈性模量比值作為頂煤與近煤層泥巖是否發(fā)生離層的依據(jù),求得了考慮幫煤對(duì)頂煤彎矩作用下的頂煤與近煤層泥巖所受最大拉應(yīng)力表達(dá)式,并以此作為頂板失穩(wěn)破壞判據(jù)。(4)數(shù)值模擬研究表明,可通過(guò)調(diào)節(jié)頂板煤層厚度促進(jìn)巷道頂板安全穩(wěn)定,11301回風(fēng)順槽適宜頂煤厚度為1.5-1.75m。頂煤賦存穩(wěn)定,且頂煤對(duì)巷道頂板穩(wěn)定具有促進(jìn)作用,提出適合于弱膠結(jié)軟巖托頂煤巷道頂板錨固支護(hù)設(shè)計(jì)的“淺層加固梁”支護(hù)模型。(5)基于“淺層加固梁”支護(hù)模型研究分析,弱膠結(jié)軟巖托頂煤巷道頂板錨桿主要作用為錨固頂煤與近煤層泥巖,使之成為加固梁,等效增加錨固體彈性模量,提高錨固體強(qiáng)度,為錨索支護(hù)提供穩(wěn)定基礎(chǔ)。依據(jù)該模型分析,對(duì)11301工作面順槽支護(hù)方案進(jìn)行優(yōu)化,現(xiàn)場(chǎng)應(yīng)用取得良好效果。
[Abstract]:In this paper, based on the engineering background of 11301 working face in Hongqingliang Coal Mine, the roof deformation and failure law of supporting top coal roadway is analyzed by means of laboratory test, theoretical analysis, numerical simulation and field monitoring. This paper reveals the mechanism of roof bolting cable in soft rock supporting roadway with weak cementation, which provides a theoretical basis for the optimum design of supporting and supporting of supporting coal roadway. The main research contents and conclusions are as follows: (1) through laboratory tests, the mechanical parameters of top coal and overlying mudstone with different depths in 11301 working face are measured, and the mechanical properties of mudstone near and far coal seam are analyzed. Combined with the analysis of rock immersion test, it is found that the roof mudstone of the supporting coal roadway in this working face has typical soft rock characteristics, and it is found that the middle and lower strata of the roof mudstone of the supporting top coal roadway appear in the middle and lower part of the top coal roadway in the working surface of Yushi 11301 working face by television detection of roof drilling. Mudstone is obviously stratified. (2) by constructing the structural mechanical model of supporting top coal roadway, the expression of bending moment of top coal under horizontal stress is given, which weakens the effect of vertical stress on top coal. The results show that the roof coal of soft rock supporting roadway can promote the stability of roof. (3) according to the analysis of the stress state of roof coal strata, Through theoretical analysis, the ratio of elastic modulus of coal beam to rock beam is used as the basis of whether the mudstone of top coal and near coal seam is separated or not, and the expression of maximum tensile stress of top coal and mudstone near coal seam under the action of bending moment of top coal is obtained. (4) numerical simulation study shows that the safe and stable roof of roadway can be promoted by adjusting the thickness of roof seam. The suitable thickness of top coal is 1.5-1.75 m. The occurrence of top coal is stable, and the top coal can promote the stability of roadway roof. A "shallow reinforcement beam" support model suitable for roof bolting design of soft rock supporting roadway with weak cemented soft rock is proposed. (5) based on the research and analysis of "shallow strengthened beam" support model, The main function of roof bolt in soft rock supporting roadway is to anchor the top coal and mudstone near coal seam, which makes it become a reinforced beam, increases the elastic modulus of anchor body, increases the strength of anchor body, and provides a stable foundation for anchor cable support. According to the model analysis, the supporting scheme of 11301 working face is optimized, and good results are obtained in the field application.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD353

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