【摘要】：畢節(jié)市煤炭資源豐富,以往煤炭開采小型煤礦居多,開采工藝為炮采和普采,回采巷道斷面小。近幾年隨著煤礦兼并重組的推進,煤礦生產(chǎn)規(guī)模不斷擴大,綜合機械化開采要求更大的巷道斷面�，F(xiàn)有煤礦對大斷面巷道認識不充分,技術(shù)經(jīng)驗欠缺,加之一些特殊的圍巖條件,導致巷道維護困難。因此,針對畢節(jié)市煤礦實際地質(zhì)條件開展大斷面軟巖巷道支護技術(shù)研究具有重要的理論價值和實際意義。本文以畢節(jié)市紅林煤礦39110工作面運巷為工程背景,綜合采用現(xiàn)場調(diào)研勘察、理論分析、數(shù)值模擬以及現(xiàn)場試驗等方法,對大斷面軟巖巷道圍巖變形破壞機理和特征以及支護技術(shù)做了系統(tǒng)的研究。論文闡述了巷道圍巖變形破壞機理,分析影響大斷面軟巖巷道變形破壞的影響因素主要為巷道圍巖巖性、巷道斷面尺寸及形狀和支護方式及參數(shù)。在此基礎(chǔ)上,采用數(shù)值模擬詳細研究分析了巷道斷面尺寸對圍巖應(yīng)力、位移和塑性區(qū)分布的影響,揭示了大斷面軟巖巷道圍巖變形具有來壓快、變形速度快、變形量大和具有時間效應(yīng)的特征。研究提出了針對大斷面軟巖巷道的錨網(wǎng)索耦合支護技術(shù),并研究分析了不同的支護參數(shù)下,即錨桿間距、排距、長度、錨索數(shù)量變化的情況下圍巖變形規(guī)律,最終確定了合理的錨網(wǎng)索支護參數(shù)。論文最后在紅林煤礦39110工作面運巷進行了工業(yè)性試驗,進行了一系列礦壓觀測分析,對巷道圍巖變形量以及錨桿、錨索載荷的分析結(jié)果表明,巷道采用錨網(wǎng)索耦合支護方式及設(shè)計的支護參數(shù)下,巷道圍巖變形量小,并逐漸穩(wěn)定,巷道圍巖控制效果顯著。
[Abstract]:Bijie City is rich in coal resources. In the past, most of the small coal mines were small coal mines, the mining technology was blasting mining and general mining, and the section of mining roadway was small. In recent years, with the promotion of coal mine merger and reorganization, the scale of coal mine production continues to expand, and comprehensive mechanized mining requires a larger roadway section. The existing coal mine is not fully aware of large section roadway, lack of technical experience, coupled with some special surrounding rock conditions, which leads to the difficulty of roadway maintenance. Therefore, it is of great theoretical value and practical significance to study the supporting technology of large section soft rock roadway according to the actual geological conditions of Bijie Coal Mine. Based on the engineering background of roadway transportation in 39110 working face of Honglin Coal Mine in Bijie City, this paper makes a systematic study on the deformation and failure mechanism and characteristics of surrounding rock and supporting technology of large section soft rock roadway by means of field investigation, theoretical analysis, numerical simulation and field test. This paper expounds the deformation and failure mechanism of roadway surrounding rock, and analyzes the main influencing factors of deformation and failure of large section soft rock roadway are the lithology of roadway surrounding rock, the size and shape of roadway section, the supporting mode and parameters. On this basis, the influence of roadway section size on the stress, displacement and plastic zone distribution of surrounding rock is studied and analyzed in detail by numerical simulation, and it is revealed that the deformation of surrounding rock of large section soft rock roadway has the characteristics of fast incoming pressure, fast deformation speed, large deformation and time effect. The coupling supporting technology of anchor mesh and cable for large section soft rock roadway is studied and put forward, and the deformation law of surrounding rock under different supporting parameters, that is, bolt spacing, row distance, length and the number of anchor cables, is studied and analyzed, and the reasonable supporting parameters of anchor mesh cable are finally determined. Finally, the industrial test of roadway transportation in 39110 working face of Honglin Coal Mine is carried out, and a series of mine pressure observation and analysis are carried out. the results show that the deformation of surrounding rock of roadway is small and gradually stable under the coupling support mode of anchor, mesh and cable and the designed support parameters, and the control effect of surrounding rock of roadway is remarkable.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD353

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