【摘要】：石拉烏素煤礦煤層大巷斷面大,埋深650m左右,圍巖層狀節(jié)理發(fā)育、整體強度低;頂板為多層軟硬巖互層的復合頂板,且層內(nèi)節(jié)理發(fā)育,引起巷道支護困難。本文以穿煤層段回風大巷為研究對象,采用實驗室實驗、理論分析、數(shù)值模擬及現(xiàn)場實測相結(jié)合的方法,研究了復合巖層大巷圍巖的變形規(guī)律及支護控制技術(shù)。首先,通過巖石取樣,對現(xiàn)場巖樣進行物理力學性能參數(shù)測試,結(jié)果表明巖石整體強度較低,屬于較破碎的軟巖。其次,根據(jù)理論分析,研究復合頂板變形和破壞規(guī)律,以及破碎巖體塊裂結(jié)構(gòu)的穩(wěn)定性條件。并利用FLAC3D數(shù)值模擬軟件,建立多層復合巖層大巷三維計算模型,模擬大巷在不同斷面形狀、跨度和高度以及巖層順序情況下開挖后的變形規(guī)律及支護效果。結(jié)合數(shù)值模擬結(jié)果和現(xiàn)場具體條件,制定了支護方案,并在現(xiàn)場進行支護設(shè)計及工業(yè)性研究。最后,在巷道中布置測站,對最終在現(xiàn)場應(yīng)用的方案進行追蹤監(jiān)測。監(jiān)測結(jié)果表明,支護巷道的圍巖發(fā)生了一定的變形,但整體上得到了有效的控制。本文研究方法和研究成果為石拉烏素煤礦多層復合巖層大巷變形及支護提供了理論支持及技術(shù)保障,為類似巷道圍巖控制提供了科學依據(jù)和使用技術(shù)手段。
[Abstract]:The section of coal seam roadway in Shirawusu Coal Mine is large, the buried depth is about 650 m, the surrounding rock joint is developed, and the overall strength is low. The roof is a composite roof with multi-layer soft and hard rock interbedded layer, and the intra-layer joint is developed, which leads to the difficulty of roadway support. In this paper, taking the return air roadway through coal seam as the research object, the deformation law and support control technology of surrounding rock of composite strata roadway are studied by means of laboratory experiment, theoretical analysis, numerical simulation and field measurement. Firstly, the physical and mechanical properties of the field rock samples are tested by rock sampling. The results show that the overall strength of the rock is low and belongs to the broken soft rock. Secondly, according to the theoretical analysis, the deformation and failure law of composite roof and the stability conditions of broken rock mass crack structure are studied. By using FLAC3D numerical simulation software, a three-dimensional calculation model of multi-layer composite rock roadway is established to simulate the deformation law and supporting effect of roadway under different section shape, span and height, as well as rock sequence. Combined with the results of numerical simulation and the specific conditions in the field, the support scheme is worked out, and the support design and industrial research are carried out in the field. Finally, the station is arranged in the roadway to track and monitor the scheme which is finally applied in the field. The monitoring results show that the surrounding rock of the supporting roadway has been deformed to a certain extent, but it has been effectively controlled as a whole. The research methods and research results in this paper provide theoretical support and technical support for the deformation and support of multi-layer composite strata in Shirausu Coal Mine, and provide scientific basis and technical means for the control of surrounding rock of similar roadway.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD353

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本文編號：2496620