本文選題：色連二礦　切入點(diǎn)：軟巖　出處：《安徽理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著煤炭開(kāi)采不斷向深部發(fā)展,軟巖的工程地質(zhì)問(wèn)題一直困擾著我國(guó)西部煤礦的安全生產(chǎn),特別是西部中生代盆地的膠結(jié)差、低膨脹性、遇水泥化這類(lèi)軟巖,礦山巷道在掘進(jìn)過(guò)程中的穩(wěn)定性評(píng)價(jià)尚缺乏可靠依據(jù)。因此,對(duì)研究區(qū)軟巖巷道圍巖穩(wěn)定性進(jìn)行分析及評(píng)價(jià),從而為深部支護(hù)設(shè)計(jì)與資源的合理開(kāi)采提供科學(xué)參考具有重要的實(shí)踐意義。 本文在分析色連二礦水文工程地質(zhì)條件、巖石物理力學(xué)特性及圍巖性質(zhì)和微觀(guān)組分的基礎(chǔ)上,結(jié)合井筒以及巷道工程地質(zhì)的實(shí)際調(diào)查,明晰了巷道變形失穩(wěn)特征及影響軟巖巷道圍巖穩(wěn)定性的主控因素：即由于礦區(qū)軟巖成巖時(shí)代晚、巖石成熟度低、軟巖中含有大量的粘土礦物等親水性物質(zhì),以致巖石在遇水條件下軟化甚至泥化,使得圍巖的強(qiáng)度急劇弱化,從而導(dǎo)致圍巖的變形失穩(wěn)破壞。并分別運(yùn)用集對(duì)理論、BP神經(jīng)網(wǎng)絡(luò)和灰色關(guān)聯(lián)度等方法對(duì)礦區(qū)3條典型的軟巖巷道進(jìn)行了圍巖穩(wěn)定性評(píng)價(jià),結(jié)果表明：礦區(qū)軟巖巷道在遇水軟化前,屬于基本穩(wěn)定型。 在此基礎(chǔ)上,運(yùn)用FLAC3D軟件,模擬對(duì)比分析了滲流與無(wú)滲流、軟化與未軟化、支護(hù)與未支護(hù)等方案下軟巖巷道開(kāi)挖后圍巖應(yīng)力、塑性區(qū)、位移等變化特征,各數(shù)值模擬方案對(duì)比分析表明：軟巖巷道在滲流條件下和遇水軟化后都不同程度的加劇了圍巖的塑性破壞,但水對(duì)圍巖穩(wěn)定性的主要影響因素是對(duì)軟巖的力學(xué)弱化作用,且支護(hù)有效的控制了軟化滲流導(dǎo)致的圍巖破壞。研究結(jié)果對(duì)指導(dǎo)含水層下軟巖巷道的掘進(jìn)和支護(hù)設(shè)計(jì)提供了一定的科學(xué)依據(jù),有一定的借鑒意義。
[Abstract]:With the continuous development of coal mining to the deep, the engineering geological problems of soft rock have been perplexing the safe production of coal mines in western China, especially the poor cementation, low expansion and cement of the Mesozoic basins in the western China. The stability evaluation of mine roadway in the process of excavation is still lack of reliable basis. Therefore, the stability of surrounding rock of soft rock roadway in the study area is analyzed and evaluated. Therefore, it is of great practical significance to provide scientific reference for deep support design and rational exploitation of resources. Based on the analysis of hydrological engineering geological conditions, physical and mechanical characteristics of rock and surrounding rock properties and microscopic composition of Xilian No.2 Mine, this paper combines with the actual investigation of the engineering geology of shaft and roadway. The characteristics of roadway deformation and instability and the main controlling factors affecting the stability of soft rock roadway surrounding rock are clarified: that is, due to the late diagenetic age of soft rock in mining area, the low maturity of rock, the soft rock contains a large amount of hydrophilic substances such as clay minerals. As a result, the rock softens or even muddies under the condition of water, which weakens the strength of the surrounding rock. The method of set pair theory BP neural network and grey correlation degree are used to evaluate the stability of surrounding rock in three typical soft rock roadways in mining area. The results show that the soft rock roadway in mining area belongs to the basic stable type before softening in water. On this basis, by using FLAC3D software, the variation characteristics of surrounding rock stress, plastic zone and displacement of soft rock roadway after excavation are simulated and analyzed, such as seepage and no seepage, softening and unsoftening, supporting and unsupporting, etc. The comparative analysis of various numerical simulation schemes shows that the plastic failure of surrounding rock is aggravated to varying degrees in soft rock roadway under seepage condition and after water softening, but the main influence factor of water on the stability of surrounding rock is the mechanical weakening of soft rock. And the support can effectively control the surrounding rock damage caused by soft seepage. The research results provide a certain scientific basis for guiding the excavation and support design of soft rock roadway under the aquifer, which has certain reference significance.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD353

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本文編號(hào)：1560417