本文選題：深部 + 軟巖�。� 參考：《太原理工大學》2015年碩士論文

【摘要】：煤礦進入深部開采后，在復雜地應力場的影響下，深部巖體呈現(xiàn)出非線性力學行為，深井巷道圍巖的大變形及穩(wěn)定性控制問題越來越突出[1]。而針對深部緩傾斜軟巖巷道非對稱變形破壞，其支護形式通常采用對稱支護，由于支護體力學特性與圍巖力學特性的不耦合，圍巖首先在關鍵薄弱部位發(fā)生破壞，進而導致整個巷道的失穩(wěn)。若提高全斷面支護強度，滿足周邊高應力破壞嚴重部位的支護強度，而對破壞變形較小的部位采用同等的支護強度會造成支護成本的增加，材料的浪費等問題。因此充分掌握深部緩傾斜軟巖巷道非對稱變形機理，確定其支護關鍵部位，，提出有效的支護對策是非常必要的。 本文以新安煤礦+535回風石門為研究背景，通過現(xiàn)場工程地質調查、理論分析、數(shù)值模擬以及現(xiàn)場工業(yè)性試驗相結合的方法分析了深部緩傾斜軟巖巷道非對稱變形的機理，研究了水平應力的方向、大小及圍巖產(chǎn)狀對深部緩傾斜軟巖巷道非對稱變形的影響作用。在此基礎上提出了“關鍵部位加強支護”的非對稱耦合支護對策，并在新安煤礦進行了工業(yè)性試驗研究。主要結論如下： （1）通過現(xiàn)場觀測及數(shù)值模擬分析表明，深部緩傾斜軟巖巷道呈現(xiàn)出非對稱變形特征為底臌偏向高幫，頂板下沉量偏向頂板左側（低幫）、高幫位移量大于低幫的特征。 （2）在不考慮巖層傾角對軟巖巷道非對稱變形影響下，采用數(shù)值模擬軟件FLAC3D對最大水平主應力方向與巷道軸向夾角(0°、15°、30°、45°、60、°90°)對巷道非對稱變形的影響進行了分析。 （3）在不考慮最大水平主應力方向與巷道軸向夾角對巷道非對稱變形的影響下，對不同側壓系數(shù)下緩傾斜軟巖巷道非對稱變形特征進行了數(shù)值模擬研究，分析了其對非對稱變形的影響作用。 （4）基于FLAC3D內(nèi)置的cvsic黏彈塑性本構模型對深部緩傾斜軟巖巷道圍巖破壞過程進行了數(shù)值模擬分析，結合現(xiàn)場觀測，將該類巷道的變形特征總結為：巷道圍巖整體來壓→底板非對稱底臌→右?guī)椭邢虏績?nèi)擠變形→左幫中上部變形→頂板左側破壞→不對稱變形擴大→巷道整體失穩(wěn)。 （5）通過對緩斜軟巖巷道巖層產(chǎn)狀、應力場及數(shù)值模擬研究結果分析，確定了新安煤礦+535回風石門巷道非對稱變形破壞的關鍵部位為巷道低幫肩角、高幫部位及高幫底角。 （6）采用“關鍵部位加強支護”的非對稱耦合支護對策對新安煤礦+535回風石門巷道進行了工業(yè)性試驗研究，通過現(xiàn)場觀測表明該技術能夠有效地控制該類巷道的變形。
[Abstract]:Under the influence of complex ground stress field, the deep rock mass presents nonlinear mechanical behavior after the coal mine enters into deep mining. The problems of large deformation and stability control of surrounding rock in deep roadway are more and more prominent [1]. In view of asymmetric deformation and failure of soft rock roadway with gently inclined depth, symmetrical support is usually used in the support form. Because of the uncoupling between the mechanical properties of support and surrounding rock, the surrounding rock is destroyed in the key position at first. This will lead to the instability of the whole roadway. If the full section support strength is improved to satisfy the support strength of the serious site with high stress around it, the same support strength will cause the increase of the support cost and the waste of the material. Therefore, it is very necessary to fully understand the asymmetric deformation mechanism of soft rock roadway in depth, determine the key parts of support, and put forward effective supporting countermeasures. In this paper, the mechanism of asymmetric deformation of deep gently inclined soft rock roadway is analyzed by means of field engineering geological investigation, theoretical analysis, numerical simulation and field industrial test. The effect of horizontal stress direction, size and occurrence of surrounding rock on asymmetric deformation of soft rock roadway with gently inclined depth is studied. On the basis of this, the asymmetric coupling support countermeasures of "strengthening support in key parts" are put forward, and industrial test research is carried out in Xinan Coal Mine. The main conclusions are as follows: 1) through field observation and numerical simulation analysis, it is shown that the deep soft rock roadway is characterized by asymmetrical deformation of floor heave and roof subsidence to the left side of roof (low slope, high slope displacement is larger than low slope). 2) without considering the influence of rock dip angle on the asymmetric deformation of soft rock roadway, the influence of maximum horizontal principal stress direction and the axial angle of roadway on the asymmetric deformation of roadway is analyzed by using the numerical simulation software FLAC3D (0 擄/ 15 擄/ 30 擄/ 45 擄/ 60, 擄90 擄). 3) without considering the influence of maximum horizontal principal stress direction and the axial angle of roadway on the asymmetric deformation of roadway, the characteristics of asymmetric deformation of gently inclined soft rock roadway under different lateral pressure coefficients are numerically simulated. Its effect on asymmetric deformation is analyzed. (4) based on the cvsic viscoelastic-plastic constitutive model built in by FLAC3D, the failure process of surrounding rock in soft rock roadway with gently inclined depth is simulated and analyzed, combined with field observation. The deformation characteristics of this kind of roadway are summarized as follows: the whole surrounding rock of the roadway is compressed with asymmetric floor heave and the middle and lower part of the right side is extruded and the middle and upper part of the left side is deformed and the left side of the roof is destroyed. Based on the analysis of rock formation, stress field and numerical simulation results of soft rock roadway with gentle slope, it is determined that the key site of asymmetric deformation and failure of 535 return wind Shimen roadway in Xinan Coal Mine is low shoulder angle, high top position and high bottom angle of roadway. In this paper, the asymmetric coupling support countermeasure of "strengthening support in key position" is used to study the industrial test of 535 return air Shimen roadway in Xinan Coal Mine. The field observation shows that the technique can effectively control the deformation of this kind of roadway.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD353

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