本文選題：深部 + 軟巖��； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：煤礦進(jìn)入深部開(kāi)采后，在復(fù)雜地應(yīng)力場(chǎng)的影響下，深部巖體呈現(xiàn)出非線性力學(xué)行為，深井巷道圍巖的大變形及穩(wěn)定性控制問(wèn)題越來(lái)越突出[1]。而針對(duì)深部緩傾斜軟巖巷道非對(duì)稱(chēng)變形破壞，其支護(hù)形式通常采用對(duì)稱(chēng)支護(hù)，由于支護(hù)體力學(xué)特性與圍巖力學(xué)特性的不耦合，圍巖首先在關(guān)鍵薄弱部位發(fā)生破壞，進(jìn)而導(dǎo)致整個(gè)巷道的失穩(wěn)。若提高全斷面支護(hù)強(qiáng)度，滿足周邊高應(yīng)力破壞嚴(yán)重部位的支護(hù)強(qiáng)度，而對(duì)破壞變形較小的部位采用同等的支護(hù)強(qiáng)度會(huì)造成支護(hù)成本的增加，材料的浪費(fèi)等問(wèn)題。因此充分掌握深部緩傾斜軟巖巷道非對(duì)稱(chēng)變形機(jī)理，確定其支護(hù)關(guān)鍵部位，，提出有效的支護(hù)對(duì)策是非常必要的。 本文以新安煤礦+535回風(fēng)石門(mén)為研究背景，通過(guò)現(xiàn)場(chǎng)工程地質(zhì)調(diào)查、理論分析、數(shù)值模擬以及現(xiàn)場(chǎng)工業(yè)性試驗(yàn)相結(jié)合的方法分析了深部緩傾斜軟巖巷道非對(duì)稱(chēng)變形的機(jī)理，研究了水平應(yīng)力的方向、大小及圍巖產(chǎn)狀對(duì)深部緩傾斜軟巖巷道非對(duì)稱(chēng)變形的影響作用。在此基礎(chǔ)上提出了“關(guān)鍵部位加強(qiáng)支護(hù)”的非對(duì)稱(chēng)耦合支護(hù)對(duì)策，并在新安煤礦進(jìn)行了工業(yè)性試驗(yàn)研究。主要結(jié)論如下： （1）通過(guò)現(xiàn)場(chǎng)觀測(cè)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(duì)稱(chēng)變形特征為底臌偏向高幫，頂板下沉量偏向頂板左側(cè)（低幫）、高幫位移量大于低幫的特征。 （2）在不考慮巖層傾角對(duì)軟巖巷道非對(duì)稱(chēng)變形影響下，采用數(shù)值模擬軟件FLAC3D對(duì)最大水平主應(yīng)力方向與巷道軸向夾角(0°、15°、30°、45°、60、°90°)對(duì)巷道非對(duì)稱(chēng)變形的影響進(jìn)行了分析。 （3）在不考慮最大水平主應(yīng)力方向與巷道軸向夾角對(duì)巷道非對(duì)稱(chēng)變形的影響下，對(duì)不同側(cè)壓系數(shù)下緩傾斜軟巖巷道非對(duì)稱(chēng)變形特征進(jìn)行了數(shù)值模擬研究，分析了其對(duì)非對(duì)稱(chēng)變形的影響作用。 （4）基于FLAC3D內(nèi)置的cvsic黏彈塑性本構(gòu)模型對(duì)深部緩傾斜軟巖巷道圍巖破壞過(guò)程進(jìn)行了數(shù)值模擬分析，結(jié)合現(xiàn)場(chǎng)觀測(cè)，將該類(lèi)巷道的變形特征總結(jié)為：巷道圍巖整體來(lái)壓→底板非對(duì)稱(chēng)底臌→右?guī)椭邢虏績(jī)?nèi)擠變形→左幫中上部變形→頂板左側(cè)破壞→不對(duì)稱(chēng)變形擴(kuò)大→巷道整體失穩(wěn)。 （5）通過(guò)對(duì)緩斜軟巖巷道巖層產(chǎn)狀、應(yīng)力場(chǎng)及數(shù)值模擬研究結(jié)果分析，確定了新安煤礦+535回風(fēng)石門(mén)巷道非對(duì)稱(chēng)變形破壞的關(guān)鍵部位為巷道低幫肩角、高幫部位及高幫底角。 （6）采用“關(guān)鍵部位加強(qiáng)支護(hù)”的非對(duì)稱(chēng)耦合支護(hù)對(duì)策對(duì)新安煤礦+535回風(fēng)石門(mén)巷道進(jìn)行了工業(yè)性試驗(yàn)研究，通過(guò)現(xiàn)場(chǎng)觀測(cè)表明該技術(shù)能夠有效地控制該類(lèi)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(xué)位授予單位】：太原理工大學(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)：1939149