【摘要】：深部開采過程中,巷道圍巖溫度隨著開采深度的增加不斷升高。為了能夠更加準(zhǔn)確的預(yù)測和防治深部開采中的地質(zhì)災(zāi)害事故,為設(shè)計(jì)合理的開采計(jì)劃提供更加科學(xué)的依據(jù),對高地溫、大地壓耦合作用下深部巷道的應(yīng)力分布規(guī)律和圍巖變形特性進(jìn)行深入研究是非常有必要的。 本論文采用有限元軟件ANSYS模擬計(jì)算了不同巷道壁溫度下深部巷道圍巖溫度場的分布規(guī)律和熱應(yīng)力分布規(guī)律,對深部開采中巷道圍巖的地應(yīng)力分布和熱力耦合行為進(jìn)行了數(shù)值模擬并進(jìn)行分析對比,得到了深部巷道圍巖熱力耦合作用下的應(yīng)力分布和變性特征。并對陶二煤礦-711m水平北運(yùn)輸大巷進(jìn)行巷道變形監(jiān)測,得到巷道開挖支護(hù)后25天的巷道變形規(guī)律。 通過模擬計(jì)算得到如下結(jié)論： (1)在原巖溫度為37。C時(shí)地?zé)嵩谙锏乐苓叜a(chǎn)生約6-7MPa的熱應(yīng)力,并且在巷道兩幫的影響深度約為5.8m左右,巷道頂部和底部影響深度約為4.6m左右。在開采深度為-711m,原巖溫度為37。C時(shí),隨著巷道壁溫度的上升,巷道圍巖應(yīng)力增大,巷道圍巖徑向位移增大,側(cè)壁圍巖水平位移減小。 (2)巷道熱力耦合作用計(jì)算得到的圍巖應(yīng)力比不考慮耦合作用時(shí)最大增大約2Mpa,最大增加量約15%,圍巖應(yīng)力變化最大區(qū)域位于徑向深度約為1.8m處。熱力耦合作用對巷道圍巖應(yīng)力場和位移場在徑向深度為0-8m的范圍內(nèi)影響比較顯著；在徑向深度8-14m范圍內(nèi),影響較小,當(dāng)徑向深度大于14m,可視為沒有影響,巷道圍巖變形量最大增加約10.5%左右。 (3)通過對陶二煤礦-711m水平北運(yùn)輸大巷開挖支護(hù)后25天變形進(jìn)行監(jiān)測,得到在支護(hù)的情況下,巷道頂板變形較小,相比底板變形比較嚴(yán)重,底板變形量最大達(dá)到77mm,產(chǎn)生嚴(yán)重的底鼓現(xiàn)象,最大變形速度可以達(dá)到4.2mm/d,嚴(yán)重影響了礦山的生產(chǎn)和安全。巷道平均底鼓量與頂板下沉量比值約為2.77：1；兩幫位移量與頂板下沉量比值約為2.14：1。 最后,論文希望在加強(qiáng)理論研究的同時(shí),改進(jìn)實(shí)驗(yàn)配備,能夠用實(shí)驗(yàn)結(jié)果來為理論研究作有力的支撐。
[Abstract]:In the process of deep mining, the surrounding rock temperature of roadway increases with the increase of mining depth. In order to more accurately predict and prevent geological disasters and accidents in deep mining, and to provide a more scientific basis for the design of rational mining plans, and to provide a more scientific basis for high ground temperature, It is necessary to study the stress distribution law and surrounding rock deformation characteristics of deep roadway under the coupling of geodetic pressure. In this paper, the distribution law of surrounding rock temperature field and thermal stress distribution of deep roadway under different wall temperature of roadway are simulated by finite element software ANSYS. In this paper, the in-situ stress distribution and thermo-mechanical coupling behavior of roadway surrounding rock in deep mining are numerically simulated and compared, and the stress distribution and denaturation characteristics of deep roadway surrounding rock under thermal coupling are obtained. The deformation of roadway at -711m level in Taoer coal mine is monitored, and the deformation law of roadway after 25 days of excavation and support is obtained. The results are as follows: (1) when the original rock temperature is 37.C, the geothermal stress around the roadway is about 6-7MPa, and the influence depth of the two sides of the roadway is about 5.8 m. The influence depth of the top and bottom of roadway is about 4.6 m. When the mining depth is -711m and the original rock temperature is 37.C, with the increase of the wall temperature, the surrounding rock stress increases and the radial displacement increases. The lateral wall rock horizontal displacement decreases. (2) the maximum increase of surrounding rock stress ratio is about 2 Mpa. the maximum increase amount is about 15 and the maximum area of surrounding rock stress change is located in diameter when the coupling effect of roadway is not considered. The depth is about 1.8 m. The influence of thermal coupling on stress field and displacement field of roadway surrounding rock is obvious in the range of 0-8 m in radial depth, and less in the range of 8-14 m in radial depth. When the radial depth is more than 14 m, it can be regarded as having no effect on the stress field and displacement field of roadway surrounding rock. The deformation of roadway surrounding rock is increased by about 10.5%. (3) the deformation of roadway roof is small under the condition of supporting, by monitoring the deformation of roadway after excavation and support at -711m level in Tao-er Coal Mine. Compared with the bottom plate, the deformation of the bottom plate is more serious, the maximum deformation of the bottom plate is 77 mm, and the maximum deformation velocity can reach 4.2 mm / d, which seriously affects the production and safety of the mine. The ratio of average floor heave to roof subsidence is about 2.77: 1, and the ratio of displacement to roof subsidence is about 2.14: 1. Finally, the paper hopes to strengthen the theoretical research, improve the experimental equipment, can use the experimental results to provide a strong support for the theoretical research.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TD727

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