發(fā)布時間：2018-07-31 08:51

【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。為了能夠更加準確的預測和防治深部開采中的地質災害事故,為設計合理的開采計劃提供更加科學的依據,對高地溫、大地壓耦合作用下深部巷道的應力分布規(guī)律和圍巖變形特性進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)律和熱應力分布規(guī)律,對深部開采中巷道圍巖的地應力分布和熱力耦合行為進行了數(shù)值模擬并進行分析對比,得到了深部巷道圍巖熱力耦合作用下的應力分布和變性特征。并對陶二煤礦-711m水平北運輸大巷進行巷道變形監(jiān)測,得到巷道開挖支護后25天的巷道變形規(guī)律。 通過模擬計算得到如下結論： (1)在原巖溫度為37。C時地熱在巷道周邊產生約6-7MPa的熱應力,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,隨著巷道壁溫度的上升,巷道圍巖應力增大,巷道圍巖徑向位移增大,側壁圍巖水平位移減小。 (2)巷道熱力耦合作用計算得到的圍巖應力比不考慮耦合作用時最大增大約2Mpa,最大增加量約15%,圍巖應力變化最大區(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力場和位移場在徑向深度為0-8m的范圍內影響比較顯著；在徑向深度8-14m范圍內,影響較小,當徑向深度大于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水平北運輸大巷開挖支護后25天變形進行監(jiān)測,得到在支護的情況下,巷道頂板變形較小,相比底板變形比較嚴重,底板變形量最大達到77mm,產生嚴重的底鼓現(xiàn)象,最大變形速度可以達到4.2mm/d,嚴重影響了礦山的生產和安全。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,論文希望在加強理論研究的同時,改進實驗配備,能夠用實驗結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.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD727

【參考文獻】

相關期刊論文 前10條

1 張玉軍;;不同場熱—水—應力耦合過程二維有限元分析[J];地下空間與工程學報;2007年03期

2 張曉敏;彭向和;;熱力耦合問題的本構方程[J];重慶大學學報(自然科學版);2006年06期

3 周西華,單亞飛,王繼仁;井巷圍巖與風流的不穩(wěn)定換熱[J];遼寧工程技術大學學報(自然科學版);2002年03期

4 閻龍海;于麗艷;劉寶良;;深部礦井圍巖應力變形的ANSYS數(shù)值模擬[J];黑龍江科技學院學報;2007年01期

5 韋四江,勾攀峰,馬建宏;深井巷道圍巖應力場、應變場和溫度場耦合作用研究[J];河南理工大學學報(自然科學版);2005年05期

6 徐小麗;高峰;沈曉明;;巖石熱力損傷破壞的能量準則研究[J];金屬礦山;2011年03期

7 張彬;劉波;;ANSYS在軟巖巷道圍巖穩(wěn)定性分析中的應用[J];山西建筑;2009年30期

8 何滿潮，，彭濤;高應力軟巖的工程地質特征及變形力學機制[J];礦山壓力與頂板管理;1995年02期

9 鐘敏,余偉健,明世祥;松軟巖土巷道塑性破壞效應分析[J];礦業(yè)研究與開發(fā);2005年04期

10 占豐林;蔡美峰;;地溫梯度對地下礦山地應力計算的影響[J];礦業(yè)研究與開發(fā);2006年03期

相關博士學位論文 前2條

1 王猛;煤礦深部開采巷道圍巖變形破壞特征試驗研究及其控制技術[D];遼寧工程技術大學;2010年

2 陳紅江;裂隙巖體應力—損傷—滲流耦合理論、試驗及工程應用研究[D];中南大學;2010年

相關碩士學位論文 前3條

1 盧萍;熱—流—固耦合條件下軟巖巷道壓力與變形的研究[D];遼寧工程技術大學;2009年

2 黎明鏡;熱力耦合作用下深井巷道圍巖變形規(guī)律研究[D];安徽理工大學;2010年

3 李志健;大強煤礦熱害區(qū)巷道圍巖溫度場的多場耦合模擬分析[D];遼寧工程技術大學;2011年

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