陶二煤矿深部开采热力耦合行为研究
发布时间：2018-07-31 08:51
【摘要】：深部开采过程中,巷道围岩温度随着开采深度的增加不断升高。为了能够更加准确的预测和防治深部开采中的地质灾害事故,为设计合理的开采计划提供更加科学的依据,对高地温、大地压耦合作用下深部巷道的应力分布规律和围岩变形特性进行深入研究是非常有必要的。 本论文采用有限元软件ANSYS模拟计算了不同巷道壁温度下深部巷道围岩温度场的分布规律和热应力分布规律,对深部开采中巷道围岩的地应力分布和热力耦合行为进行了数值模拟并进行分析对比,得到了深部巷道围岩热力耦合作用下的应力分布和变性特征。并对陶二煤矿-711m水平北运输大巷进行巷道变形监测,得到巷道开挖支护后25天的巷道变形规律。 通过模拟计算得到如下结论： (1)在原岩温度为37。C时地热在巷道周边产生约6-7MPa的热应力,并且在巷道两帮的影响深度约为5.8m左右,巷道顶部和底部影响深度约为4.6m左右。在开采深度为-711m,原岩温度为37。C时,随着巷道壁温度的上升,巷道围岩应力增大,巷道围岩径向位移增大,侧壁围岩水平位移减小。 (2)巷道热力耦合作用计算得到的围岩应力比不考虑耦合作用时最大增大约2Mpa,最大增加量约15%,围岩应力变化最大区域位于径向深度约为1.8m处。热力耦合作用对巷道围岩应力场和位移场在径向深度为0-8m的范围内影响比较显著；在径向深度8-14m范围内,影响较小,当径向深度大于14m,可视为没有影响,巷道围岩变形量最大增加约10.5%左右。 (3)通过对陶二煤矿-711m水平北运输大巷开挖支护后25天变形进行监测,得到在支护的情况下,巷道顶板变形较小,相比底板变形比较严重,底板变形量最大达到77mm,产生严重的底鼓现象,最大变形速度可以达到4.2mm/d,严重影响了矿山的生产和安全。巷道平均底鼓量与顶板下沉量比值约为2.77：1；两帮位移量与顶板下沉量比值约为2.14：1。 最后,论文希望在加强理论研究的同时,改进实验配备,能够用实验结果来为理论研究作有力的支撑。
[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.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD727
本文编号：2155066
[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.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD727
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