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首页> 外文期刊>Journal of Mines, Metals & Fuels >Study on the overburden rock displacement laws of the CSA (combustion space area) of underground coal gasification under the action of thermal mechanical coupling
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Study on the overburden rock displacement laws of the CSA (combustion space area) of underground coal gasification under the action of thermal mechanical coupling

机译：热力耦合作用下地下煤气化CSA（燃烧空间区域）的覆岩位移规律研究

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摘要

In order to study the displacement laws of overlying strata during the process of underground coal gasification, based on the geologic conditions of the Wulanchabu underground coal gasification experimental area, in this study we first carried out the physical and mechanical property test of the coal seam roof under high temperature, and obtained the specific heat capacity of the coal-rock mass, as well as heat conductivity coefficient, elastic modulus and uniaxial compressive strength. Second, we established the equivalent material physical model, analyzing the displacement law of the overlying strata in the CSA; we also established the fracture mechanics model of the critical layer under the influence of temperature, analyzing the effect of the temperature on the overlying strata fracture, and verified this via field testing. The following conclusions were made: In the range of 100~1000a, with the increase of temperature the specific heat capacity and thermal conductivity showed a downward trend; while in the range of 100~750a, with the increase of the temperature the uniaxial compressive strength showed an obvious increasing trend. During the Wulanchabu coal seam gasification process, the overlying strata displacement laws are similar to those of underground mining, with the feature of first weighting and periodic weighting with the pace length of 42 m; three obvious distribution belts also exist, i.e. caving zone, fissured zone, and bending zone with diversion fissure zone height of 28 m. With the increase of temperature, the breaking span of the key strata of the overlying strata showed an enlarging tendency. This was verified on site, using the borehole detecting method, concluding that the height of the diversion fissure zone was 31.21 m, which coincides with the data obtained from the analog simulation test, thereby proving the rationality of the physical model of similar material.
机译：为了研究地下煤气化过程中上覆岩层的位移规律，基于乌兰察布地下煤气化实验区的地质条件，本研究首先对煤层顶板进行了物理力学试验。在高温下，获得了煤岩体的比热容，导热系数，弹性模量和单轴抗压强度。其次，建立等效材料物理模型，分析了CSA上覆岩层的位移规律。我们还建立了温度影响下关键层的断裂力学模型，分析了温度对上覆地层裂缝的影响，并通过现场测试进行了验证。得出以下结论：在100〜1000a范围内，随着温度的升高，比热容和导热系数呈下降趋势。而在100〜750a范围内，随着温度的升高，单轴抗压强度呈现出明显的增加趋势。乌兰察布煤层气化过程中，上覆地层的位移规律与地下开采相似，其特征是步长为42m的初次加权和周期性加权。还存在三个明显的分布带，即崩落带，裂隙带和弯曲带，其转向裂隙带高度为28 m。随着温度的升高，上覆地层关键地层的破裂跨度呈增大趋势。使用钻孔检测方法在现场进行了验证，得出的结论是分流裂缝带的高度为31.21 m，与模拟模拟测试获得的数据相吻合，从而证明了类似材料物理模型的合理性。

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