厚煤层残煤复采长壁工作面煤岩稳定性研究
发布时间：2018-11-12 13:22
【摘要】：由于新岭煤矿早期采用巷采等落后的采煤工艺,遗留了大量的残煤资源。近年来随着新岭煤矿剩余储量逐渐较少,煤炭产能不断下降,残煤回收成为煤炭生产的主要任务。但由于残煤复采工作面原始煤层遭到破坏,工作面存有大量老巷和煤柱,使得工作面开采条件复杂,面临着老巷对顶板稳定性、矿压显现规律、煤岩稳定性的影响及工作面支护等诸多技术问题需要解决。本文以新岭煤矿残煤复采工作面地质条件为基础,采用理论分析、相似模拟、数值模拟及现场实测等方法对残采工作面的支柱工作阻力及工作面煤岩的稳定性进行了分析。通过理论计算得出了支柱的合理支护阻力及煤柱的失效宽度;通过相似模拟实验研究了工作面前方有老巷时的煤岩体破坏规律及矿压显现规律;通过udec数值模拟软件分析了不同的采放比及不同的老巷间距对残采工作面矿压显现和煤岩稳定性的影响;通过现场实测,研究分析了工作面超前支承压力的分布规律、顶煤的运移规律及单体液压支柱的适应性。研究分析得出工作面合理的支护阻力为552k N/m2,煤柱的失效宽度为1.92m;老巷造成工作面片帮冒顶严重;工作面采放比采用1:2时,可以有效减弱工作面的矿压显现,有利于提高煤岩的稳定性;工作面在不同的老巷间距下煤岩体有不同的破坏特征;现场实测总得出超前支承应力影响范围约为30m,峰值约3.13MPa,工作面上方的冒空是导致支柱工作阻力偏小的主要原因。
[Abstract]:Because of the backward mining technology such as roadway mining in early stage, Xinling coal mine left a large amount of residual coal resources. In recent years, as the remaining reserves of Xinling Coal Mine are gradually less and the coal production capacity is declining, the recovery of residual coal has become the main task of coal production. However, due to the destruction of the original coal seam and the existence of a large number of old roadways and pillars in the working face, the mining conditions of the working face are complicated, and it is faced with the stability of the old roadway to the roof and the regularity of the rock pressure appearance. The influence of the stability of coal and rock and the support of working face and many other technical problems need to be solved. Based on the geological conditions of the residual coal mining face in Xinling Coal Mine, this paper analyzes the working resistance of the pillar and the stability of the coal and rock in the residual mining face by means of theoretical analysis, similarity simulation, numerical simulation and field measurement. The reasonable support resistance and the failure width of coal pillar are obtained by theoretical calculation, and the failure law of coal and rock mass and the law of rock pressure are studied by similar simulation experiment. Through udec numerical simulation software, the influence of different mining / drawing ratio and different old roadway spacing on mine pressure behavior and coal rock stability of residual mining face is analyzed. Through the field measurement, the distribution law of the leading support pressure, the movement law of the top coal and the adaptability of the single hydraulic prop are studied and analyzed. The reasonable support resistance is 552 K N / m 2 and the failure width of coal pillar is 1.92 m. When the mining caving ratio is adopted at 1:2, it can effectively weaken the appearance of coal pressure in the working face, which is helpful to improve the stability of coal and rock, and the coal and rock mass have different failure characteristics under different old roadway spacing. The results show that the influence range of the leading support stress is about 30 m and the peak value is about 3.13 MPA. The caving above the working face is the main reason leading to the low working resistance of the pillar.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.253
本文编号：2327242
[Abstract]:Because of the backward mining technology such as roadway mining in early stage, Xinling coal mine left a large amount of residual coal resources. In recent years, as the remaining reserves of Xinling Coal Mine are gradually less and the coal production capacity is declining, the recovery of residual coal has become the main task of coal production. However, due to the destruction of the original coal seam and the existence of a large number of old roadways and pillars in the working face, the mining conditions of the working face are complicated, and it is faced with the stability of the old roadway to the roof and the regularity of the rock pressure appearance. The influence of the stability of coal and rock and the support of working face and many other technical problems need to be solved. Based on the geological conditions of the residual coal mining face in Xinling Coal Mine, this paper analyzes the working resistance of the pillar and the stability of the coal and rock in the residual mining face by means of theoretical analysis, similarity simulation, numerical simulation and field measurement. The reasonable support resistance and the failure width of coal pillar are obtained by theoretical calculation, and the failure law of coal and rock mass and the law of rock pressure are studied by similar simulation experiment. Through udec numerical simulation software, the influence of different mining / drawing ratio and different old roadway spacing on mine pressure behavior and coal rock stability of residual mining face is analyzed. Through the field measurement, the distribution law of the leading support pressure, the movement law of the top coal and the adaptability of the single hydraulic prop are studied and analyzed. The reasonable support resistance is 552 K N / m 2 and the failure width of coal pillar is 1.92 m. When the mining caving ratio is adopted at 1:2, it can effectively weaken the appearance of coal pressure in the working face, which is helpful to improve the stability of coal and rock, and the coal and rock mass have different failure characteristics under different old roadway spacing. The results show that the influence range of the leading support stress is about 30 m and the peak value is about 3.13 MPA. The caving above the working face is the main reason leading to the low working resistance of the pillar.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.253
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