【摘要】 采用相似模拟实验及地质雷达探测相结合的方法,研究了四川省煤炭产业集团有限责任公司铁山南煤矿急倾斜采煤工作面采动断裂带的分布范围.结果表明,上下采空区采动裂隙没有贯通.应用3D-σ有限元程序,计算了防水煤柱宽度分别为60,70,75和80 m时各特征点的应力大小,在此基础上分析了防水煤柱的稳定性.计算结果表明,当防水煤柱宽度为75 m时,各特征点的强度大于应力,但稳定性系数较小;当防水煤柱宽度为80 m时,其稳定性系数为1.2~1.9.根据试验及模拟结果并结合工程实际,确定防水煤柱宽度为80 m.应用综合方法确定的防水煤柱宽度比经验方法减少30 m.更多还原

【Abstract】 Similarity simulation experiment and geological radar detection were used to analyze mining-induced cracks distribution of the steep working face of Tieshannan Coal Mine,and the results show that the mining-induced cracks of upper and lower goaf don’t penetrate.The 3D-σ finite element program was used to calculate the characteristic points’stresses and the stability of the water barrier which width were 60,70,75 and 80 m respectively,and the results show that the strength of each characteristic point is larger than the stress when the width of water barrier is 75 m,but the stability coefficient is little,and the stability coefficient is from 1.2 to 1.9 when the width is 80 m.According to the experimental and simulation results and considering the engineering practice,the width of the water barrier which is 80 m is determined,and it is narrower 30 m than that retains only using engineering experience method.更多还原