China Coal Danshuigou Coal Industry Co., Ltd.
College of Energy and Mining, China University of Mining and Technology ( Beijing )

为了研究特厚煤层开采对工作面底板破坏深度的影响，通过在担水沟煤矿9204工作面底板2个观测钻孔，运用直流电法观测分析工作面回采过程中底板岩体视电阻率的变化特征，结合工作面与测点的空间位置关系，得出采动影响下的底板破坏深度，并将其与未考虑煤厚因素影响的统计公式和理论公式的计算值进行比较分析。结果表明，工作面实测底板破坏深度为17.3 m和18.3 m；实测底板最大破坏深度小于统计公式值7.81%～12.90%，大于理论公式值24.81%。探讨其机理认为，相对于工作面斜长、采深等因素，煤厚因素对底板破坏深度影响较低；且工作面底板下17 m赋存有一厚层隔水砂质泥岩，不易产生导水裂缝，降低了底板导水破坏深度。

In order to study the influence of extra-thick coal seam mining on the failure depth of working face floor, through two observation drilling holes in the floor of No.9204 Face in Danshuigou Mine, the variation characteristics of apparent resistivity of floor rock mass during the mining process of working face were observed and analyzed by direct current electric method. Combined with the spatial position relationship between working face and measuring point, the failure depth of floor under the influence of mining was obtained, and it was compared with the calculated values of statistical formula and theoretical formula without considering the influence of coal thickness. The results showed that the measured floor failure depth of the working face was 17.3 m and 18.3 m ; the maximum failure depth of the measured floor was less than the statistical formula value of 7.81 % ~ 12.90 %, which was greater than the theoretical formula value of 24.81 %. Discussing its mechanism, it was considered that the coal thickness factor had less influence on the failure depth of the floor than the factors such as the inclined length of the working face and the mining depth. In addition, there was a thick layer of water-resisting sandy mudstone 17 m below the floor of the working face, which was not easy to produce water conduction cracks and reduces the depth of water conduction damage of the floor.

毛怀勇1，韩 磊2，左红飞1，苏 文1，刘科峰2，王应政1，苗 葳2. 担水沟煤矿特厚煤层开采底板导水破坏带深度实测研究[J]. 煤炭与化工, 2024, 47(5): 31-37.

Mao Huaiyong1, Han Lei2, Zuo Hongfei1, Su Wen1, Liu Kefeng2, Wang Yingzheng1, Miao Wei2. Study on measuring depth of water conduction failure zone in the floor of extra-thick coal seam mining
in Danshuigou Mine. CCI, 2024, 47(5): 31-37.