Key Laboratory of Geological Safety of Coastal Urban Underground Space,Ministry of Natural Resources
Qingdao University of Technology
Qingdao Geo-Engineering Surveying Institute (Qingdao Geological Exploration Development Bureau)
CCTEG Chongqing Research Institute

为研究火烧区富水情况下煤层开采安全问题,需要准确分析开采覆岩导水裂隙带发育情况。运用有限元ANSYS模拟计算,基于第一强度理论,根据上覆岩层抗拉强度值,选择第一主应力值在1.5MPa时的曲线范围作为导水裂隙带发育高度范围,并运用井下双端堵漏法进行观测验证,较为准确。研究得出导水裂隙发育强度准则可采用第一强度理论,第一主应力值在1.5MPa时,导水裂隙带发育曲线范围在50.17~62.13m,上边界未与火烧区沟通,下边界存在与上覆火烧区沟通现象,即火烧区积水是开采煤层的重大水患;同时在煤层倾斜情况下,导水裂隙带发育高度上边界要大于下边界,因此计算倾斜煤层导水裂隙带发育高度时,要考虑煤层倾角的影响。

In order to study the safety issues of coal seam mining under the condition of abundant water in the burning area, it is necessary to accurately analyze the development of the water conducted zone in the mining overlying rock. By using finite element ANSYS simulation calculation and the first strength theory,based on the tensile strength value of the overlying rock layer,the curve range of the first principal stress value at 1. 5 MPa was selected as the height range of the water conducted zone development, and verified with the observation of the underground double end sealing method, which is more accurate. It is concluded that the first strength theory can be used as the criterion for the development strength of water-conducting cracks. When the first principal stress value is 1. 5 MPa, the development curve of the water conduced zone ranges from 50. 17 m to 62. 13 m. The upper boundary is not communicated with the Mining Safety & Environmental burning area,while the lower boundary has communication with the overlying burning area. That is,water accumulation in the burning area is a major water hazard in coal seam mining. At the same time,in the case of inclined coal seams,the height of the development of water conducted zones should be greater at the upper boundary than at the lower boundary. Therefore,when calculating the development of water conducted zones in inclined coal seams,the influence of coal seam dip angle should be considered.

山东省地质矿产勘查开发局科技攻关项目(KY202223)

梁庆华,丁相军,杨聘卿,等.火烧区富水下倾斜煤层开采导水裂隙带发育特征研究[J].矿业安全与环保,2024,51(5):142-146.

LIANG Qinghua,DING Xiangjun,YANG Pinqing,et al. Research on the development characteristics of water conducted zone in mining inclined coal seams with rich water in burning area[J]. Mining Safety & Environmental Protection,2024,51(5):142-146.