多层系复杂水体下开采界限确定的工程实践  

Engineering Practice of Determining Mining Limits under Multi-layer Complex Water Body

作　　者：谢经涛 许海涛[2] 李小明[2] 刘德民[2] XIE Jingtao;XU Haitao;LI Xiaoming;LIU Demin(Juji Coal Mine of Yongcheng Energy Co.,Ltd.,Yongcheng 476612,China;North China Institute of Science and Technology,Beijing 101601,China)

机构地区：[1]永煤公司车集煤矿,河南永城476612 [2]华北科技学院,北京101601

出　　处：《煤炭技术》2024年第11期120-124,共5页Coal Technology

基　　金：国家重点研发计划(2017YFC0804108-1);河北省自然科学基金(E2017508088)。

摘　　要：车集煤矿二2煤层开采受上覆地表水、新生界底部松散孔隙承压水、砂岩裂隙水等多层系复杂水体影响。为了评价各含水体对二2煤层的影响,并以此确定二2煤层的开采界限,采用现场实测、数值模拟、理论计算等方法对二2煤层“两带”发育规律进行研究。结果表明:二2煤层导水裂隙带发育高度在42.25~47 m,垮落带发育高度约为10.53 m;顶板塑性区基本呈“蘑菇形”,采空区四周塑性区为剪切塑性区,中间为拉张塑性区;上覆地表水、新生界底部松散孔隙承压含水层、砂岩裂隙水对二2煤层开采影响较小,确定二2煤层可以全厚开采。该研究可为车集煤矿二2煤层和其他相类似条件煤层开采“两带”发育规律及开采界限研究提供参考。The mining of Ⅱ2 coal seam in Juji coal mine is affected by the overlying surface water,the confined water of the loose pores at the bottom of the Cenozoic,the sandstone fissure water and other multi-layer complex water bodies.Using on-site measurement,numerical simulation,theoretical calculation and other methods to study the development law of the"two zones"of the Ⅱ2 coal seam,determine the mining limit of the Ⅱ2 coal seam,and evaluate the influence of each water-bearing body on the I 2 coal seam.The results show that the development height of the water-conducting fracture zone in the Ⅱ2 coal seam is between 42.25-47 m,and the development height of the collapse zone is about 10.53 m.The plastic zone of the roof is basically"mushroom-shaped",the plastic zone around the goaf is a shear plastic zone,and the middle is a tensile plastic zone.Overlying surface water,loose pore confined aquifer at the bottom of the Cenozoic,and sandstone fissure water have litle effect on the mining of the Ⅱ2 coal seam,and it is determined that the Ⅱ2 coal seam can be mined at full thickness.This research can provide reference for the study on the development law of the"two zones"and mining limit of mining in Ⅱ2 coal seam of Juji coal mine and other coal seams with similar conditions.

关 键 词：多层系复杂水体 钻孔压水试验 钻孔成像试验 数值模拟 开采界限 

分 类 号：TD745[矿业工程—矿井通风与安全]