摘要
为获取与采掘生产相关的地应力、围岩结构、强度及底板岩体矿物成分等基础数据,优化文家坡煤矿4号煤层巷道支护参数,采用原位钻孔窥视、水压致裂法、钻孔触探法及X射线衍射分析等方法,测试与分析顶帮煤岩体结构与强度特征、原岩应力场分布规律及底板岩体矿物成分等地质力学参数。结果表明,文家坡煤矿41、42盘区地应力场在量值上属于中—高应力值区域,计算最大水平主应力为26.72 MPa,最大垂直应力为15.04 MPa,最大水平主应力优势方向为NNE方向,应力场类型以σ_H>σ_V>σ_h型为主、σ_V>σ_H>σ_h型为辅;与锚杆(索)支护直接相关的主要为4号煤层、泥岩和砂质泥岩,41盘区巷帮煤体完整性差,42盘区巷帮煤体完整;预留顶煤强度主要在10~30 MPa,泥岩强度集中在10~41 MPa,砂质泥岩强度集中在25~56 MPa;底板黏土矿物含量平均值接近50%,主要为高岭石,其次为伊蒙混层,最后是伊利石,4号煤层底板如果直接暴露于外表,需注意矿井水的影响。地质力学参数测试为矿井的安全及高效生产提供了更为详细和准确的基础数据。
In order to obtain basic data related to mining production,such as ground stress,rock structure,strength,and mineral composition of the floor rock mass,and to optimize the support parameters of No.4 coal seam roadway in Wenjiapo Coal Mine,in-situ drilling observation,hydraulic fracturing,borehole probing,and X-ray diffraction analysis methods were used to test and analyze the geomechanical parameters such as the structure and strength characteristics of the roof rock mass,the distribution law of the original rock stress field,and the mineral composition of the floor rock mass.The results showed that the stress field in the 41 and 42 panels of Wenjiapo Coal Mine belonged to the medium-high stress value area,with the maximum horizontal principal stress value of 26.72 MPa and the maximum vertical stress value of 15.04 MPa.The dominant direction of the maximum horizontal principal stress was NNE,and the stress field type was mainly of theσH>σV>σh type,with theσV>σH>σh type as the secondary.The main factors directly related to the anchor(cable)support were No.4 coal seam,mudstone,and sandy mudstone.The integrity of the coal body in the 41 panel roadway side was poor,while that in the 42 panel was complete.The strength of the reserved top coal was mainly concentrated in the range of 10~30 MPa,the strength of mudstone was mainly concentrated in the range of 10~41 MPa,and the strength of sandy mudstone was mainly concentrated in the range of 25~56 MPa.The average content of clay minerals in the floor was close to 50%,mainly consisting of kaolinite,followed by illite-montmorillonite interlayer,and finally illite.If the No.4 coal seam floor is directly exposed,the influence of minefield water should be considered.Geomechanical parameter testing provides more detailed and accurate basic data for the safety and efficient production of the mine.
作者
武龙云
Wu Longyun(CCTEG Coal Mining Research Institute,Beijing 100013,China;Mining and Design Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China)
出处
《能源与环保》
2023年第11期44-50,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金项目(51804159)
中煤科工开采研究院有限公司科技创新基金面上项目(KCYJY-2023-MS-09)。
关键词
地质力学参数
原位测试
X射线衍射分析
支护参数优化
geomechanical parameters
in-situ testing
X-ray diffraction analysis
optimization of support parameters
