摘要
定向钻孔注浆是防治煤层底板水害的重要技术。基于邱集煤矿水文地质特征,利用COMSOL Multiphysics中达西两相流模块建立灰岩岩溶裂隙含水层的钻探裸孔注浆模型,开展顺层分支裸孔注浆浆液扩散的模拟研究,分析不同渗透率灰岩注浆裸孔浆液扩散特性。结果表明:随着时间的推移,浆液扩散呈孔口位置扩散距离远、裸孔末端扩散距离近的特征;渗透率增加3.5×10^(-12)m^(2)时,浆液扩散面积增加300~500 m^(2),注浆孔口的浆液扩散形态差异明显;渗透率为8.5×10^(-12)m^(2)时,浆液在孔口横向扩散距离为45 m;渗透率为1.5×10^(-12)m^(2)时,浆液在孔口横向扩散距离仅为20 m,浆液扩散形态沿裸孔呈细长状。结合工程实践分析表明,在渗透率为1.2×10-12,5.4×10^(-12)m^(2)和8.9×10^(-12)m^(2)附近的徐灰岩溶裂隙区域,获得的浆液实际扩散距离稍小于浆液模拟扩散距离,主要是因为实际岩溶裂隙开度、粗糙度不一等原因所致,验证了模拟研究结果的准确性。研究结果为黄河北煤田类似水害问题的治理和定向钻孔高质量精准注浆技术提供了科学参考。
Directional drilling grouting is an important technology to prevent and control water disasters in coal seam floor.Based on the hydrogeological characteristics of Qiuji coal mine,a drilling open-hole grouting model for limestone karst fractured aquifers was established using the Darcy two-phase flow module in COMSOL Multiphysics.A simulation study on the diffusion of layered branch open-hole grouting slurry was conducted,and the diffusion characteristics of open hole grouting slurry for limestone with different permeability rates were analyzed.It is found that over time,the diffusion of slurry exhibits the characteristics of long diffusion distance at the pore opening and close diffusion distance at the end of the bare hole.When the permeability increases by a amount of 3.5×10^(-12)m^(2),the diffusion area of the slurry increases by 300~500 m^(2),and there is a significant difference in the diffusion morphology of the slurry at the grouting orifice.When the permeability is 8.5×10^(-12)m^(2),the lateral diffusion distance of the slurry at the pore opening is 45 m.When the permeability is 1.5×10^(-12)m^(2),the lateral diffusion distance of the slurry at the pore opening is only 20 m,and the diffusion form of the slurry is elongated along the open hole.An engineering practice analysis shows that the actual diffusion distance of the obtained slurry is slightly smaller than the simulated diffusion distance of the slurry in the Xu limestone karst fracture area with permeabilities of 1.2×10^(-12)m^(2),5.4×10^(-12)m^(2),and 8.9×10^(-12)m^(2),mainly due to differences in the opening and roughness of the actual karst fractures,which indicates the accuracy of the simulation research results.The research could provide a scientific reference for the treatment of similar water disasters in the north coal field of the Yellow River and the high-quality precision grouting technology of directional drilling.
作者
陈军涛
朱君
张呈祥
贾东秀
张毅
傅子群
刘磊
王恩超
CHEN Juntao;ZHU Jun;ZHANG Chengxiang;JIA Dongxiu;ZHANG Yi;FU Ziqun;LIU Lei;WANG Enchao(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China;Shandong Energy Group Xibei Mining Co.,Ltd.,Xi’an 710018,China;Qiuji Coal Mine,Shandong Energy Xinwen Mining Group Co.,Ltd.,Dezhou,251105,China;Jining City Energy Comprehensive Law Enforcement Detachment,Jining 272000,China)
出处
《西安科技大学学报》
CAS
北大核心
2023年第4期667-674,742,共9页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(51974172)
煤炭资源高效开采与洁净利用国家重点实验室资助项目(2021-CMCU-KF015)
山东省自然科学基金项目(ZR2022ME140,ZR201911150152)
山东科技大学科研创新团队支持计划项目(2018TDJH102)。
关键词
渗透率
定向注浆
注浆裸孔
岩溶裂隙
浆液扩散
permeability
directional grouting
grouting bare holes
karst fissures
slurry diffusion
