| 基于物化特性的煤层注水难易程度模型 |
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| 引用本文： | 王刚,冯净,陈雪畅,闫松,李胜鹏.基于物化特性的煤层注水难易程度模型[J].岩土力学,2022,43(Z2):144-154. |
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| 作者姓名： | 王刚 冯净 陈雪畅 闫松 李胜鹏 |
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| 作者单位： | 1. 山东科技大学 矿山灾害预防控制省部共建国家重点实验室培育基地，山东 青岛 266590；
2. 山东科技大学 安全与环境工程学院，山东 青岛 266590；3. 山东科技大学 能源与矿业工程学院，山东 青岛 266590 |
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| 基金项目： | 国家自然科学基金资助项目（No.51934004，No.51974176）；泰山学者专项经费资助（No.TS20190935）；山东省杰出青年自然科学基金重点项目（No.ZR2020JQ22） |
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| 摘 要： | 增强煤层注水能力是目前需要亟待解决的问题，而煤层注水难易程度缺乏准确的判别标准。通过考虑煤体孔裂隙渗流分形结构特征和毛细作用下化学润湿特性，建立了煤层注水渗流量模型；基于概率论与数理统计方法基础，构建了集对联系度区间评价体系，划分了煤层注水的难易程度。结果显示：（1）注水效果受孔隙率、孔隙半径、接触角、液体的密度、表面张力、黏滞性系数、重力加速度等渗流结构参数和化学润湿特性等最简参数的影响，体系模型表征了煤体渗流结构和化学润湿特性与渗流量的关系。（2）在组合赋权下，孔隙率权重为0.32，对注水效果贡献较大，最大孔喉半径和接触角的贡献度次之；最小孔喉半径权重为0.17，对注水效果影响最小。（3）煤样X1、X2、X5评价指标值介于（0，0.25），属于难注水煤层；煤样X3、X4评价指标值介于（0.25，0.50），属于较难注水煤层。
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| 关 键 词： | 煤层注水 物化特性 难易程度 评价模型 |
| 收稿时间： | 2021-04-14 |
| 修稿时间： | 2021-06-04 |
Model of difficulty degree of coal seam water injection based on physical and chemical characteristics |
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| WANG Gang,FENG Jing,CHEN Xue-chang,YAN Song,LI Sheng-peng.Model of difficulty degree of coal seam water injection based on physical and chemical characteristics[J].Rock and Soil Mechanics,2022,43(Z2):144-154. |
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| Authors: | WANG Gang FENG Jing CHEN Xue-chang YAN Song LI Sheng-peng |
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| Institution: | 1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Teclnonogy, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 2. School of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 3. School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China |
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| Abstract: | Enhancing coal seam water injection capacity is an urgent problem to be solved, and the difficulty of coal seam water injection lacks accurate criteria. By considering the characteristics of the seepage fractal structure of the pores and cracks of the coal and the chemical wetting characteristics under capillary action, a model of the seepage flow of coal seam water injection is established. Based on the methods of probability theory and mathematical statistics, a set-pair connection degree interval evaluation system is constructed, and the difficulty of water injection into the coal seam is divided. The results show that: 1) The effect of water injection is affected by the simplest parameters such as porosity, pore radius, contact angle, liquid density, surface tension, viscosity coefficient, gravitational acceleration and other seepage structural parameters as well as chemical wetting characteristics. The system model characterizes the relationship between the seepage structure and chemical wetting characteristics of coal and the seepage flow. 2) Under combined weighting, the porosity weight is 0.32, which has a greater contribution to the water injection effect, followed by the maximum pore throat radius and contact angle, and the minimum pore throat radius weight is 0.17, which has the least impact on the water injection effect. 3) The evaluation index values of coal samples X1, X2 and X5 are between (0, 0.25), which indicate that the coal seam belongs to the coal seam with difficult water injection; the evaluation index values of coal samples X3 and X4 are between (0.25, 0.50), which imply the coal seam belongs to the one relatively difficult to inject water. |
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| Keywords: | water injection characteristics of physicochemical degree of difficulty model of evaluation |
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