摘要
在淮北煤田普遍采用地面定向钻高压注浆技术治理煤系底板岩溶水害。注浆后渗流场补径排路径发生变化,且注浆实施中注浆高压以及浆液析水会在一定时期内改变受注目标含水层地下水渗流场和化学场的分布特征。以淮北煤田桃园煤矿为研究对象,利用Feflow软件,构建了区域注浆扰动下目标层渗流场与化学场(简称“双场”)演化模型,探讨了“双场”耦合机制,选择受环境影响较小的Cl−为模拟因子,开展了“双场”耦合作用下溶质运移影响因素分析,在此基础上构建了区域注浆扰动下溶质扩散预测模型。研究结果表明:识别验证后渗流场模型中,模拟水位与实测水位误差小于3 m的点占71.9%,模拟效果较好;识别验证后化学场模型中,Ⅱ4采区溶质运移模拟效果较好,Ⅱ1采区模拟值偏低约14.4 mg/L,误差约为实际值的6.6%,低于10%,总体模拟效果较好。渗透系数相对较大的Ⅱ4采区和Ⅱ2采区Cl−较容易运移扩散;而渗透系数较小的Ⅱ1采区岩石致密,渗透性较差,模型运行50 a期间,其基本以“滞水”状态存在。基于注浆扰动下Ⅱ4采区局部渗流场演化特征,认为溶质运移主要受渗透系数、弥散度、水力梯度、渗透流速、注浆时间、浆液相对密度等参数控制,并发现在注浆结束后18~22 a Cl−质量浓度达到峰值,随后Cl−质量浓度开始降低,约在40 a后达到区域注浆之前的平衡状态。基于多次设参运行获得数据,建立了“双场”耦合作用下溶质扩散的预测模型,误差率小于10%的数据占比达81.4%,说明所建立的溶质扩散预测模型基本可靠。研究可为区域注浆扰动下受注目标含水层水环境演化研究以及煤矿水害预测预警提供科学依据,具有重要的理论和实践意义。
In Huaibei coalfield,the technology of ground directional drilling and high-pressure grouting is widely used to control the karst water disaster of coal measures floor.After grouting,the filling and drainage path of the seepage field changes,and the grouting high pres-sure and the slurry water will change the distribution characteristics of the groundwater seepage field and chemical field of the injected tar-get aquifer in a certain period of time.Taking Taoyuan Coal Mine in Huaibei Coalfield as the research object,the evolution model of seep-age field and chemical field(referred to as“double field”)of the target layer under regional grouting disturbance is built by using the soft-ware of Feflow,the coupling mechanism of“double field”is discussed,and the Cl−which is less affected by the environment is selected as the simulation factor,and the analysis of the factors affecting solute transport under the“double field”coupling effect is carried out.On this basis,the mathematical model of solute diffusion under regional grouting disturbance is constructed.The results show that in the seep-age field model after identification and verification,71.9%of the points where the error between the simulated water level and the meas-ured water level is less than 3m,and the simulation effect is good;Among the identified and verified chemical field models,the simulation effect of solute transport in mining area II4 is good,and the simulation value in mining area II1 is about 14.4 mg/L lower,with an error of about 6.6%of the actual value,less than 10%.The overall simulation effect is good.The Cl−in mining area II4 and II2 with relatively high permeability coefficient is easy to migrate and diffuse,while the rock in mining area II1 with low permeability coefficient is dense and has poor permeability.During the 50 years of model operation,it basically exists in the state of“stagnant water”.Based on the evolution char-acteristics of local seepage field in II4 mining area under grouting disturbance,it is considered
作者
郭艳
桂和荣
魏久传
胡满聪
郭祥东
聂锋
陈永青
解建
叶爽
李俊
GUO Yan;GUI Herong;WEI Jiuchuan;HU Mancong;GUO Xiangdong;NIE Feng;CHEN Yongqing;XIE Jian;YE Shuang;LI Jun(National Engineering Research Center of Coal Mine Water Hazard Controlling,Suzhou University,Suzhou 234000,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Mine Water Resource Utilization of Anhui Higher Education Institutes,Suzhou University,Suzhou 234000,China;Huaibei Mining Co.,Ltd.,Suzhou 235000,China;Anhui Hengyuan Coal&Electric Co.,Ltd.,Suzhou 234000,China)
出处
《煤炭科学技术》
EI
CAS
CSCD
北大核心
2023年第7期152-166,共15页
Coal Science and Technology
基金
安徽省高校优秀科研创新团队资助项目(2022AH010081)
安徽省高校自然科学重点资助项目(2022AH051369)
安徽省公益性地质资助项目(2023-g-1-11)。
关键词
区域注浆扰动
渗流场−化学场耦合模型
溶质运移
数值模拟
底板水害
regional grouting disturbance
coupling of seepage field and chemical field
solute diffusion prediction model
solute diffusion prediction model
numerical simulation using Feflow software
