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工程科学与技术:2020,52(4):89-96
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基于自然电位的充填裂隙溶质运移特征试验研究
(1.安徽大学 资源与环境工程学院,安徽 合肥 230601;2.安徽省矿山生态修复工程实验室,安徽 合肥 230601)
Experimental Study on Solute Transport Characteristics of Filling Fracture Based on Self-potential
(1.School of Resource and Environmental Eng., Anhui Univ., Hefei 230601, China;2.Anhui Province Eng. Lab. for Mine Ecological Remediation, Anhui Univ., Hefei 230601, China)
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投稿时间:2019-07-28    修订日期:2019-12-20
中文摘要: 为精细描述充填裂隙溶质运移过程及其特征,设计加工了充填裂隙溶质运移试验模型,开展了不同流速条件下溶质运移试验,研究了充填裂隙溶质运移特征,结合不同测点自然电位(SP)实时动态监测数据,研究充填裂隙内部溶质运移过程。结果表明:1)在试验流速0.0733~0.9630 mm/s范围内,充填裂隙渗透系数为1.85 mm/s,与充填多孔介质渗透系数1.79 mm/s较为接近,水流符合达西定律。2)试验过程中,水流实际平均流速为0.247、0.431、0.661 mm/s时,取样口处溶质峰值浓度分别为5.14、5.50、5.78 g/L,溶质初始到达和峰值到达时间均减少,其中初始到达时间分别为464026401560 s,峰值到达时间分别为548033602040 s。3)3种水流实际流速条件下,溶质运移过程中SP响应呈现出相似特征,沿水流方向从1#到6#测量电极处峰值SP绝对值逐渐减小,且峰值前SP响应曲线陡峭程度逐渐降低;此外,溶质弥散前锋与溶质弥散峰值浓度点随水流动均呈匀速运移状态,其中溶质弥散前锋相应的平均流速分别为0.214、0.396、0.685 mm/s,溶质弥散峰值相应的平均流速为0.189、0.347、0.571 mm/s。4)基于峰值SP计算的水流实际平均流速与采用溶质峰值浓度计算结果基本一致,但基于峰值SP计算结果更接近实际平均流速(流量计算结果),准确度提高1.5%;随着流速不断增加,采用峰值SP计算的宏观平均流速误差降低9.9%。5)试验发现,与峰值SP值相比,采用初始SP值计算的充填裂隙水流宏观平均流速更接近由流量数据计算的水流宏观平均流速。
Abstract:In order to describe the solute transport process and characteristics in the filling fracture, the solute transport test model of filling fracture was designed and manufactured. The solute transport tests under different flow velocity conditions were carried out. The solute transport characteristics in the filling fracture were studied and the internal solute transport process was described in detail combining with the real-time dynamic monitoring data of self-potential (SP) at different measuring points. The results showed that: 1)In the range of 0.07330.9630 mm/s, the permeability coefficient of the filling fracture was 1.85 mm/s, which was close to the permeability coefficient of the filled porous medium 1.79 mm/s, and the water flow complies with Darcy’s law; 2) When the actual average flow velocity was 0.247 mm/s, 0.431 mm/s, 0.661 mm/s, the peak solute concentration at the sampling point was 5.14 g/L, 5.50 g/L, 5.78 g/L, and the initial and peak solute arrival times were all reduced, with the initial arrival times of 4640 s, 2640 s, and 1560 s, and the peak arrival times of 5480 s, 3360 s and 2040 s, respectively. 3) Under the conditions of the actual flow velocity of the three kinds of water currents, the SP response showed similar characteristics during the solute transport. The absolute value of the SP peak at the measuring electrode was gradually reduced from 1# to 6# along the flow direction, and the steepness gradually decreased when the peaks came out in sequence. In addition, both the solute dispersion front and the solute dispersion peak concentration point were moving at a uniform speed with the flow of water, and the corresponding average initial flow velocity of the solute dispersion front were 0.214 mm/s, 0.396 mm/s, 0.685 mm/s, and the average flow velocity peaks corresponding to the solute dispersion peaks were 0.189 mm/s, 0.347 mm/s and 0.571 mm/s. 4) The actual average flow velocity based on the peak SP calculation was basically the same as the calculation result using the peak solute concentration, but the peak SP calculation result was closer to the actual average flow velocity (flow calculation result), and the accuracy was increased by 1.5%; as the flow rate continued to increase, the macro-average flow velocity error calculated from the peak SP was reduced by 9.9%. 5) The test showed that compared with the peak SP value, the macroscopic average velocity of the filling fractured flow calculated using the initial SP value was closer to the macroscopic average velocity of the flow calculated from the flow data.
文章编号:201900752     中图分类号:P641.69    文献标志码:
基金项目:国家自然科学基金项目(41602310);中国博士后科学基金项目(2017M611044)
作者简介:姜春露(1984-),男,副教授,博士. 研究方向:水文地质. E-mail:cumtclj@cumt.edu.cn
引用文本:
姜春露,汪根强,郑刘根,徐康,程桦.基于自然电位的充填裂隙溶质运移特征试验研究[J].工程科学与技术,2020,52(4):89-96.
JIANG Chunlu,WANG Genqiang,ZHENG Liugen,XU Kang,CHENG Hua.Experimental Study on Solute Transport Characteristics of Filling Fracture Based on Self-potential[J].Advanced Engineering Sciences,2020,52(4):89-96.