Field experiment on hydraulic channel sealing via grouting to prevent groundwater pollution in karst region
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摘要: 岩溶区地下水系统复杂,岩溶通道发育,为封堵矿区地下水污染优势水力通道,量化评价注浆效果,本文以贵州紫木凼矿区为研究对象,对已探明的岩溶通道开展帷幕注浆封堵试验,并在注浆全过程利用电阻率法实时原位监测,评价注浆封堵效果。现场试验显示:(1)注浆过程地层电阻率升高,注浆井附近电阻率升高更为明显;(2)注浆井半径2 m区域内,浆液最大扩散面积达99.2%;(3)基于阿尔奇公式,将电阻率数据转换为地层孔隙率,结果表明注浆后扩散范围内的地层孔隙率最高降低了65.7%,平均孔隙率最高降低39.9%。研究表明,采用电阻率监测可实现对岩溶通道注浆封堵效果的实时监测和评价,为评价岩溶区地下水污染优势通道帷幕注浆封堵效果提供技术支持。Abstract:
The karst regions in southwestern China are characterized by intense karstification, complex hydrogeological conditions, and well-developed karst conduits with pronounced spatial heterogeneity. These factors contribute to the inherent vulnerability of karst groundwater systems, rendering them highly susceptible to contamination. Additionally, large-scale mining activities in these areas generate substantial volumes of wastewater and waste materials, exacerbating groundwater pollution. Consequently, the development of scientific technologies for the prevention, control, and assessment of groundwater pollution is of significant importance. This study focuses on the Zimudang mining area in Guizhou Province, where curtain grouting experiments were conducted to seal identified karst conduits, targeting the dominant hydraulic pathways of groundwater contamination. Real-time in-situ monitoring using electrical resistivity methods was employed throughout the grouting process to evaluate the effectiveness of the sealing measures. The Zimudang depression is a critical surface water convergence area within the study region, where the converging surface water is transformed into groundwater through the K20 drainage cave located beneath a steep cliff on the northeastern side of the depression. Mining activities have compromised the water-blocking function of the F1 fault, altering the groundwater flow so that it converges toward the mined-out areas and mining tunnels. Within the mining area, the K20 drainage cave serves as a channel for the concentrated recharge of groundwater by atmospheric precipitation; once entering the K20 drainage cave, the principal karst hydraulic conduits extend roughly in an east−west direction. Taking into account the characteristics of subterranean river channels, topography, and surface structures, the curtain grouting test site was determined to be located in the northern part of the tailings pond. Drilling and borehole television surveys were conducted at the site, and analysis of core logs and borehole TV results confirmed significant karst development in the underlying strata, which serve as the dominant hydraulic pathways for groundwater contamination migration. To ensure that the grout solution adequately permeates and fills fractures and karst cavities, high-pressure intermittent grouting was adopted, with grouting performed sequentially from ZJ08 to ZJ01, followed by a second round after the injected grout cooled. Throughout the entire grouting process, high-density resistivity and transient electromagnetic methods were employed to monitor changes in formation resistivity. In this experiment, one high-density electrical measurement line and eleven transient electromagnetic measurement lines were deployed. Three electrode configurations—Wenner, dipole, and Schlumberger—were utilized, with measurement depths of 15 m, 15 m, and 17 m, respectively. All three configurations demonstrated a clear increase in formation resistivity within the grouted zone, with the low-resistivity regions adjacent to the boreholes exhibiting more pronounced improvements post-grouting. For instance, among the transient electromagnetic measurement survey lines (S3, S5, S7, S8, S10, and S11), significant increases in formation resistivity were observed in lines S3, S5, S7, and S8, indicating effective grouting and sealing. In contrast, lines S10 and S11 showed either negligible changes or a decrease in resistivity after grouting. This discrepancy is attributed to the fact that line S10 was situated beyond the grouting influence zone due to its distance from the grouting wells, while line S11 exhibited localized resistivity reductions, likely caused by the displacement of water from karst cavities and fractures as grout infiltrated these features. Analysis of the geophysical monitoring data revealed that the high-density electrical method is more suitable for detecting shallow resistivity variations in areas with limited terrain, whereas the transient electromagnetic method is more effective for characterizing deeper subsurface electrical properties. To quantitatively assess the grouting effectiveness, formation porosity was derived from resistivity measurements using Archie's formula. By comparing porosity variations before and after grouting, the grout diffusion area was delineated, and the effectiveness of blocking groundwater pollution pathways was evaluated. For instance, in measurement lines S3, S5, S7, and S8, the grout diffusion area within a 2-meter radius of the grouting wells ranged from 21.42 to 99.32 m2. The maximum reduction in formation porosity reached 65.7%, with an average porosity reduction of 39.9%. This study demonstrates that electrical resistivity monitoring enables real-time in-situ evaluation of the grouting sealing effectiveness in karst conduits. In addition, by converting resistivity data into formation porosity for quantitative analysis, it is possible to accurately delineate the grouting diffusion area and sealing range, thereby assessing whether key hydraulic pathways have been effectively sealed. This approach provides robust technical support for evaluating the performance of curtain grouting in blocking the dominant groundwater contamination pathways in karst regions. -
Key words:
- Groundwater pollution /
- In-situ Monitoring /
- Curtain Grouting /
- Archie's Law /
- Porosity
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表 1 钻孔岩溶发育特征
Table 1. Development characteristics of karst in boreholes
钻孔编号 深度/m 岩溶发育特征 ZJ01 50 岩溶发育较强烈 ZJ02 60 岩溶发育较强烈 ZJ03 60 8~9 m出现岩溶裂隙,岩溶发育强烈 ZJ04 100 10~11 m出现岩溶裂隙,岩溶发育强烈 ZJ05 100 23~30 m岩层裂隙发育较强烈,在34 m、50 m范围有较多溶洞生成,岩溶发育强烈 ZJ06 60 23~24 m出现岩溶裂隙,岩溶发育强烈 ZJ07 50 9~10 m出现岩溶裂隙,岩溶发育强烈 ZJ08 50 岩溶发育较强烈 JC01 50 岩溶发育较强烈 表 2 注浆参数表
Table 2. Grouting Parameter Table
参数名称 规格/方法 注浆压力 3.5 MPa 注浆量 39.6 m3 浆液配比 水泥∶水(1∶2) 注浆方式 间歇注浆 注浆孔直径 110 mm 注浆效果监测 高密度电阻率法、瞬变电磁法 表 3 测线探测结果分析
Table 3. Survey Line Detection Results Analysis
测线 注浆效果 注浆影响范围 备注 S1 在注浆过程中较明显 1518 ~1530 m段岩溶发育较强烈 S2 1526 m以上无明显效果 ,1526 m以下效果明显1510 ~1526 m段下部岩溶发育较强烈 S3 全段效果明显 1498 ~1535 m全段岩溶发育较强烈 S4 全段效果明显 1498 ~1535 m全段岩溶发育较强烈 S5 上部效果显著 1498 ~1535 m全段岩溶发育强烈 S6 上部效果明显 1514 ~1533 m段下部岩溶发育不明显 S7 注浆钻孔附近明显 全段均有影响 岩溶发育较强烈 S8 在注浆过程中较明显 1494 ~1507 m段岩溶发育较强烈 S9 无明显效果 浆液注入钻孔时挤压水渗入附近岩层中 S10 无明显效果 测线距离注浆井较远 S11 下部效果明显 下部岩溶发育较强烈 -
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