基于W-OH的矿区重构冻土阻水层功能评价模拟研究

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Function evaluation of reformed waterproof layer over frozen ground in mining area based on W-OH

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doi:10.12118/j.issn.1000-6060.2024.039

Abstract:

To address the challenges associated with forming frozen ground in permafrost mining areas, five concentrations of W-OH (0%, 1.5%, 2.5%, 3.5%, and 4.5%) were applied to the bottom of disturbed soil bodies to reform the waterproof layer at Muli mining area, Qinghai Provinve, China. Compressive tests, infiltration tests, and simulated rainfall tests were conducted to evaluate the reformed waterproof layer from three perspectives: physical performance, infiltration and sediment yield, and cost-effectiveness. Eight key factors influencing the reformed waterproof layer were identified using the analytic hierarchy process and expert scoring method, leading to the development of a functional evaluation system. The optimal scheme for the reformed waterproof layer was determined based on a comprehensive scoring approach. The results indicate: (1) W-OH enhanced the strength of coal gangue solidification, with the most significant improvement observed at 4.5% W-OH concentration. (2) Higher W-OH concentrations decreased the infiltration rate of the reconstructed aquiclude layer, extended the steady infiltration duration, and reduced cumulative infiltration. (3) Under rainfall conditions, increasing the W-OH concentration lowered the stable infiltration rate of coal gangue solidification, increased the average runoff rate, and elevated sediment yield. Besides, the average runoff rate and the average sediment yield are positively correlated with the concentration of W-OH and the slope gradient. (4) While the 4.5% W-OH concentration scheme achieved the highest comprehensive functional score, it posed practical challenges, such as clogging nozzles during application. Therefore, the 3.5% W-OH concentration scheme, which had the second-highest score, is recommended for practical implementation. These findings provide a theoretical basis for applying W-OH to reform waterproof layers over frozen ground in alpine mining areas.

Key words: coal refuses, W-OH, compressive test, infiltration test, simulated rainfall test, analytic hierarchy process

YANG Siyuan, YANG Hailong, YANG Penghui, ZHANG Wei, ZHANG Songyang. Function evaluation of reformed waterproof layer over frozen ground in mining area based on W-OH[J].Arid Land Geography, 2025, 48(1): 75-74.

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物理性质	粒级分布/%						干容重 /g·cm^-3	天然含水率/%	饱和体积含水率/cm³·cm^-3	饱和渗透系数/cm·min^-1	孔隙度 /%
物理性质	>10 mm	2~10 mm	1~2 mm	0.5~1 mm	0.1~0.5 mm	<0.1 mm	干容重 /g·cm^-3	天然含水率/%	饱和体积含水率/cm³·cm^-3	饱和渗透系数/cm·min^-1	孔隙度 /%
参数	24.23	38.55	6.61	12.56	12.33	5.73	1.62	13.7	0.64	0.119	29

一级指标（权重）	二级指标（权重）
物理性能（0.3119）	抗压强度（0.1681）
	残余强度（0.0927）
	峰值应变（0.0511）
入渗产流产沙（0.4905）	稳定入渗率（0.2888）
	平均产流率（0.0781）
	平均产沙率（0.1235）
经济性（0.1976）	物料价格（0.0988）
经济性（0.1976）	施工费用（0.0988）

重构阻水层	抗压强度 /kPa	残余强度 /kPa	峰值应变 /%	稳定入渗率 /mm·min^-1	平均产流率 /mm·min^-1	平均产沙率 /g·m^-2·min^-1	物料价格 /元·m^-2	施工费用 /元·m^-2
0%W-OH浓度	8.017	2.045	0.709	0.399	0.359	1.136	0.5	1.375
1.5%W-OH浓度	73.267	24.240	2.650	0.275	0.473	1.463	0.7	2.292
2.5%W-OH浓度	136.131	48.190	4.240	0.199	0.532	1.689	0.9	4.584
3.5%W-OH浓度	196.030	77.950	5.280	0.211	0.574	1.941	1.1	6.876
4.5%W-OH浓度	250.391	112.116	6.124	0.154	0.623	2.195	1.3	9.168

重构阻水层	抗压强度 /kPa	残余强度 /kPa	峰值应变 /%	稳定入渗率 /mm·min^-1	平均产流率 /mm·min^-1	平均产沙率 /g·m^-2·min^-1	物料价格 /元·m^-2	施工费用 /元·m^-2
0%W-OH浓度	0.032	0.018	1.000	0.387	1.000	1.000	1.000	1.000
1.5%W-OH浓度	0.293	0.216	0.268	0.562	0.758	0.776	0.714	0.600
2.5%W-OH浓度	0.544	0.430	0.167	0.776	0.674	0.672	0.556	0.300
3.5%W-OH浓度	0.783	0.695	0.134	0.733	0.624	0.585	0.455	0.200
4.5%W-OH浓度	1.000	1.000	0.116	1.000	0.576	0.518	0.385	0.150

重构阻水层	抗压强度/kPa	残余强度/kPa	峰值应变/%
0%W-OH浓度	8.017	2.045	0.709
1.5%W-OH浓度	73.267	24.240	2.650
2.5%W-OH浓度	136.131	48.190	4.240
3.5%W-OH浓度	196.030	77.950	5.280
4.5%W-OH浓度	250.391	112.116	6.124

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