W-OH固化剂对高寒矿区煤矸石水分入渗的影响及模型拟合

doi:10.12118/j.issn.1000-6060.2023.661

Abstract

Abstract:

A simulation experiment was conducted on the water infiltration of coal gangue columns under indoor waterlogging conditions to study the effect of different concentrations of W-OH (0%, 1.5%, 2.5%, and 3.5%) spraying treatment on the water infiltration of coal gangue in high-altitude mining areas. Three infiltration models were used to fit the infiltration process, and a one-dimensional algebraic model was used to predict the distribution characteristics of the volume water content of coal gangue profiles, and the applicability of the model was evaluated. The results indicate that: (1) The cumulative infiltration amount and the distance of wetting front advance gradually increases with the increase of infiltration time, and there is a negative correlation with the concentration of W-OH. At the same infiltration time, the higher the concentration of W-OH, the lower the infiltration rate and wetting front advance rate. Compared with the control (0% W-OH), the initial infiltration rates of the three W-OH concentrations (1.5%, 2.5%, 3.5%) decreased by 1.12%, 3.59%, and 9.64%, respectively. The stable infiltration rates decreased by 16.92%, 78.46%, and 89.23%, respectively, and the average infiltration rates decreased by 11.35%, 58.26%, and 71.02%, respectively. (2) The three infiltration models can all fit the water infiltration process of coal gangue well treated with different concentrations of W-OH. The coefficient of determination (R²) mean values of the Philip, Kostiakov, and Horton model are 0.962, 0.957, and 0.967, respectively. Among them, the Horton model has a good fitting effect. (3) During the process of water infiltration, the larger the burial depth of the same W-OH concentration, the longer it takes for water to infiltrate to each monitoring point. At the same depth, the higher the W-OH concentration, the longer it takes for water to infiltrate to each monitoring point. (4) The one-dimensional algebraic model can effectively simulate the distribution characteristics of volumetric water content in coal gangue profiles after infiltration. The root mean squared error (RMSE) and mean absolute error (MAE) between the simulated and measured values is 2.574%-3.326% and 2.308%-2.707%, respectively, with compliance index (D) values above 0.92. The research results provide theoretical guidance for the application of W-OH solidifying agent in the reconstruction of frozen soil profiles in coal gangue mountains in high-altitude and cold mining areas.

Key words: coal gangue, W-OH, accumulated infiltration amount, infiltration rate, moist front, model fitting

YANG Penghui, YANG Hailong, YANG Siyuan, ZHANG Wei, ZHANG Songyang. Effect of W-OH stabilizer on water infiltration of coal gangue in high-cold mining areas and model fitting[J].Arid Land Geography, 2024, 47(9): 1542-1554.

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物理性质	粒级分布/%						干容重 /g·cm^-3	天然含水率/cm³·cm^-3	饱和体积含水率/cm³·cm^-3	饱和渗透系数/cm·min^-1
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/cm³·cm^-3	饱和体积含水率/cm³·cm^-3	饱和渗透系数/cm·min^-1
参数	27.61	38.10	6.56	11.11	11.85	4.77	1.65	0.137	0.640	0.119

W-OH浓度/%	初始入渗率/cm·min^-1	稳定入渗率/cm·min^-1	平均入渗率/cm·min^-1	稳渗时间/min	90 min累计入渗量/cm
0.0	0.892	0.130	0.230	80	21.19
1.5	0.882	0.108	0.204	85	19.30
2.5	0.860	0.028	0.096	185	15.00
3.5	0.806	0.014	0.067	260	13.18

W-OH 浓度/%	Philip模型			Kostiakov模型			Horton模型
W-OH 浓度/%	B/cm·min^-1	S/cm·min^-1	R²	a/cm·min^-1	b/cm·min^-1	R²	I_i/cm·min^-1	I_f/cm·min^-1	k	R²
0.0	0.029	2.183	0.955	1.113	0.443	0.964	1.267	0.151	0.139	0.961
1.5	0.005	2.210	0.960	1.100	0.464	0.964	1.277	0.132	0.148	0.968
2.5	-0.055	2.304	0.962	1.071	0.537	0.947	1.246	0.054	0.132	0.968
3.5	-0.058	2.204	0.970	1.019	0.565	0.953	1.261	0.043	0.168	0.969

W-OH浓度/%	拟合函数			R²
W-OH浓度/%	m	n	方程	R²
0.0	7.760	0.462	Z_f=7.760×t^0.462	0.990
1.5	7.641	0.440	Z_f=7.641×t^0.440	0.995
2.5	7.233	0.363	Z_f=7.233×t^0.363	0.995
3.5	3.122	0.476	Z_f=3.122×t^0.476	0.982

W-OH浓度/%	0.0	1.5	2.5	3.5
α	0.380	0.350	0.148	0.209
R²	0.995	0.997	0.982	0.920

Effect of W-OH stabilizer on water infiltration of coal gangue in high-cold mining areas and model fitting

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模型评价参数	0.0%W-OH浓度	1.5%W-OH浓度	2.5%W-OH浓度	3.5%W-OH浓度
RMSE	3.326	2.834	2.771	2.574
MAE	2.707	2.308	2.640	2.445
D	0.960	0.968	0.928	0.941

深度/cm	0.0%W- OH浓度	1.5%W- OH浓度	2.5%W- OH浓度	3.5%W- OH浓度
10	4	4	11	17
20	14	15	22	64
30	26	26	61	128
40	42	52	121	214