Mechanism and Numerical Simulation of Liucun Coal Mining Subsidence of Yangquan Mining Area in Shanxi

doi:10.19657/j.geoscience.1000-8527.2019.018

Abstract

Abstract:

In this paper, we investigated the single seam coal mining subsidence, and introduced in detail the geo-environment background, developing features and deformation characteristics of the Liucun coal mining subsidence of Yangquan mining area in Shanxi. Based on the geological characteristics of the rocks, 12 groups were divided and their formation mechanism was analyzed by key stratum and composite key stratum theory. Subsequently, the Hoek-Brown rock mechanical parameters were obtained, followed by inverse modeling by Flac5.0 Extrusion. Numerical simulation reflects the development and distribution of mining-induced fissures on the surface at different stages, and calculates the final magnitude of subsidence. The natural recovery period of fissures in overburden and bedrocks was estimated to be 2 and 3 months, respectively, and the fissures finally present a “θ” shape in the plane. The final magnitudes of No.1 and No.2 coal mining subsidence centers reach 4.5 m and 4 m, respectively, with the subsidence area being 1.85 times of the workface area. The results are highly consistent with the survey monitoring data, and can reflect the development process of the surface deformation and deep overburden collapse accurately, which is beneficial to subsidence mechanism analysis. The rock mechanical parameters and the simulation methods are applicable to accurate prediction on mining subsidence in Yangquan mining area.

Key words: coal mining subsidence, subsidence characteristic, subsidence mechanism, numerical simulation, rock mechanical parameter

CLC Number:

P618.11

ZHANG Chao, ZHANG Yufei, SUN Yingjie, YAO Yahui. Mechanism and Numerical Simulation of Liucun Coal Mining Subsidence of Yangquan Mining Area in Shanxi[J]. Geoscience, 2020, 34(02): 289-296.

Figures/Tables 12

References 25

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岩组	地层岩性	密度/ (kg/m³)	σ_ci/ MPa	μ	GSI	m_i	D
2	砂质页岩夹砂岩	2 610	40.3	0.24	40	7	0.8
3	中粒砂岩	2 630	75.6	0.23	50	15	0.8
4	粉砂岩、炭质页岩	2 610	44.0	0.24	40	7	0.8
5	中粒砂岩	2 630	75.6	0.23	50	17	0.8
6	砂质页岩夹煤层	2 570	29.3	0.28	40	4	0.8
7	中细粒砂岩、页岩互层	2 610	47.0	0.24	45	10	0.8
8	中粗粒砂岩、页岩互层	2 610	49.2	0.24	50	12	0.8
9	粗粒砂岩	2 630	110.6	0.23	50	19	0.8
10	砂质页岩、粉砂岩、灰岩	2 690	65.3	0.22	60	8	1.0
11	15^#煤层	1 459	33.7	0.24	50	4	0.8
12	砂岩、页岩	2 610	53.2	0.24	60	7	0.3

岩组	地层岩性	密度/ (kg/m³)	σ_ci/ MPa	μ	GSI	m_i	D
2	砂质页岩夹砂岩	2 610	40.3	0.24	40	7	0.8
3	中粒砂岩	2 630	75.6	0.23	50	15	0.8
4	粉砂岩、炭质页岩	2 610	44.0	0.24	40	7	0.8
5	中粒砂岩	2 630	75.6	0.23	50	17	0.8
6	砂质页岩夹煤层	2 570	29.3	0.28	40	4	0.8
7	中细粒砂岩、页岩互层	2 610	47.0	0.24	45	10	0.8
8	中粗粒砂岩、页岩互层	2 610	49.2	0.24	50	12	0.8
9	粗粒砂岩	2 630	110.6	0.23	50	19	0.8
10	砂质页岩、粉砂岩、灰岩	2 690	65.3	0.22	60	8	1.0
11	15^#煤层	1 459	33.7	0.24	50	4	0.8
12	砂岩、页岩	2 610	53.2	0.24	60	7	0.3

数据源	ⅠⅠ' 北	ⅠⅠ' 南	ⅡⅡ' 西	ⅡⅡ' 东	ⅢⅢ' 西	ⅢⅢ' 东
调查数据	78	64	64	65	67
模拟结果	77	63	63	62	66	67

数据源	ⅠⅠ' 北	ⅠⅠ' 南	ⅡⅡ' 西	ⅡⅡ' 东	ⅢⅢ' 西	ⅢⅢ' 东
调查数据	78	64	64	65	67
模拟结果	77	63	63	62	66	67