Scale of Resistance of Buildings to Mining Influences – Applicability Assesment Through a Case Study

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Categories of mining area deformation [13]

Categories of mining area	The values of terrain deformation indicators
	Inclination T (mm/m)	Radius of curvature R (km)	Horizontal strain ε (mm/m)
0	T < 0.5	|R| > 40	|ε| < 0.3
I	0.5 ≤ T < 2.5	40 ≥ |R| > 20	0.3 ≤ |ε| < 1.5
II	2.5 ≤ T < 5.0	20 ≥ |R| > 12	1.5 ≤ |ε| < 3.0
III	5.0 ≤ T < 10.0	12 ≥ |R| > 6	3.0 ≤ |ε| < 6.0
IV	10.0 ≤ T < 15.0	6 ≥ |R| > 4	6.0 ≤ |ε| < 9.0
V	T ≥ 15.0	|R| ≤ 4	|ε| ≥ 9.0

Shock cases recorded on the measurement stand and estimated values in the mining forecast

Date	E (J)	PGA meas. (mm/s2)	PGA est. (mm/s2)	t Ha (s)	PGA meas./PGA est. (-)
18.04.2015	4.00E+09	258	230	3.90	1.1
05.08.2016	4.00E+06	459	151	1.54	3.0
02.01.2017	8.00E+06	629	142	1.66	4.4
27.01.2017	8.00E+06	300	143	1.55	2.1
21.02.2017	2.00E+06	313	95	1.78	3.3
14.03.2017	2.00E+06	310	121	1.72	2.6

Assessment of resistance of selected buildings according to the modified point method

		Identification of the characteristics	Number of points
1.	Building length (m)	up to 15 m	4
2.	The shape of the solid	simple building plan, compact solid	0
3.	Foundation of the building	at a constant level	0
4.	Building subsoil	non-rocky soil with the exception of stony soil	0
5.	Building structure	brick strip foundation	3
		basement walls: brick masonry	1
		the lowest storey ceiling: arched ceiling on I-beams at f/L < 1/10	4
		lintels: brick flat	2
6.	Existing protection against mining influence	no protection	15
7.	Technical condition of the building1	natural wear of building: medium	2
		building damage: cracks up to 15 mm and inclination <25 mm/m	8
Total points			39

Basic information on geological and mining conditions of the exploitation

Coal seam	Wall/parcel	Beginning of expl.	End of expl.	Coal seam thick. [m]	Dipp. ang. [deg]	Dep. [m]	Dist. [km]	Dir.	Ang. [deg]	a	System
4131	sc_5	01-10-2003	30-06-2004	1.8	5	640	0.30	SW	65	0.60	zd
4131	sc_6	01-07-2003	31-03-2004	1.8	5	640	0.38	SW	59	0.60	zd
4132	sc_1	01-07-1999	10-09-2000	2.4	5	610	0.55	W	48	0.60	zd
4132	sc_2	15-12-2000	30-09-2002	2.4	5	610	0.25	W	68	0.60	zd
416	sc_10	01-10-2003	01-06-2004	1.8	5	685	0.44	W	57	0.80	z
416	sc_8	20-03-2000	21-01-2002	1.8	5	625	0.03	NW	87	0.80	z
416	sc_9	01-07-2001	18-04-2003	2	5	655	0.00	Bezp	90	0.80	z
502	18a	01-09-2007	31-03-2008	3	5	720	0.33	NE	65	0.25	ph
502	18b	01-04-2008	01-09-2008	2.5	5	700	0.65	NE	47	0.80	z
502	sc_17a	01-04-2006	31-12-2006	3	5	720	0.38	N	62	0.25	ph
502	sc_17b	01-01-2007	01-04-2007	2.5	5	700	0.66	N	47	0.80	z
502	sc_19	01-12-2008	03-08-2009	3	5	690	0.43	NE	58	0.25	ph
5102	sc_6	01-10-2000	01-08-2001	2	5	790	0.27	NE	71	0.60	zd
5102	sc_7	01-12-2001	01-10-2002	2	5	795	0.26	NE	72	0.60	zd
5102	sc_8	01-05-2002	31-07-2003	2	5	800	0.36	N	66	0.60	zd
5103	sc_7	01-06-2004	25-03-2005	2	5	800	0.33	NE	68	0.60	zd
5103	sc_8	01-01-2005	01-08-2005	2	5	800	0.41	N	63	0.60	zd

Resistance of buildings to the influence of ground deformation – building qualification category according to the modified point method

Sum of points n (-)	Permissible horizontal strain of the subsoil εp (mm/m)	Building resistance category
≤ 20	7.0 – 9.0	4
21–2324–2930–33	6.05.04.0	3
34–3637–4344–46	3.02.52.0	2
47–4950–5657–59	1.51.00.5	1
≥ 60	≤ 0.3	0