滨海矿区地应力与岩石力学参数随埋深的变化规律及其相互关系

doi:10.11872/j.issn.1005-2518.2021.04.150

Abstract

Abstract:

The Xiling mining area in Sanshandao gold mine is the first coastal metal mining area in China.Therefore，it is of great significance for coastal rock engineering excavation design and disaster control to study the effect of the buried depth on in-situ stress，rock mechanical properties and their relationship.For this purpose，the standard rock specimen at 5 different buried depths ranging from 300 m to 1 900 m were taken from the three geological drilling in this mining area，namely ZK88-21，ZK88-14 and ZK94-2.With the aid of MTS815，the mechanical parameters and acoustic emission Kaiser point in different directions of rock at different buried depths were tested，and the mechanical properties and in-situ stress of rocks were further obtained.On this basis，the in-situ stress，rock mechanics parameters and their interrelationships at different buried depths were analyzed.The results show that the mechanics parameters，self-weight stress，vertical stress，maximum horizontal stress and minimum horizontal stress have a logarithmic relationship with the buried depth，and the increase amplitude of vertical stress is gradually smaller than that of the self-weight stress with the increase of the buried depth.Similarly，the rock mechanics parameters are roughly logarithmic to the in-situ stress.Among them，the effect of the maximum horizontal stress on the rock mechanical parameters is greater than that of the minimum principal stress.In addition，the effect of buried depth on the tensile strength is greater than its effect on the compressive strength.

Key words: coastal mining area, buried depth, geological drilling, in-situ stress, rock mechanical parameters, Xiling mining area

CLC Number:

TU452

Xi WANG,Chunde MA,Xingquan LIU,Mingwei JIANG,Yuyun FAN. The Variation Law of In-situ Stress and Rock Mechanical Parameters with Buried Depth in Coastal Mining Area and Their Relationship[J].Gold Science and Technology, 2021, 29(4): 535-544.

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钻孔编号	H/m	σ_v/MPa	σ/MPa	水平方向Kaiser效应突变点应力值/MPa			σ_H/MPa	σ_h/MPa
钻孔编号	H/m	σ_v/MPa	σ/MPa	0°（σ_Ⅰ）	45°（σ_Ⅱ）	90°（σ_Ⅲ）	σ_H/MPa	σ_h/MPa
ZK94-2钻孔	300	7.99	8.10	10.59	13.46	20.62	21.06	10.15
	600	16.55	16.2	12.86	15.47	28.10	29.60	11.36
	900	24.91	24.3	13.98	14.59	31.11	34.24	12.85
	1 200	33.23	32.4	17.19	22.01	35.03	35.93	16.29
	1 500	39.34	39.21	18.01	25.23	38.65	39.19	17.47
	1 600	43.50	43.2	19.77	30.32	44.21	44.32	19.66
ZK88-21钻孔	300	7.97	8.1	9.80	13.18	19.77	20.03	9.55
	600	17.05	16.23	14.12	16.41	28.43	29.92	14.26
	900	23.20	24.35	16.14	15.40	32.06	35.90	14.95
	1 200	33.49	32.47	17.96	22.46	34.97	35.86	17.07
	1 500	40.70	40.52	17.47	27.22	40.43	40.56	17.34
	1 800	44.90	42.94	17.52	29.31	42.62	42.70	17.44
	1 900	46.70	43.01	17.61	29.72	42.93	43.93	17.61
ZK88-14钻孔	300	7.65	8.10	11.83	15.59	20.73	20.78	11.78
	600	15.65	16.20	11.78	11.82	33.45	26.41	12.62
	900	24.71	24.30	15.75	14.98	36.80	36.30	12.31
	1 200	32.12	32.40	20.05	26.20	43.54	36.80	18.79
	1 500	41.82	40.50	20.74	22.62	44.89	42.63	17.01

钻孔编号	h/m	样品编号	弹性模量E/GPa	抗压强度σ_c/MPa	抗拉强度σ_b/MPa	钻孔编号	h/m	样品编号	弹性模量E/GPa	抗压强度σ_c/MPa	抗拉强度σ_b/MPa
ZK88-14	300	300-1	35.5	145.3	8.2	ZK94-2	1 500	1500-1	37.2	190.6	13.7
		300-2	31.3	143.2	7.3			1500-2	39.3	193.5	15.1
		300-3	29.4	138.6	6.5			1500-3	41.2	204.1	16.2
	600	600-1	31.0	147.8	9.2		1 600	1600-1	41.3	207.3	15.6
		600-2	34.2	152.9	9.7			1600-2	39.0	195.8	15.9
		600-3	37.8	163.2	8.8			1600-3	47.5	210.6	17.8
	900	900-1	32.0	107.6	9.2	ZK88-21	300	300-1	26.2	112.3	5.4
		900-2	37.2	117.3	9.8			300-2	29.7	115.4	6.7
		900-3	38.5	120.6	11.3			300-3	31.2	120.3	8.5
	1 200	1200-1	40.0	139.7	13.2		600	600-1	35.8	146.5	5.7
		1200-2	43.4	145.6	14.7			600-2	27.8	142.1	5.8
		1200-3	32.6	130.5	11.7			600-3	39.7	157.2	6.3
	1 500	1500-1	40.1	143.6	14.3		900	900-1	31.2	155.7	5.4
		1500-2	38.1	140.2	12.2			900-2	35.7	162.8	6.9
		1500-3	41.3	150.3	15.3			900-3	40.2	171.9	8.1
ZK94-2	300	300-1	27.0	77.3	5.9		1 200	1200-1	32.2	206.8	7.3
		300-2	31.7	79.3	6.8			1200-2	36.8	198.8	5.1
		300-3	36.3	86.6	7.5			1200-3	41.7	221.4	7.6
	600	600-1	30.2	143.2	8.6		1 500	1500-1	32.8	213.4	8.5
		600-2	35.3	152.4	10.1			1500-2	43.5	238.9	9.3
		600-3	40.2	163.2	9.8			1500-3	36.1	243.2	12.4
	900	900-1	39.1	136.5	10.3		1 800	1800-1	44.2	261.2	13.4
		900-2	32.4	125.6	9.2			1800-2	35.2	242.7	9.1
		900-3	42.3	144.3	10.1			1800-3	45.1	271.2	15.2
	1 200	1200-1	32.2	168.1	11.6		1 900	1900-1	42.2	287.3	11.2
		1200-2	38.6	190.3	12.7			1900-2	45.4	264.7	9.4
		1200-3	43.2	201.6	14.2			1900-3	35.5	252.3	8.8

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The Variation Law of In-situ Stress and Rock Mechanical Parameters with Buried Depth in Coastal Mining Area and Their Relationship

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