矿岩开挖松动区厚度预测及非爆机械化开采判据

doi:10.11872/j.issn.1005-2518.2021.04.010

Abstract

Abstract:

Deep mining has gradually become a new trend in underground mining，and the non-explosive mechanized mining method，as one of the alternatives to conventional drilling and blasting excavation，has shown great advantages in rock-breaking efficiency and safety.Non-explosive mechanized mining of hard rock mines is a technical problem that needs to be solved to realize continuous mining and safe，efficient and green development of deep resources in hard rock mines.In the roadway excavation，the initial stress state of the surrounding rock is destroyed to form a secondary stress field resulting in the phenomenon of stress concentration，which will form a “crushing zone” around the surrounding rock，called the excavation damage zone （EDZ）.The feasibility of non-explosive mechanized mining is closely related to the thickness of the EDZ around the ore to be cut.The existing research shows that the thickness of the EDZ is mainly affected by rock properties，ground stress，geological conditions and excavation parameters and other factors.So in this paper，the characteristics of the EDZ thickness were considered comprehensively，and five influencing factors of uniaxial compression strength，rock mass grade，burial depth，rock bulk and excavation span were selected.Through multiple regression analysis，using 69 sets of data collected at multiple mine sites，a functional relationship between the thickness of the EDZ and five influencing factors was established，so as to obtain the prediction model of the thickness of the EDZ.The results were obtained by comparing the measured data of the EDZ thickness with the prediction values obtained from the EDZ thickness prediction model.The high determination coefficient and the low root mean squared error show that the established EDZ thickness prediction model and the non-explosive mechanized mining criterion have good reliability.In addition，the weights of the five influencing factors on the thickness of the EDZ were evaluated by the entropy weight method and ranked in order.The results show that the uniaxial compressive strength has the largest influence on the thickness of the EDZ，the rock mass grade has the smallest influence on the thickness of the EDZ，and the burial depth，rock bulk density，and excavation span have increasing influence on the thickness of the EDZ.The regression prediction model can better predict the thickness of the EDZ at Kailin Maluping mine，and the predicted value meets the requirements of non-explosive mechanized mining，verifying the feasibility and rationality of non-explosive mechanized mining.

Key words: deep mining, excavation damage zone, non-explosive mechanized mining, regression analysis, entropy weight method, mining criterion

CLC Number:

TD80

Yue JING,Shaofeng WANG,Jintao LU. Thickness Prediction of the Excavation Damage Zone and Non-explosive Mechanized Mining Criterion[J].Gold Science and Technology, 2021, 29(4): 525-534.

Figures/Tables 9

Table 1

Mine field test data"

序号	单轴抗压强度σ_c/MPa	岩体质量等级F	埋深H/m	岩石容重 γ/（kN·m^-3）	开挖跨度S/m	松动区厚度L/m	序号	单轴抗压强度σ_c/MPa	岩体质量等级F	埋深 H/m	岩石容重γ/（kN·m^-3）	开挖跨度S/m	松动区厚度L/m
1	10.50	3.0	370	28.8	3.5	1.000	36	22.40	3.5	610	27.3	3.6	1.750
2	10.10	4.0	305	31.0	3.2	1.300	37	21.96	4.5	620	26.1	3.6	2.120
3	9.10	4.0	420	27.5	3.2	1.400	38	25.64	4.0	640	26.9	3.6	1.980
4	10.50	3.0	350	29.4	3.2	1.200	39	21.96	4.5	660	25.4	3.6	2.200
5	12.60	4.0	510	25.9	3.7	1.400	40	25.64	3.0	615	27.1	3.6	1.500
6	12.60	3.0	403	27.9	2.9	1.300	41	16.80	4.5	670	24.6	3.6	2.350
7	11.90	3.0	293	31.5	3.5	1.100	42	25.64	3.0	685	27.3	3.6	1.700
8	13.30	4.0	410	27.8	3.2	1.400	43	16.80	4.5	700	23.4	3.6	2.550
9	11.20	3.0	450	26.9	3.0	1.200	44	25.64	3.5	675	28.4	3.8	2.100
10	62.40	2.0	362	29.0	2.6	0.600	45	16.80	5.0	705	23.1	3.8	2.850
11	11.20	3.0	315	30.6	2.8	1.100	46	25.64	3.0	700	28.4	3.8	1.780
12	101.60	1.0	460	26.7	3.2	0.400	47	16.80	5.0	650	24.2	6.0	3.450
13	13.30	3.0	125	29.3	2.8	1.100	48	25.64	4.5	680	28.3	3.8	2.350
14	28.00	3.0	310	30.8	3.2	0.800	49	21.96	5.0	630	26.3	4.0	2.600
15	18.80	3.0	340	29.7	3.4	1.300	50	52.00	3.0	700	28.4	4.2	1.700
16	10.90	4.0	665	24.1	3.6	1.700	51	52.00	3.0	750	28.4	4.2	1.700
17	14.30	4.0	322	30.3	4.4	1.500	52	52.00	3.0	690	28.4	4.2	1.400
18	9.10	5.0	450	26.9	3.4	2.000	53	52.00	3.0	690	28.4	4.6	1.500
19	16.80	3.0	249	23.9	3.2	1.000	54	40.00	3.0	690	24.6	4.6	1.600
20	22.40	3.0	296	31.4	3.4	1.200	55	25.64	3.0	615	28.3	3.6	1.500
21	23.80	3.0	178	30.1	2.6	1.200	56	16.80	4.5	670	24.2	3.6	2.350
22	11.96	4.0	268	24.8	3.4	1.400	57	25.64	3.0	685	28.3	3.6	1.700
23	110.20	1.0	180	29.8	2.8	1.000	58	34.37	4.0	660	27.2	4.5	1.650
24	14.30	3.0	236	24.7	3.0	1.200	59	147.89	5.0	660	32.3	4.0	2.340
25	13.30	3.0	321	30.4	3.0	1.100	60	71.26	3.0	600	27.1	3.8	1.100
26	11.20	3.0	97	28.3	2.6	1.100	61	39.19	3.0	1 000	28.6	4.6	1.930
27	73.60	2.0	340	29.7	3.0	0.800	62	158.83	5.0	800	28.1	5.6	2.900
28	13.30	4.0	450	26.9	3.6	1.600	63	147.89	4.0	800	32.2	5.6	2.690
29	32.20	2.0	340	29.7	3.2	0.700	64	109.50	3.0	800	26.7	5.6	2.270
30	10.10	5.0	470	26.5	4.0	2.200	65	142.16	3.0	370	31.1	3.4	1.200
31	14.30	3.0	420	27.5	3.6	1.100	66	142.16	3.0	450	31.1	3.4	1.400
32	11.90	4.0	520	25.8	3.8	1.700	67	142.16	3.0	530	31.1	3.4	1.550
33	9.10	5.0	470	26.5	3.6	2.100	68	142.16	3.0	680	31.1	3.4	1.800
34	10.10	4.0	467	26.6	3.4	1.800	69	142.16	3.0	780	31.1	3.4	1.975
35	16.80	4.5	600	25.4	3.6	2.250

Table 1

Fig.1

Fig.2

Table 2

Fig.3

Fig.4

Fig.5

Table 3

Table 4

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孔号	钻孔中松动区位置L₁/m	钻孔后矿岩垮落厚度L₂/m	松动区实际厚度L₃/m	松动区平均厚度L₄/m
1	3.26	0.15	3.41（舍去）	2.33 （左侧：1号~6号孔）
2	2.56	0.10	2.66
3	2.70	0.05	2.75
4	1.99	0.12	2.11
5	2.10	0.13	2.23
6	1.66	0.26	1.92
7	2.65	0.07	2.72	2.49 （外侧：7号~12号孔）
8	2.15	0.16	2.31
9	2.33	0.02	2.35
10	2.44	0.18	2.62
11	1.85	0.47	2.32
12	2.22	0.39	2.61
13	2.40	0.05	2.45	2.69 （右侧：13号~18号孔）
14	2.70	0.06	2.76
15	2.65	0.13	2.78
16	2.67	0.12	2.79
17	2.68	0	2.68
18	3.03	0.13	3.16（舍去）

孔号	单轴抗压强度σ_c/MPa	岩体质量等级F	埋深H/m	岩石容重γ/（kN·m^-3）	开挖跨度S/m	平均开挖跨度S/m
1	147.89	4	490	27.048	4.94	5.06 （左侧：1号~6号孔）
2	147.89	4	490	27.048	5.21
3	147.89	4	490	27.048	5.03
4	147.89	4	490	27.048	4.94
5	147.89	4	490	27.048	5.21
6	147.89	4	490	27.048	5.03
7	147.89	4	490	27.048	4.49	4.95 （外侧：7号~12号孔）
8	147.89	4	490	27.048	5.46
9	147.89	4	490	27.048	4.89
10	147.89	4	490	27.048	4.49
11	147.89	4	490	27.048	5.46
12	147.89	4	490	27.048	4.89
13	147.89	4	490	27.048	5.85	4.95 （右侧：13号~18号孔）
14	147.89	4	490	27.048	4.81
15	147.89	4	490	27.048	4.20
16	147.89	4	490	27.048	5.85
17	147.89	4	490	27.048	4.81
18	147.89	4	490	27.048	4.20

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Thickness Prediction of the Excavation Damage Zone and Non-explosive Mechanized Mining Criterion

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影响因素	权重
单轴抗压强度σ_c	0.5865
岩体质量等级F	0.0607
埋深H	0.0929
岩石容重γ	0.1024
开挖跨度S	0.1574