卧虎山铁矿采场极限暴露面积回归优化模型

doi:10.11872/j.issn.1005-2518.2018.04.503

Abstract

Abstract:

In the mining of underground mines，the reasonable exposure area of stope is precondition to ensure the safety of mining operation.As the main structural parameter of underground mines，it is necessary for exposure area to be optimized.Taking Wohushan mine 27-31 line as the research object，a refined model of surface，orebody and stope model was built by using 3DMine-Midas-Flac^3Dcoupling modeling technology was built by .10 calculation schemes of stope exposure area were designed under the length conditions of 30 m and 40 m for stope.Maximum tension stress of stope roof and maximum compressive stress of wall rock were obtained through numerical simulation.The regression optimization model of exposure area with tensile stress of roof and compressive stress of wall rock was established to determine the reasonable limit exposure area of stope under the protection of safety factor.The results showed that：（1）Maximum compressive stress mainly occurs in stope pillar and maximum tensile stress appears in stope roof by stope stability analysis；（2）The relationship between exposure accumulation and stress was obtained by establishing regression function curve of exposed area and maximum tensile stress and maximum compressive stress of stope.Under the same stope exposure area condition，the longer the stope，the smaller tensile stress.With same stress limit case，the longer the stope，the bigger exposure limit；（3）Taking the mine production safety coefficient of 1.3 as the base，according to occurrence condition of orebody and stope，the limit exposed area of Wohushan mine was determined to be 450 m²and 600 m²by the regression function curve using 30 m and 40 m length of stope. When rock mass mechanical parameters change，the limit exposure area and span value of stope was confirmed through adaptive decision of the regression function curve.

Key words: stability of stope, structural parameters, stope exposure area, fine modeling, numerical simulation, linear regression, optimize model, safety factor

CLC Number:

TD853.3

Jianhua HU,Qifan REN,Zhonghua QI,Jiwei ZHANG. Regress Optimize Model of Limit Exposure Area to Stope in Wohushan Iron Mine[J].Gold Science and Technology, 2018, 26(4): 503-510.

Figures/Tables 11

Fig.1

Fig.2

Table 1

Mechanical parameters of rock mass in Wohushan mine"

岩体名称	弹性模量（E）/GPa	泊松比（ $μ$ ）	抗拉强度/MPa	抗压强度/MPa	内聚力（ $C$ ）/MPa	内聚力（ $φ$ ）/（°）	密度（ $ρ$ ）/（kg·m^-3）
矿体	11.67	0.25	3.5	23.30	4.32	29.42	3 490
围岩	11.67	0.26	1.5	10.54	3.20	27.48	2 680
夹石	4.22	0.26	0.5	1.03	0.32	25.56	2 680

Table 1

Table 2

Fig.3

Table 3

Fig.4

Fig.5

Table 4

Linear fitting results between exposed area and maximum tensile stress and maximum compressive stress respectively"

应力类型	采场长/m	斜率	截距	方差	规律模型
顶板最大拉应力	30	0.00407	0.748	0.955	$y = 0.0041 x + 0.748$
顶板最大拉应力	40	0.00597	-0.902	0.986	$y = 0.006 x - 0.902$
两帮最大压应力	30	0.02283	7.708	0.9849	$y = 0.0228 x + 7.708$
两帮最大压应力	40	0.02129	4.87	0.9834	$y = 0.0213 x + 4.87$

Table 4

Fig.6

Fig.7

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方案编号	顶板最大拉应力/MPa	两帮最大压应力/MPa
1	1.87	14.44
2	2.41	15.96
3	2.60	17.51
4	2.82	19.02
5	3.19	21.47
6	1.43	13.79
7	2.19	15.06
8	2.70	17.35
9	3.14	20.11
10	3.94	21.91

Regress Optimize Model of Limit Exposure Area to Stope in Wohushan Iron Mine

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