协同理念下岩金矿脉群连续回采顶板安全跨度研究

doi:10.11872/j.issn.1005-2518.2020.03.176

Abstract

Abstract:

In order to mine strip cluster veins efficiently and safely，based on the concept of collaborative mining，the concept of cluster continuous mining and the continuous horizontal layered filling continuous mining method were proposed.First and foremost，the theoretical calculation methods of slab beam，Platts pressure arch method，thick-span ratio method，load transfer intersection line method and structural mechanics beam theory method were used，and the safety factor was introduced to calculate the roof span under different safety factors.The roof safety problem of the continuous mining method is studied.Furthermore，through the analysis，the safe stoping span of cluster continuous mining method is ranged from 23.0 m to 18.6 m. When the safety factor was 2.0，the number of roof span was modeled by ANSYS and verified by Flac^3D. For one thing，the numerical simulation results show that the maximum principal stress is 2.84 MPa，and the maximum displacement is 9.7 mm.There is only a small shear stress failure in the middle chamber.For another，the engineering example shows that: when the stope span is 18 m （rounding 18.6 m），there is rock block falling in a small local area of the roof，and the ratio of the length of the falling block to the roof span is 1.67%.The numerical simulation and engineering example results are alike.Finally，the concept of collaborative mining has strong coupling and inclusiveness.Besides，the new concept plays a guiding role for mining complex ore bodies in China，which can better meet the mining requirements.

Key words: synergistic mining, continuous mining, vein cluster, safety span, numerical simulation

CLC Number:

TD853

Xingxin NIE, Quan GAN, Jian GAO, Shanshan FENG. Research on Safety Roof Span in Continuous Mining of Gold Vein Group Under Synergistic Concept[J].Gold Science and Technology, 2020, 28(3): 337-344.

Figures/Tables 9

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岩体名称	密度/(g·cm^-3)	弹性模量/GPa	泊松比	单轴抗拉强度/MPa	黏聚力/MPa	内摩擦角/（°）
晶屑凝灰岩（围岩）	2.70	3.41	0.25	1.38	0.75	27
蚀变凝灰岩（矿体）	2.72	3.41	0.25	1.38	0.75	27
充填体	1.80	0.40	0.28	0.20	0.30	25

安全系数n	协同均算计算结果/m	不同结果离散程度
1.4	26.1	9.76
1.5	24.5	9.00
1.6	23.0	8.34
1.7	21.7	7.76
1.8	20.5	7.25
1.9	19.5	6.79
2.0	18.6	6.38
2.1	17.7	6.02
2.2	17.0	5.68
2.3	16.3	5.38

Research on Safety Roof Span in Continuous Mining of Gold Vein Group Under Synergistic Concept

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