动力扰动下深部出矿巷道围岩的变形特征

doi:10.11872/j.issn.1005-2518.2019.02.232

黄金科学技术 ›› 2019, Vol. 27 ›› Issue (2): 232-240.doi: 10.11872/j.issn.1005-2518.2019.02.232

动力扰动下深部出矿巷道围岩的变形特征

王春^1,^2,³(),王成¹,熊祖强¹,程露萍^1,²,王怀彬¹

1. 河南理工大学能源科学与工程学院，河南焦作 454000
2. 中南大学资源与安全工程学院，湖南长沙 410083
3. 煤炭安全生产河南省协同创新中心，河南焦作 454000

收稿日期:2018-04-14 修回日期:2018-11-07 出版日期:2019-04-30 发布日期:2019-04-30
作者简介:王春（1986-），男，安徽淮南人，讲师，从事岩石冲击动力学和采矿工艺方面的研究工作。wczy115728@163.com
基金资助:
河南省高校重点科研项目“地热新能源合理开采涉及的气—水—岩三态平衡机制研究”（编号：18A440014）、河南理工大学博士基金项目“高静载高温状态下深部岩石动力学特性研究”（编号：672707）、河南省重点研发与推广专项（科技攻关）项目“气液自行循环开采高温岩体地热能技术研究” （编号：192102310247）和深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放研究基金项目“高静载卸荷过程中受冲击小扰动时煤岩的破坏机理”(编号：SJF201803)

Deformation Characteristics of the Surrounding Rock in Deep Mining Roadway Under Dynamic Disturbance

Chun WANG^1,^2,³(),Cheng WANG¹,Zuqiang XIONG¹,Luping CHENG^1,²,Huaibin WANG¹

1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan，China
2. School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan，China
3. The Collaborative Innovation Center of Coal Safety Production of Henan，Jiaozuo 454000，Henan，China

Received:2018-04-14 Revised:2018-11-07 Online:2019-04-30 Published:2019-04-30

摘要/Abstract

摘要：

以冬瓜山铜矿井下900 m深处的出矿巷道作为研究对象，基于“隔一采一充一”阶段凿岩、分段崩落的回采方案，利用FLAC^3D数值模拟软件研究了静动态开挖过程中出矿巷道围岩的变形特征。模拟相关岩体力学参数由三轴压缩及频繁冲击扰动试验数据折减获得，采用Mohr-Coulomb模型进行静态开挖分析，结合Strain-Softening模型进行动态扰动影响模拟分析。研究结果表明：爆破产生的扰动促使围岩变形加剧，但不会改变静态开挖时围岩变形演化的规律；开挖时巷道周边产生应力卸荷现象，且顶板出现拉应力，靠近采场巷道两帮应力离散性大，造成顶板易产生拉伸破坏，靠近采场巷道两帮易发生片帮；结合深部出矿巷道实际稳定情况，推测巷道顶板及靠近采场部位易产生破坏，需加强支护，其余部位稳定性相对较好。

关键词: 深部开采, 动力扰动, 采矿方案, 数值模拟, 出矿巷道, 变形特征

Abstract:

When deep rock mass is in a complex geological and mechanical environment, factors such as high stress and blasting disturbance usually affect the stability of surrounding rock in deep roadway directly.At present,the research analysis to deformation characteristics of surrounding rock in deep mine roadway is still inadequate,especially the actual destruction of roadway surrounding rock.So it is significant to study deformation characteristics of surrounding rock under dynamic disturbance, which can provide theoretical reference for supporting deep roadway surrounding rock.Through the investigation and analysis of engineering geological conditions of Dongguashan copper mine and occurrence conditions of No.Ⅰ orebody, the study on deformation regularity of roadway surrounding rock under static and dynamic load was conducted, and the numerical model is established according to the mining scheme.Therefore,taking the mine roadway of Dongguashan copper mine in the downhole 900 m deep as the research object,FLAC^3D numerical simulation software was used to analyze the deformation characteristics of surrounding rock in the mining roadway, which based on the stopping scheme of the stage drilling block caving about “one charge one by one”.At first, the static and dynamic mechanical parameters of marble, skarn, serpentine, siltstone were measured through the indoor rock mechanics test, then the static and dynamic parameters of rock mass were obtained based on the generalized hoek-brown criterion. That is also to say, the simulated mechanical parameters of rock mass were obtained by reduced triaxial compression and frequent impact perturbation test data.After the establishment of the numerical calculation model, the Mohr-Coulomb model was used for static excavation analysis, and the dynamic disturbance impact simulation analysis was carried out with the Strain-Softening model, both of them were used to analyze the stress evolution and displacement evolution in roof and floor of roadway as well as both sides of surrounding rock.At last, the accuracy of the numerical simulation results was analyzed based on the actual failure of surrounding rock in the deep excavation of Dongguashan copper mine.The results show that the static and dynamic softening parameters of deep rock mass are obtained by reduction,based on test data of triaxial compression and frequent disturbance,which can be used as the basic parameters of numerical simulation analysis.What’s more, stress unloading occurred around the roadway, tensile stress appeared on the roof, while the stress on the floor was relatively small.The stress dispersion of the roadway side near the stope is greater than other side, and the change trend of stress isn’t obvious during dynamic disturbance.With the proceeding of excavation, the displacement increment of the roadway roof and the side roadway near the stope is larger than the side roadway deviated from the stope.At the same time, the roadway floor appears stable period, that is, the displacement does not change.Combined with the actual failure situation of surrounding rock in deep mining roadway, it can be speculated that roadway roof and the side roadway near the stope are prone to damage.As a result,the support should be strengthened and the rest parts are relatively stable.

Key words: deep mining, dynamic disturbance, mining method, numerical simulation, ore-drawing roadway, deformation characteristics

中图分类号:

TU856

王春,王成,熊祖强,程露萍,王怀彬. 动力扰动下深部出矿巷道围岩的变形特征[J]. 黄金科学技术, 2019, 27(2): 232-240.

Chun WANG,Cheng WANG,Zuqiang XIONG,Luping CHENG,Huaibin WANG. Deformation Characteristics of the Surrounding Rock in Deep Mining Roadway Under Dynamic Disturbance[J]. Gold Science and Technology, 2019, 27(2): 232-240.

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岩性	c_d/MPa	φ_d/(°)	抗拉强度/MPa	抗压强度/MPa	变形模量/GPa
大理岩	2.45	33.66	0.24	4.91	8.45
矽卡岩	4.91	44.98	0.05	5.92	13.92
蛇纹岩	4.70	37.02	0.62	12.17	6.59
粉砂岩	3.29	26.94	2.37	11.17	13.85

岩性	冲击扰动次数n/次	抗压强度/MPa	变形模量/GPa	泊松比	c_d/MPa	φ_d/(°)	τ_d/MPa	G_d/GPa	γ_d/ε
矽卡岩	0	22.29	153.16	0.27	7.30	19.86	15.35	60.30	2.55E-04
	5	21.80	127.89	0.27	7.14	19.78	14.98	50.35	2.98E-04
	10	20.53	112.50	0.27	6.74	19.56	14.04	44.29	3.17E-04
	15	18.49	83.11	0.27	6.10	19.17	12.53	32.72	3.83E-04
	20	15.66	69.86	0.27	5.21	18.53	10.46	27.50	3.90E-04
	25	12.02	64.33	0.27	3.99	16.84	7.63	25.33	4.01E-04
蛇纹岩	0	14.98	103.34	0.24	4.97	18.65	10.03	41.67	2.41E-04
	5	14.69	81.90	0.24	4.88	18.57	9.82	33.03	2.97E-04
	10	13.69	67.08	0.24	4.58	18.27	9.10	27.05	3.36E-04
	15	13.00	57.00	0.24	4.38	18.05	8.61	22.98	3.75E-04
	20	10.28	50.65	0.24	3.56	17.02	6.70	20.42	3.98E-04

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动力扰动下深部出矿巷道围岩的变形特征

Deformation Characteristics of the Surrounding Rock in Deep Mining Roadway Under Dynamic Disturbance

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