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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第10期    总第278期    2017年10月

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文章编号:1672-7207(2017)10-2759-06
基于岩体时变力学参数的深部矿段回采顺序优化
胡建华1,习智琴1,罗先伟2,周科平1,艾自华1

(1. 中南大学 资源与安全工程学院,湖南 长沙,410083; 2. 广西高峰矿业股份有限责任公司,广西 南丹,547200)

摘 要: 基于岩体力学的时变参数演化规律,设计高峰深部矿段5种可行的回采顺序方案。运用耦合建模技术构建深部矿段复合空区的三维有限元模型,再采用FLAC3D仿真技术,实现岩体时变力学参数下不同回采顺序的时空演化规律。研究结果表明:各种回采顺序下的局部岩体最大拉应力和压应力都达到岩体的抗拉和抗压强度,应及时处理采空区;随着回采推进,顶底板位移逐渐增大,在最后1步达到最大值,并且受不同工艺的影响,最大位移表现出差异性;顶板位移最大沉降分别为50.0,38.0,74.0,64.9和70.5 mm,底板最大垂直位移(底鼓)分别为68.6,34.9,47.6,45.8和46.4 mm;岩体的破坏主要表现为剪切和拉伸塑性破坏,其中方案3和方案4的剪切破坏体积比方案1,2和5的剪切破坏体积,方案5发生拉伸破坏体积最大,方案2的整体塑性区体积比方案1的稍大。综合采场的生产能力和形变应力及其塑性破坏特征分析,选择较优的方案2。

 

关键词: 时变力学参数;回采顺序;时变应力与变形;塑性破坏;优化

Optimization of mining sequence based on rock mass time-varying mechanics parameters
HU Jianhua1, XI Zhiqin1, LUO Xianwei2, ZHOU Keping1, AI Zihua1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. Guangxi Gaofeng Mining Co. Ltd., Nandan 547200, China

Abstract:Based on the time-varying parameter evolution law of rock mass mechanics, five kinds of mining sequence schemes were designed in the deep section of Gaofeng mine. The 3D finite element model with the goafs was built by the coupled modeling technique in deep mine sections. Using the FLAC3D program, the evolution laws of space and time were simulated to different mining sequences based on the time-varying mechanical parameters of rock mass. The results show that the maximum values of tensile and compressive stress reach the tensile and compressive strength of rock mass. In order to ensure safety of the mining, the goafs should be handled in time. With the mining process, the displacement increases gradually in the roof and floor. The displacement reaches the maximum in the last step. In the five cases, the maximum subsidences of the roof are 50.0, 38.0, 74.6, 64.9 and 70.5 mm, and the maximum vertical displacement of the floor is 68.6, 34.9,47.6,45.8 and 46.4 mm, respectively. The plastic failure is mainly manifested in shear and tensile failure to the rock mass. For the plastic volume, the volumes of the shear failure of cases 3 and 4 are larger than those of the cases 1, 2 and 5; the volume of the tensile failure of case 5 is the largest; the volume of case 2 is slightly more than that of case 1. For comprehensive production capacity, deformation, stress and plastic damage characteristics of stope, the case 2 is the best.

 

Key words: time-varying mechanics parameters; mining sequence; stress and displace; plastic damage; optimization

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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