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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (6): 771-779.doi: 10.11872/j.issn.1005-2518.2018.06.771

• • 上一篇    下一篇

诱导巷道的围岩松动破坏区数值研究

陈冲(),李夕兵,冯帆   

  1. 1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2017-06-14 修回日期:2017-08-30 出版日期:2018-12-31 发布日期:2019-01-24
  • 作者简介:陈冲(1989-),男,安徽宿州人,硕士研究生,从事采矿与岩石力学研究工作。
  • 基金资助:
    国家重点研发计划“深部岩体力学与开采理论”(编号:2016YFC0600706)资助

Numerical Study on Damage Zones of the Induced Roadway Surrounding Rock

Chong CHEN(),Xibing LI,Fan FENG   

  1. 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2017-06-14 Revised:2017-08-30 Online:2018-12-31 Published:2019-01-24

摘要:

当前多数矿山已进入深部开采,而深部硬岩具有高储能、受扰动易破坏的特征,根据这些特点,在矿体中布置巷道诱导岩体破裂,为后续机械开采提供可能。以贵州开阳磷矿为工程背景,利用FLAC3D软件模拟深部巷道开挖,研究断面形状、地应力水平和侧压系数对巷道开挖的影响,从而得出岩体的破裂规律。数值模拟结果表明:巷道断面形状对围岩变形影响较大,而矩形巷道周围岩体产生的位移和塑性破坏区均最大;巷道位移和塑性破坏区随应力水平的增加而增大;围岩破坏和位移随侧压系数的增大表现出先减小后增大的趋势。在高应力水平和高侧压系数下,采用矩形断面方式开挖巷道,围岩产生的位移和塑性破坏区最大,致裂效果最好,有利于机械切割回采。

关键词: 诱导致裂, 开挖断面, 应力水平, 侧压系数, 数值模拟, 巷道开挖, 深部开采, 开阳磷矿

Abstract:

With more mines into deep mining,hard rock in high geo-stress shows high energy storage and generates fractures easily by disturbances, and also roadway excavation accelerate surrounding rock cracking or even broken,so the fracturing rock can be cutting by mechanical tools.Those characters make it possible to operate continuous mechanized mining in the hard-rock ore-body.In this paper,Guizhou Kaiyang phosphate mine is chosen as an engineering background,the simulations of the roadway excavation damaging process were conducted by FLAC3D,and the displacement and plastic damage zone of surrounding rock of three shape roadway section were studied.The results show that the damage scale of the rectangular section is maximum,as well as the displacement,and that the displacement damage zone scale of surrounding rock increase apparently with the geo-stress levels increasing.The failure and displacement of surrounding rock decrease first and then increase with the increasing of lateral pressure coefficient.In the high stress level and high lateral pressure coefficient conditions,the surrounding rock of rectangular section tunnel excavation has a greater displacement and larger plastic failure zone,and the fracturing effect are optimum.These results present a theoretical basis for the layout and the design of induced roadway and illustrate subsequent fracturing rock can be cut by mechanical tools.

Key words: induced fracture, excavation section, stress level, lateral pressure coefficient, numerical simulation, tunnel excavation, deep mining, Kaiyang phosphate mine

中图分类号: 

  • TD853

图 1

诱导巷道的布置示意图"

图2

松动圈示意图[14] "

表1

矿体物理力学参数"

参数 数值 参数 数值
弹性模量E/GPa 25 密度ρ/(kg·m-3) 2 760
泊松比ν 0.22 黏聚力c/MPa 1
摩擦角φ/( o) 30 抗拉强度σt /MPa 3

图 3

计算模型(以圆形断面为例)"

图 4

数值模型计算流程图"

图 5

不同断面巷道的位移与塑性区分布"

图6

不同应力水平下巷道的位移与塑性区分布"

图7

不同侧压系数下巷道的位移与塑性区分布"

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