基于最大主应力判据的深埋巷道岩爆预测  

Rockburst Prediction Based on the Maximum Principal Stress Criterion in Deep Roadway

作　　者：肖繁[1] 李刚[1] 胡明兵[1] 张亮[1] 赵奎[1] 

机构地区：[1]江西理工大学省矿业工程重点实验室,江西赣州341000

出　　处：《中国钨业》2016年第1期35-41,共7页China Tungsten Industry

基　　金：江西省研究生创新专项资金项目(YC2014-S350)

摘　　要：岩爆是开采深部矿床常遇到的难题,会对矿山企业造成巨大的损失。为了预测深部矿床围岩的岩爆活动,文章针对某金属矿深埋巷道开挖工程,首先通过室内岩石力学试验获取多个围岩岩爆倾向性指标值,并以有效冲击能量指标W为主,其他指标为辅,判定矿区各围岩的岩爆倾向。在此基础上,依据基于最大主应力的岩爆判别准则,对不同深度的大理岩和花岗闪长斑岩两种围岩的巷道开挖进行了数值模拟计算,由此判定了巷道周边各部位的岩爆等级。结果表明：该矿区埋深为450~1 050 m的两种围岩巷道不同部位,开挖完成后均可能出现中等至高等的岩爆活动,各部位的岩爆等级排序为底板两侧〉巷道两帮〉拱顶内缘;埋深情况相同的两种围岩巷道,花岗闪长斑岩巷道发生岩爆的等级更高。该研究结果为深埋巷道的开挖及制定合理的岩爆预防措施提供了依据。Rockburst is a frequent challenge that is faced in deep deposit mining,it has caused huge losses for mining enterprises.In order to predict the rockburst in deep deposit rock,this paper intends to research deep roadways in a metal mine where rockburst may occur after excavation.Firstly,several rockburst proneness indexes of surrounding rocks are obtained by indoor rock mechanics tests,and so all kinds of surrounding rock＇ rockburst proneness are judged by taking the impact energy index W as the major index coupled with other indexes.Then numerical simulation is conducted for the excavation of two kinds of surroundings rock＇ roadways at different depth on the basis of criterion for rockburst based on the maximum principal stress which is improved by TAO Zhenyu.The results of numerical simulation show that medium and high rockbursts may happen in these two kinds of roadways buried at a depth between 450 m and 1 050 m.Each parts of roadway where rockburst may occur are graded by the rockburst levels.Rockburst in roadway＇s sides is higher than inner edge of vault,and lower than both sides of roadway floor.Besides,under the same burying condition, rockburst which occurs in granodioritic porphyre roadway is apt to be strong.These conclusions provide evidence for deep roadways＇ excavation and taking reasonable preventive measures to rockburst.

关 键 词：岩爆 深埋巷道 岩爆倾向性 最大主应力 数值模拟 

分 类 号：TD315[矿业工程—矿井建设]