不同加载速率下花岗岩巷道岩爆破坏特征研究  

Study on the Damage Characteristics of Rock Burst at Granite Drift Under Different Loading Rates

作　　者：孙林 杨震[1,2] 田宝柱 刘志超[1,2] 李昆 

机构地区：[1]华北理工大学矿业工程学院,河北唐山市063009 [2]河北省矿业开发与安全技术重点实验室,河北唐山市063009

出　　处：《矿业研究与开发》2017年第9期44-49,共6页Mining Research and Development

基　　金：国家自然科学基金资助项目(51374088);河北省人才工程培养经费资助科研项目(A201500504);河北省高等学校科学技术研究项目(QN2016125;QN2016124)

摘　　要：采用双轴伺服实验机开展不同加载速率下花岗岩巷道岩爆模拟实验,分别采用红外热像技术和岩石颗粒筛分方法获取花岗岩巷道岩爆岩石碎屑温度和不同粒度等级岩屑质量,重点研究速率效应影响下巷道岩爆岩石碎屑温度变化特征和碎屑粒度-质量分布规律,揭示不同加载速率条件下的巷道岩爆破坏特征。研究结果表明:随着加载速率的增加,花岗岩巷道岩爆产生的岩石碎屑温度随之升高、质量随之增大,说明加载速率的增加促进了巷道围岩损伤破坏;随着加载速率增大,微粒岩屑质量占比保持不变,细粒岩屑和中粒岩屑质量占比随之减小,粗粒岩屑质量占比随之增大,说明加载速率增大,岩爆过程中用于切割岩块的能量占比减小,转化为其他形式的能量占比增大。The simulation experiments on rock burst at granite drift under different loading rates were conducted by biaxial servotesting machine. The rock temperature of rock burst at granite drift was obtained by infrared thermal imaging technology androck particle sieving method, as well as the debris weight in different granularity levels. The temperature variation characteris-tics of rock debris from rock burst, and the distribution law of granularity and weight was mainly studied under the influence ofloading rates. Finally the damage characteristics of rock burst at granite drift was revealed. The results showed that with theincrease of loading rates, the rock temperature and debris weight of rock burst a-t granite drift both improved, which indicatedthat the increase of loading rates promoted the damage of surrounding rock. Under the same condition, the weight proportion ofparticulate debris kept the same, the weight proportion of fine debris and medium-grained debris reduced and the weight pro-portion of coarse debris increased, which indicated that the energy proportion for cutting rock during rock burst declined withthe increase of loading rates, and the energy proportion of other forms increased.

关 键 词：花岗岩 加载速率 岩爆 破坏特征 

分 类 号：TD324[矿业工程—矿井建设]