爆破开挖过程中厂房围岩松动圈测试与分析  

Test and analysis of loose circle of powerhouse's surrounding rock in blasting excavation

作　　者：张新辉[1] 尹健民[1] 任贤斌[1] 

机构地区：[1]长江科学院岩基研究所,湖北武汉430010

出　　处：《人民长江》2015年第11期36-39,共4页Yangtze River

基　　金：国家重点基础研究发展计划"973"项目(2011CB710603)

摘　　要：地下洞室在爆破开挖过程中由于围岩卸荷,形成一个沿开挖边界环状分布的松动圈。基于声波测试法,对某地下厂房一典型断面进行松动圈的测试。通过统计和观察岩体声波速度的量值变化和分布规律,讨论了单孔与跨孔声波测试的优缺点。结果表明,跨孔声波测试法受微小裂隙的影响小,能较单孔法更好地反映局部岩体波速。分析了爆破开挖参数对测试区围岩松弛深度的影响,通过调整优化爆破参数,使围岩松弛深度基本小于0.6 m,为岩体的稳定性分析、爆破参数优化及安全加固提供了参考依据。In the underground cavern＆#39;s excavation, blasting will bring about unloading on the surrounding rock and form a loose circle in annular distribution along the excavation border. Based on sonic wave testing, the loose circle of a typical cross section in an underground powerhouse was tested. By counting and observing the quantitative changes and distribution law of the acoustic velocity of rock mass, we discussed the advantages and disadvantages of sound wave test in single-hole and cross-hole respec-tively. It demonstrates that the wave test in cross-hole test could better reflect the rock wave velocity than that in single-hole test, as the influence of micro fissures of rock is smaller. Also we analyzed the impact of blasting excavation on relaxation depth of rock mass in the test areas, and successfully controlled the relaxation depth less than 0. 6m by optimizing the blasting parame-ters, thus providing basis for stability analysis of rock mass, optimization of blasting parameter and safety strengthening in rock excavation construction.

关 键 词：松动圈 声波测试 松弛深度 爆破参数 爆破开挖 

分 类 号：TV542[水利工程—水利水电工程]