CAJ | 학술논문

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。
지하동실재폭파개알과정중유우위암사하,형성일개연개알변계배상분포적송동권。기우성파측시법,대모지하엄방일전형단면진행송동권적측시。통과통계화관찰암체성파속도적량치변화화분포규률,토론료단공여과공성파측시적우결점。결과표명,과공성파측시법수미소렬극적영향소,능교단공법경호지반영국부암체파속。분석료폭파개알삼수대측시구위암송이심도적영향,통과조정우화폭파삼수,사위암송이심도기본소우0.6 m,위암체적은정성분석、폭파삼수우화급안전가고제공료삼고의거。
In the underground cavern'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.