光面与预裂爆破对隧道围岩损伤的试验研究

为了研究光面与预裂爆破在隧道开挖中对围岩的影响,利用爆破振动监测、谱分析及声波检测技术,并结合现场试验与数据拟合,对比分析了这两种爆破方法对围岩影响的大小。结果表明:预裂爆破在隧道内虽然存在减振作用,但成缝对于围岩的损伤要大于光面爆破。所提出的测试方法和检测项目科学可靠,可为实际工程确定爆破方法和爆破参数提供科学依据。

TEST STUDY ON DAMAGE OF SURROUNDING ROCK FROM SMOOTH AND PRESPLIT BLASTING

To study the effect of smooth and presplit blasting on surrounding rocks in the tunnel excavation,the effect size of this two blasting methods on surrounding rocks was analyzed by using the technology of monitoring blasting vibration,spectrum analysis and ultrasonic measurement and analyzing data from the field test.The results indicated presplit blasting had vibration isolation effect,but damage of surrounding rocks by using it was more than using smooth blasting.The proposed test methods and detection projects are scientific and reliable,which can provide scientific foundation for confirming blasting methods and blasting parameters in actual blasting projects.