爆破振动在层状岩体中的衰减特性试验研究

Experimental Study on the Attenuation Characteristic of Blasting Vibration in Stratified Rock Masses

结合某滨海引水渠工程案例,采用现场爆破试验与爆破振动测试相结合的方法,获得了层状岩体场地条件下爆破振动沿不同路径的传播与衰减特征。结果表明:在层状岩体中,沿地层走向传播的爆破振动速度衰减最慢,垂直地层走向传播的衰减最快;对于本场地的陡倾角地层,穿越地层层理后的垂直向振动速度值小于同位置的水平切向振动速度值;另外,根据临近被保护物的振动速度控制要求和场地的各向异性振动传播特征,提出了采用分区爆破设计施工的振动控制措施,有效地保证了临近建筑物的安全和项目的整体建设工期。爆破振动危害的测试分析方法及成果可为类似工程案例的研究和施工提供借鉴与参考。

Combining on-site blasting experiment with blasting vibration test, the characteristics of propagation and attenuation of the blasting vibration under the stratified rock masses were obtained. The results showed that the vibration velocity attenuated lowest along the direction of the formation, and the fast in the vertical direction. For the steep dip layer in this site, the vertical vibration velocity was larger than the horizontal after going through the bedding. Furthermore, based on the requirement of vibration velocity near the protected building and the characteristics of anisotropic propagation, the control measures of partition blasting and excavation were proposed. It has effectively ensured the safety of the building and the construction period of the project. The analysis methods and resultsof blasting vibration test can provide a useful and important reference for the similar construction cases.