海边山坡场地爆破地震波的衰减测试与分析

Test and Analysis of Attenuation of Blasting Vibration at Hillside Field Near Coast

根据经验公式估算爆破引起的质点振动,对于不同的场地系数K和衰减系数α取值存在较大的计算偏差。为克服这一问题,通过对一实际场地爆破工程的现场测试,取得了该场地不同距离处的质点振动速度和主振频率,在比较分析实测结果与计算结果的基础上,采用最小二乘原理对场地参数和衰减指数进行了回归统计,得到了场地的衰减指数及场地常数。通过工程实例说明,现场测试及回归统计方法是获取爆破地震波的衰减规律的有效手段。

The inappropriate location coefficient K and attenuation coefficient α will cause an obvious deviation when calculating the ground vibration in blasting engineering based on the empirical formula. In this paper,through testing a blasting engineering at a hillside field near coast,the ground vibration and the dominant vibration frequency at different distances were obtained. Compared the result of testing and empirical calculation,K and α were acquired by using the least-square regression. The engineering practice demonstrates that the least-square regression is effective in analysis of the blasting vibration attenuation.