节理岩体边坡爆破振动衰减特征分析

遵义市南部新区新龙快线项目中,岩体节理裂隙较为发育,岩层产状为缓倾斜,倾角约20°,边坡的走向和结构面走向夹角较小。爆破施工时,在上覆岩体重力荷载和爆破振动荷载的共同作用下,边坡稳定性难以得到保证。为研究节理岩体边坡爆破振动速度传播规律,进而采取合理的控制措施,通过对边坡爆破振动进行监测,分析边坡爆破振动衰减特征,得到不同装药量和爆心距时爆破振动在边坡上的传播规律。研究结果表明:装药量越大,距离越小,振速衰减速度越大;振速高程放大效应效果与装药量密切相关。对监测结果进行回归分析与预测,结合研究结果最后提出合理措施。

Analysis of Blasting Vibration Attenuation Characteristics of Jointed Rock Mass Slope

In the project of Xinlong express of Zunyi South District,the rock jointing and fracture are develop-mental,with gentle-dipping rock formation,with about 20 degrees,and the angle of the strike of the slope and the strike of the structural planes are small.Under the joint action of the gravity load of the overlying rock mass and the blasting vibration load in blasting construction engineering,it is difficult to guarantee the slope stability.In order to study the propagation law of blasting vibration velocity of jointed rock slope,and then to take reasonable control measures,through monitoring the blasting vibration of the slope,analyzing the vibration attenuation characteristics of slope blasting,and under the differents of the charge quantity and the distance to blast source,the propagation law of blasting vibration on the slope is obtained.The results show that the larger the charger quantity and the smaller the distance,the greater the speed of vibration attenuation;the effect of amplification effect on vibration velocity positive elevation is closely related to the charge quantity.Regression analysis and prediction of the monitoring results,com-bined with the results of the research,put forward reasonable measures to provide the basis for the safety and efficient implementation of the project.