不同真空度下地表爆炸后地面振动规律研究

Law of Surface Explosion Ground Vibration under Different Vacuum Degrees

为研究真空度对爆炸引起的地面振动的影响,开展了炸药在真空爆炸容器爆炸后产生地面振动衰减规律的研究。研究爆炸振动衰减规律,进一步分析真空度对爆炸后地面振动效应的影响;同时,预判爆炸容器内不同药量爆炸时的影响距离,以确定爆炸影响范围进行防护。基于实验数据,分析了振动速度随炸药量、爆心距的衰减规律,并利用萨道夫斯基经验公式,采用最小二乘法拟合求取爆破振动参数K、α值,最终得到爆炸振动速度衰减方程,对综合情况和真空下的振动衰减曲线进行对比分析。结果表明:在爆炸容器5倍比距离下,真空度对振动速度衰减有影响;但是大于5倍比距离下,爆炸容器的真空度对振动影响很小,其远处的地基振动在相同距离下变化不大。在药量和爆心距相同的情况下,随着容器压强即真空度的增大,合速度缓慢增大,且对远距离处的振动影响很小。这是国内首次探索不同真空度下地面爆炸振动规律,并依据特定允许振动速度数值计算安全距离,可为类似研究提供借鉴。

In order to study the influence of vacuum on ground vibration caused by explosion,the attenuation law of ground vibration caused by explosion after vacuum explosive vessel is studied.The attenuation law of explosion vibration is studied,and the influence of vacuum on the ground vibration effect after explosion is further analyzed.At the same time,the influence distance of different explosive amount in the explosion container is predicted to determine the explosion influence range for protection.Based on the experimental data,the attenuation law of vibration velocity with explosive amount and the distance between testing point and charge is analyzed,and the blasting vibration parameters K、α are obtained by using the Sadowski empirical formula and the least square method.Finally,the attenuation equation of explosion vibration velocity is obtained,and the vibration attenuation curves under comprehensive condition and vacuum are compared and analyzed.The results show that the vacuum degree has an effect on the vibration velocity attenuation under the 5 times specific distance of the explosive container.However,when the specific distance is greater than 5 times the specific distance,the vacuum degree of the explosive container has little effect on the vibration,and the distant foundation vibration does not change much at the same distance.In the case of the same charge quantity and distance between testing point and charge,the resultant velocity increases slowly with the increase of container pressure,that is,the vacuum has little effect on the vibration at a long distance.This is the first time in China to explore the law of ground explosion vibration under different vacuum degrees,and the safe distance is calculated numerically according to the specific allowable vibration velocity,which can be used as a reference for similar research.