摘要
随着城市化进程的加快,地下工程建设日益增多,爆破施工是较常见的一种施工工法,对周围建筑物和已有线路的影响较大。爆破药量、爆心距和高程差等因素的不同都会使爆破振速产生较大的差异,造成不可挽回的影响。为了优选更合理的爆破振速衰减模型对预测爆破振动效应,以青岛地铁某线施工为背景,采用多段爆破的爆破方式,设置多个监测点记录爆破振速,对比分析不同爆破振速预测模型效果和适用性,并在此基础上进行模型优化。结果表明:爆破振动在地面传播过程中空洞效应的影响较大;爆破振动效应是多种因素综合作用的结果,模型涉及因素越多,则爆破振速预测模型的结果与实测值越接近;根据空洞效应建立的分段预测模型能有效地预测爆破振动在地面的衰减规律,可被类似工程借鉴。面对复杂的爆破施工场地,应根据条件进行爆破振速衰减模型的选择。
In recent years, with the advancement of urbanization, more and more underground projects have been undertaken. As a common tunnel construction method, blasting vibration is a random, hazardous, and complex method, and it has a great impact on the surrounding buildings and existing lines. The difference of blasting vibration velocity is mainly caused by blasting charge, distance to blasting center, and elevation difference. To optimize the model of blasting vibration velocity attenuation and predict the blasting vibration effect, multi-stage blasting was adopted, and multiple monitoring points were set to record the blasting vibration speed. The effects and applicability of different models of blasting vibration velocity prediction were compared and analyzed based on the engineering background of a station in Qingdao Metro. The results show that the cavitation effect has great influence on the propagation of blasting vibration on the ground. The blasting vibration effect is influenced by many factors. The more factors involve in the model, the closer the result of the blasting vibration velocity prediction model will be to the measured values. The segmented prediction model based on cavitation effect can predicted effectively the attenuation law of ground blasting vibration. In the face of complex blasting construction site, blasting vibration velocity attenuation model should be selected according to the on-site conditions. The results provide a reference for similar projects.
作者
朱明
胡鑫涛
冯志威
张建国
司小东
亓宁
ZHU Ming;HU Xin-tao;FENG Zhi-wei;ZHANG Jian-guo;SI Xiao-dong;QI Ning(Qingdao Metro Group Corporation,Qingdao 266100,China;Shandong Zhengyuan Construction Engineering Co.Ltd.,Jinan 250101,China;CCCC Highway Consultants Co.Ltd.,Beijing 100032,China;SGIDI Engineering Consulting(Group)Co.Ltd.,Shanghai 200082,China)
出处
《科学技术与工程》
北大核心
2021年第10期4211-4218,共8页
Science Technology and Engineering
基金
国家自然科学基金(41672272)。
关键词
爆破振速衰减
模型优选
爆心距
高程差
爆破药量
vibration attenuation of blasting
model optimization
distance to blasting centers
height difference
blasting dose
