摘要
为解决隧道开挖过程中临近建(构)筑物爆破震速超标、减小爆破开挖对既有建(构)筑物的影响等问题,以重庆轨道交通5号线5107标石石区间采用打设减震孔、全断面分次爆破技术的方法为例进行论述。通过现场实测震速和监控量测数据得出以下结论:隧道开挖打设减震孔、全断面分次爆破临近建(构)筑物时能够明显降低爆破震速,减小对周边建(构)筑物的影响,保证隧道开挖安全通过。根据爆破震速及监控量测数据统计,打设减震孔、全断面分次爆破能够有效的控制爆破震速。
In order to solve the problems of blasting vibration speed exceeding the standard of adjacent structures and reduce the influence of blasting excavation on existing structures in the process of tunnel excavation,water pressure blasting is adopted in the stone section of 5107 mark of Chongqing Rail Transit Line 5,the method of setting shock absorption hole and full-section sublevel blasting is discussed as an example.Based on the measured velocity and the monitoring data,the conclusions are drawn as follows:the blasting velocity can be reduced obviously when the tunnel is excavated by hydraulic blasting with shock absorption holes,and when the whole section is subdivided blasting near a building,reduce the impact on the surrounding structures to ensure safe passage through the tunnel excavation.According to the statistics of blasting vibration velocity and monitoring data,the blasting vibration velocity can be controlled effectively by setting shock absorption hole and full section blasting.
作者
沈茂盛
叶青
Shen Mao-sheng;Ye Qing
出处
《建筑技术开发》
2021年第11期79-81,共3页
Building Technology Development
关键词
地铁隧道
爆破震速
分次爆破
临近建(构)筑物
subway tunnel
blasting vibration velocity
graded blasting
adjacent structures
