三峡地下厂房爆破开挖振动衰减规律研究  

STUDY ON THE LAW OF BLASTING VIBRATION ATTENUATION REGARDING THE EXCAVATION OF THREE GORGES UNDERGROUND POWER PLANT

作　　者：李勇泉[1] 吴亮[2] 

机构地区：[1]中国长江三峡开发总公司,湖北宜昌443002 [2]武汉科技大学理学院,武汉430081

出　　处：《工程爆破》2009年第2期7-10,51,共5页Engineering Blasting

摘　　要：基于三峡地下厂房爆破开挖实测资料,对影响爆破振动衰减规律的主要因素进行了分析。研究结果表明:夹制作用比较大的掏槽爆破近区质点振速大于崩落爆破,而振速峰值衰减较快;相对爆源不同方向的振动衰减规律也不相同,前冲向质点振动衰减指数大于侧向质点振动衰减指数;装药结构也影响爆破振动衰减规律,预裂爆破与光面爆破诱发振动衰减经验公式的K值远小于正常的梯段爆破,而其α值则比较小。预裂爆破与光面爆破的装药结构一致,因此衰减公式预测曲线衰减规律相同,但预裂爆破处于较大的夹制约束状态,其质点振动峰值大于光面爆破。Based on real measuring data on blasting excavation of Three Gorges Underground Power Plant, the paper analyzed the major factors affecting the blasting vibration attenuation and resulted in the following facts that, the particle vibration of cutting bole blasting near blasting region was larger than that resulted from caving blasting, with the blasting vibration attenuation index larger than that in caving blasting; the blasting vibration attenuations vary from their explosive sources, with the attenuation indexes of particles in front of explosive source larger than that of the particles located in side direction; and besides, the explosive structure also affected the attenuation law, meaning that the K values of presplit blasting and smoothing blasting were far smaller than that in bench blasting, and with a relative low level of a values for presplit blasting and smoothing blasting. The analysis also showed the fact that since the explosive structure was conducted in the same pattern both in presplit blasting and smoothing blasting, the attenuation formula forecast curve attenuation laws on the two ways of blasting were identical, except for that the peak particle vibration of presplit blasting was bigger than that in smoothing blasting.

关 键 词：三峡工程 地下厂房 开挖爆破 振动衰减规律 

分 类 号：TV731.6[水利工程—水利水电工程] TD235.41[矿业工程—矿井建设]