李勇泉,吴亮
LI Yong-quan1,WU Liang2(1.China Three Gorges Project Corporation

• 1:中国长江三峡开发总公司
• 2:武汉科技大学理学院

摘要(Abstract)：

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 α 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(KeyWords)： 三峡工程;地下厂房;开挖爆破;振动衰减规律
Three Gorges Project;Underground power plant;Excavation blasting;Vibration attenuation law

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李勇泉,吴亮
LI Yong-quan1,WU Liang2(1.China Three Gorges Project Corporation

参考文献(References)：

• (1)张正宇,张文煊,吴新霞,等.现代水利水电工程爆破[M].北京:中国水利水电出版社,2003.
• (2)严鹏.岩体开挖动态卸载诱发振动机理研究[D].武汉:武汉大学,2008.
• (3)张文煊,王文辉.龙滩水电站地下厂房开挖爆破震动衰减规研究[J].工程爆破,2006,12(3):11-13.
• (4)李洪涛,舒大强.爆破震动衰减规律的影响因素[J].武汉大学学报(工学版),2005,38(1):79-82.
• (5)王民寿,胡继生,杨兴国,等.小湾水电站地下厂房洞室围岩爆破震动的动力特征[J].云南水力发电,2001,17(1):35-39.