龙滩水电站地下厂房开挖爆破损伤范围评价.pdfVIP

第1 4卷 第2期 工程爆破 Vo1．14．No．2 2 0 0 8年 6月 ENGINEERING BLASTING June 2008 文章编号：1006—7051(2008)O2—0001—07 龙滩水电站地下厂房开挖爆破损伤范围评价 张文煊 ，卢文波。 (1．中国科学技术大学，合肥 230026；2．长江科学院，武汉430010；3．武汉大学，武汉430072) 摘 要：无论采取何种爆破技术，爆破对开挖轮廓线以外的保留岩体仍然存在不同程度的损伤，确定 这一损伤范围具有十分重大的工程意义。本文分析比较了实际工程中应用较广的几种爆破损伤确定方 法，指出了质点峰值振动速度方法确定岩石爆破损伤的优越性；导出了基于质点峰值振动速度的岩石爆 破中岩体损伤范围的计算式，并利用该方法得到了龙滩地下厂房开挖过程爆破对边墙保留岩的损伤范 围。计算结果证明实际工程所采用的保护层厚度和钻爆参数的合理性，这也从侧面证明了本文所采用 的方法的有效性。 关键词：龙滩水电站；开挖爆破；质点峰值振动速度；损伤范围 中圈分类号：0319．56 文献标识码：A EVALUATION OF BLAST—INDUCED DAMAGE ZONE IN EXCAVATION BLASTING OF LONGTAN UNDERGROUND WORKSHOP ZHANG W n一．Tcuan ”，L【，W n一60。 (1．University of Science and Technology of China，Hefei 230026，China； 2．TheChangJiang River Scientific Research Insititute，Wuhan 430010，China； 3．Wuhan University，Wuhan 430072，China) ABSTRACT．．The damage induced by blast always existing no matter what kind of blasting technique is a— dopted，SO the study to the damage zone is very important to blasting excavation．Several kinds of methods for calculating the damage zone induced by blast in rock mass are studied in this paper，the result indicates that the peak particle velocity method has preponderance in all kinds of methods usually used．An equation to calculate the damage zone caused by blast in rock mass is educed．With this equation，the blast-induced damage zone of Longtan underground workshop is calculated，which proves the rationalities of the thick- ness of protective layer and the blast parameters adopted by the project，and also confirms the validity of the method advised in this paper． KEY WORDS：Longtan Hydroelectric Station；Excavation blasting；Peak particle velocity；damage zone