爆破开挖作用下HD工程地下洞室围岩动力响应特性研究  

Characteristics of Dynamic Response of Surrounding Rock Induced by Blasting Excavation in Underground Cavern of HD Project

作　　者：赵晓[1] 高志华[1] 李鹏[2] 张雨霆[2] 

机构地区：[1]武警水电三峡工程指挥部,宜昌443133 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010

出　　处：《爆破》2014年第1期55-59,共5页Blasting

基　　金：国家自然科学基金(51309026)

摘　　要：地下洞室爆破开挖有可能会对开挖洞室本身和邻近洞室产生不利影响,故有必要研究爆破作用下地下洞室围岩动力响应特性,以便于对地下洞室的开挖进行安全评价。结合HD工程地下洞室爆破开挖实例,对实测爆破振动数据进行分析,从中选取合适的数据对爆破荷载进行反演,并采用FLAC 3D数值计算软件对爆破开挖作用下地下洞室围岩动力响应进行模拟和研究。结果表明:爆破作用会对爆源近区有限范围内、有限时间段内的围岩应力及位移分布造成一定的影响,对爆源远区及邻近洞室的应力及位移分布总体规律影响并不显著;随着爆源距的增加,岩体振速峰值衰减明显,而当爆源距较大时,振速峰值衰减趋势相对平稳;相邻洞室岩体振速相对较小。Blasting excavation in underground caverns may adversely affect the excavated cavern itself and adja- cent caverns, then the dynamic response characteristics of underground cavern surrounding rock under blasting was studied to evaluate the underground cavern excavation safety. The measured blasting vibration of the underground cav- ern excavation of HD project was discussed,and some proper data was inverted to blast load parameters. Then the dy- namic response of surrounding rock induced by blasting excavation in underground cavern was simulated and studied with numerical software FLAC 3D. The results indicated that the blast made influence on the stress distribution and dis- placement in limited region and time intervals and little influence on those in far field and adjacent cavern. The decay of peak vibration velocity vs the distance from the source was put forward. The decaying speed decreased with the dis- tance increasing and the vibration velocity of adjacent cavern was much less than that of the original cavern.

关 键 词：地下洞室 爆破开挖 围岩 数值模拟 

分 类 号：TD235.1[矿业工程—矿井建设]