大洞径隧洞钻爆法开挖松动圈超声波长观孔检测应用实例  

An Example of Detection by Ultrasonic Wave Through Long-term Observation Hole in Loose Ring of Large-Diameter Tunnel Excavated by Drilling and Basting Method

作　　者：李平宏[1] 陈宗刚[1] 薛有平[1] 李洪[1] 

机构地区：[1]中国水电顾问集团西北勘测设计研究院工程物探研究所,兰州730050

出　　处：《西北水电》2012年第3期9-12,共4页Northwest Hydropower

摘　　要：隧洞围岩松动圈是分析隧道稳定性、进行支护结构设计的一个重要因素。通过对水电施工阶段特长、特大引水隧洞开挖后,采用超声波测试技术对隧道的围岩松动圈长期观测孔的检测应用典型实例,分析松动圈的深度范围及随时间的变化机理,为设计人员对施工设计方案的优化及后期施工方案的制定,提供依据和指导。The loose ring of surrounding rock in tunnel is one important factor for tunnel stability analysis and support structural design. Through typical example of application of long-term observation hole in loose ring of surrounding rock inspected by ultrasonic wave technolo- gy, depth of the loose ring and its change mechanism with time are analyzed, providing the designer with basis and guidance for optimization of construction scheme design and sequent construction scheme.

关 键 词：围岩 松动圈 超声波 松弛深度 长观孔 

分 类 号：TV554.1[水利工程—水利水电工程] TV698.15