摘要
N-J水电站工程地处喜马拉雅山南麓,电站引水隧洞埋深大、地质条件复杂。其引水隧洞的某双线洞段采用2台开敞式TBM掘进,因遭遇剪切破碎带、软弱围岩、地下渗水的共同作用,在掘进过程中围岩发生较大规模塌方,出现卡机事故。通过对该洞段地质条件的综合分析,有针对性地提出了在护盾顶部人工开挖小导洞的脱困方案,最终使TBM顺利脱困。为TBM在类似不良地质围岩洞段的施工提供了宝贵经验。
The Neelum - Jhelum Hydropower Station with deep - buried water intake tunnel in Pakistan is located at the south piedmont of Himalayas, which is confronted with adverse geological condition. Two sets of open - type TBM were adopted to ex- cavate a double - tunnel section of the water intake tunnel. Under co - influences of shear - fracture zone, soft rock mass and groundwater seepage, rock mass collapsed during the excavation and further caused a TBM jam accident. Through comprehensive analysis on the geological condition of this tunnel section, accordingly, we propose a jam -removing solution that is excavating a small pilot tunnel at the top of TBM shield. The jam - removing technique was verified effectively by the engineering practice, thus gaining valuable experiences for TBM construction in similar adverse geological strata.
出处
《人民长江》
北大核心
2014年第3期66-69,共4页
Yangtze River
关键词
TBM卡机
超前地质预报
脱困方案
巴基斯坦N-J水电站
TBM jam
advanced geological probing
jam -removing solution
Neelum -Jhelum Hydropower Station
