摘要
乌东德水电站右岸主厂房具有高边墙大跨度特点,其中部分洞段高边墙稳定性受陡倾薄层小夹角层状岩体开挖卸荷作用影响显著。通过对陡倾小夹角层状岩体开挖后的变形破坏机制进行观察分析,揭示了控制高边墙稳定性的主要因素。进而从施工组织管理、开挖方案、爆破控制、支护优化设计、动态反馈分析等方面采取一系列措施以确保施工期小夹角洞段高边墙的稳定性。主厂房开挖期间的监测结果表明,针对小夹角洞段采取的工程措施可以有效限制围岩过量变形及开裂破坏,印证了这些措施的合理性及可靠性,同时也为类似高边墙地下洞室工程的开挖支护提供参考依据。
The main powerhouse on the right bank of Wudongde Hydropower Station has the characteristics of high side wall and large span,wherein the stability of high side wall in some tunnel sections is significantly affected by the excavation and unloading of steep dip small inclined angle stratified rock mass.The main factors controlling the stability of the high side wall are revealed by observing and analyzing the deformation and failure mechanism after steep dip small inclined angle stratified rock mass excavation.In addition,a series of measures are adopted from the aspects of construction organization management,excavation scheme,blasting control,support optimization design,dynamic feedback analysis,etc.,thereby ensuring the stability of small included angle tunnel section high side wall during the construction period.The monitoring result during excavation of the main powerhouse shows that the engineering measures adopted in the small included angle tunnel section can effectively limit the excessive deformation and crack damage of the surrounding rock,thereby demonstrating the reasonability an reliability of the measures,and providing reference for excavation support of similar high side wall underground cavern projects.
作者
颜其林
蒋业龙
YAN Qilin;JIANG Yelong(China Three Gorges Corporation,Beijing 100038,China;Anhui Yangtze River-Huaihe River Diversion Group Co.,Ltd.,Hefei 230000,China)
出处
《水利建设与管理》
2022年第2期19-26,共8页
Water Conservancy Construction and Management
关键词
层状岩体
陡倾薄层小夹角
地下洞室
高边墙
工程对策
乌东德水电站
stratified rock mass
steep dip thin layer small included angle
underground cavern
high side wall
engineering countermeasures
Wudongde hydropower station
