摘要
为了弄清隧洞塌拱的原因和寻找合理有效处理塌拱的工程措施,以曾达电站引水隧洞1、2号支洞施工中发生的不同程度的塌拱行为为实例,分析了地下水、岩体结构、施工因素等对塌拱的影响;进一步研究了处理和防治塌拱的施工措施和原理。研究结果表明:地下水的影响是塌拱发生的重要原因之一,岩体结构及施工因素特别是支护的时机对保护围岩的稳定性非常重要;现场采用超前小管棚预注浆与锚喷支护综合技术处理隧洞塌拱取得了良好效果。
In order to find the reason of collapse in arch and reasonable construction method to deal with collapse in arch, the influence of underground water, rock structure, construction factors on collapse in arch were analyzed, the tunnel collapse of different degree in arch during construction of the NO.1 and NO.2 sub-tunnel of the hydraulic tunnel in ZENGDA power station are taken as example. The theory and construction method to deal with and protect the tunnel collapse in arch are studied. The results show that underground water is one of the main reasons of collapse in arch and the rock structure and construction factors (especially supporting time) are very important to protect the stability of surrounding rock. On the spot, using small pile-shed forepoling with bolting and shotcreting support to deal with the tunnel collapse in arch is successful.
出处
《地下空间与工程学报》
CSCD
2005年第1期140-144,共5页
Chinese Journal of Underground Space and Engineering
关键词
引水隧洞
隧洞塌拱
地下水
岩体结构
防治措施
稳定性
围岩
锚喷支护
hydraulic tunnel
tunnel collapse in arch
underground water
structure of rock
protection of collapse in arch
