摘要
木里沙湾水电站引水隧洞岩性以薄层状千枚岩、板岩等软岩为主,挤压揉皱强烈,断层构造较发育,地下水丰富,围岩为Ⅳ、Ⅴ类,根据实际地质条件,把Ⅳ类围岩分为基本稳定的Ⅳ1类、稳定性差的Ⅳ2类,Ⅴ类为不稳定。在施工过程中,根据其特点采取不同的施工工艺。对已产生塌方的洞段根据地质条件、塌体规模、塌腔高度及形态等采取了相应的施工技术措施,确保了工程顺利进行。
Shawan hydropower station is located in Muli County.The surrounding rocks in headrace tunnel area are mostly composed of thinly foliated phyllite and slate,strongly squeezed and folded,with fault developed and rich underground water.The surrounding rocks are classified as IV and V.According to site geological conditions,surrounding rock IV are classified as IV1(basically stable) and IV2(poor stability) and rock V is unstable.During construction,different construction techniques are adopted based on rock features.In tunnel sections where collapse occurred,corresponding construction engineering measures were taken according to geological conditions,rockfall mass volume,collapse cave height and shape so as to ensure the project to succeed.
出处
《四川水力发电》
2010年第3期15-19,共5页
Sichuan Hydropower
关键词
隧洞
软岩
特性分析
施工方法
塌方处理
沙湾水电站
tunnel
surrounding rocks
weak rock
feature
analysis
construction method
collapse treatment
Shawan hydropower station
