狮子坪水电站厂房交通洞覆盖层成洞条件及处理措施

Tunneling Conditions and Treatment Measures through Overburden in Access Tunnel to Powerhouse at Shiziping Hydropower Station

狮子坪水电站厂房交通洞覆盖层组成物质大小悬殊,分布不均匀,结构松散且夹有大量孤石,具架空结构,成洞条件极差。对厂房交通洞覆盖层的性状、成因及成洞施工方法、主要问题及处理措施进行了分析。

The access tunnel to powerhouse at Shiziping hydropower station has a poor tunneling conditions because the overburden has such characteristics : the heterogeneity of the particle,the nonuniformity of the distribution,the uneven of the structure,containing a plenty of boulders and space frame.Therefore,the properties,the cause and construction methods,the major problems and the treatment measures of the overburden at the access tunnel to powerhouse are discussed.