大瑶山隧道浅变质岩系围岩性态特征

The Behaviours of Light Metamorphic Surrounding Rock in Dayaoshan Tunnel

大瑶山隧道围岩大部分为浅变质碎屑岩系,分析研究其性状特征,对评价该隧道围岩的稳定性有着重要意义。本文以围岩变形量测和弹性波探测的结果为依据,论述了浅变质岩系围岩的性态特征,指出Ⅲ级以上围岩基本稳定,其变形大小,主要决定于量测断面所处的地质环境,而应力效应和洞径效应对其影响不甚明显。

The most part of the surrounding rock in Dayaoshan Tunnel is light meta-morphic detrital rock. It is significant to analyse and investigate its behavioursfor the stability of surrounding rock of the tunnel. This paper describes thebehaviours of the light metamorphic detrital rock in terms of the defor-mation and the seismic survey the measurements in rock mass, and indicates thatunder the Ⅲ grade of the rock the surrounding rock is stable, its deformationmainly depends upon the geological circumstance of the measuring section, andthe effect of the stress field and the opening size of the tunnel is not evident.