厦门海底隧道强风化花岗岩力学特性研究

 厦门海底隧道海域隧道地段存在多处风化深槽，岩体主要为全、强风化花岗岩。由于该类岩石强度低，压缩性高，自稳和自承能力差，在隧道衬砌结构的设计和施工工艺的选择方面会遇到一系列特殊的问题。主要通过对天然和重塑强风化花岗岩岩样进行一系列的室内试验，在掌握其基本物理力学特性的基础上，重点对其流固耦合作用下的力学特性进行研究，并建立该类强风化花岗岩的力学模型，通过反演分析对力学模型进行验证。研究成果对风化花岗岩类工程的力学参数取值有重要借鉴意义，对该类岩体中隧道的设计施工具有指导作用。

RESREACH ON MECHANICAL CHARACTERISTICS OF STRONGLY WEATHERED GRANITE FOR XIAMEN SUBSEA TUNNEL

The underwater section of the Xiamen subsea tunnel will encounter many weathered strata,and the main rock of the weathered strata is fully or strongly weathered granite. The main mechanical characteristics of this kind of rock is low strength,high compressibility;its self-stability,and its bearing capacity is low;and it brings many unexpected problems to the liner design and the tunnel construction technology. A series of laboratory tests for the strongly weathered granite have been performed to study the hydro-mechanical coupled behavior;and a new mechanical model has been suggested;and corresponding parameters have been identified by back analysis. The results obtained from the research work are useful for soft rock engineering especially for weathered granite engineering;it has guiding effect on the tunnels( design and construction in this kind of rocks.