裸洞隧道病害形成耦合机理分析

裸洞隧道病害的产生主要是地下应力场在损伤、渗流、温度等因素的耦合作用下形成的,是非常复杂的非线性耦合过程。从裸洞隧道开挖后的弹塑性应力场出发,使用Bui损伤模型与地下水渗流场组成的激励-反应耦合系统加以研究病害形成的耦合机理。结果表明,裸洞隧道病害明显产生是损伤和渗流耦合强度因子在0.5左右产生的,随着隧道围岩裂隙的扩展和损伤程度的加剧,围岩塑性区半径随水压力的增加而迅速增大,加速隧道病害的产生,这为探明裸洞隧道病害形成机理研究、治理与防护起到一定的理论指导意义。

Coupling Mechanism Analysis on Cavern Tunnel Disease Forming

Cavern tunnel diseases,mostly forming underground stress field under the action of damage,seepage,temperature and other factors,are very complicated nonlinear coupling process.Using the stimulate-response coupling system made up of Bui damage model and seepage field,the result shows that the diseases will be formed obviously when the coupling strength factor is about 0.5,with the cranny expanding and the damage increasing in the surrounding rock;the plastic radius of underground rock is increasing with the porous hydraulic pressure;it speeds tunnel diseases to come into being;it has some positive significance with guidance to prove up the coupling mechanism,the repair and the protection of the cavern tunnel.