摘要
基于Biot理论,采用多孔弹性介质的渗流-力学耦合模型,研究了内水压力作用下隧洞衬砌-围岩(土)相互作用问题。考虑衬砌和围岩(土)的相对渗透性,隧洞处于半封闭状态。提出采用取决于岩土介质孔隙率的应力系数来确定隧洞边界上衬砌(围岩)介质和孔隙水分别承担的内水压力值。在Laplace变换域中得到衬砌分别为柔性和刚性条件下隧洞的应力和变形解答。通过算例分析了应力系数及衬砌的相对刚度对隧洞应力和变形以及孔隙水压力场的影响。
Based on Blot's theory, the interaction of surrounding rock or soil and structure in a pressure tunnel subjected to internal water pressure is investigated by using the coupled seepage-mechanical model of porous elastic medium. Considering the relative permeability of lining and surrounding rock or soil, the tunnel is assumed to be partially sealed. So, a stress coefficient depending on the porosity of medium is proposed to determine the value of internal water pressure in medium and in pore water, respectively. The analytical solutions of stress, displacement and pore pressure are derived in Laplace transform domain with and without considering the rigidity of lining. Numerical results in time domain are obtained by Durbin's inverse Laplace transform and used to analyze the influence of stress coefficient and relative rigidity of lining and soil on stress, displacement and pore pressure.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第14期2449-2455,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
压力隧洞
相互作用
应力系数
相对刚度
Engineering geology
Laplace transforms
Seepage
Soil structure interactions
Tunnel linings
Wall rock
