摘要
在海水渗流的情况下,考虑隧道围岩屈服后强度衰减(塑性软化)的特点,用弹性-塑性软化-塑性残余三线性应力-应变模型推导出了海底隧道围岩塑性软化区半径、塑性残余区半径、洞周边位移、围岩内任一点应力及围岩压力的解析表达式,并与仅考虑渗流及渗流和软化皆不考虑的其他两种情况进行了对比,研究表明:在渗流和材料软化中,后者对隧道围岩稳定最为不利。分析了不同软化程度对结果的影响,该结果为海底隧道围岩稳定性分析等方面提供了理论依据。
Under the condition of seawater seepage and by considering the behaviors of strength reduction for surrounding rock after yielding, that is plastic-softening, the analytical equations for calculating the radius of plastic-softening and plasto-residual zones as well as the displacements around openings are proposed according to the elastic-softening- residual plastic triple linear stress strain model. By comparing with other two situations, one is considered seepage only, the other one is considered non-seepage and non-softening, it demonstrates softening is more disadvantaged to the stability of surrounding rocks. The influences of different softening extents on the results are also analyzed. The results provide a theory base for stability analysis of surrounding rocks and engineering practice in subsea tunnels.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第11期3267-3272,共6页
Rock and Soil Mechanics
基金
国家863基金资助项目(No.2007AA11Z134)
关键词
海底隧道
围岩
渗流
应变软化
subsea tunnel
surrounding rocks
seepage
strain-softening
