摘要
由于上海轨道交通四号线海伦路站隧道周围软土在地铁行车荷载作用下产生变形,使隧道发生局部开裂、渗水而需要对地铁隧道进行加固处理。通过上海地铁4号线海伦路站附近隧道周围加固软粘土进行应力控制的循环三轴试验,研究了地铁行车荷载作用下加固软粘土的动孔压发展情况,充分考虑了土体围压、固结比、轴向循环荷载的大小及频率对动孔压的影响。研究结果认为,其他条件相同时,加固软粘土孔压随振动次数、循环荷载幅值的增大而增大,随围压和加载频率的增大而减小,可以用二次对数关系曲线对加固软粘土残余孔压变化进行预测。
Because of the deformation resulted from the vibrational loading around the tunnel near the Hailun road station of Line 4 of Shanghai Metro,the phenomenon of partial cracks and water penetration occurred seriously.Through the dynamic triaxial tests under controlling the stress of reinforced soft clay obtained from the soil around the tunnel near the Hailun road station of Line 4 of Shanghai Metro,the laws of dynamic pore pressure by vibrational loading of subway were analyzed by taking into account of the influence of the confined pressure,consolidation ratio,cyclic loading amplitudes and vibration frequency.The results show that the pore pressure of reinforced soft clay increased with the increase of cyclic number and cyclic loading amplitudes while decreased with the increase of confined pressure and vibration frequency under the same circumstance.Also,the laws of residual pore pressure of reinforced soft clay could be forecasted by quadratic logarithmic relationship curve model.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2011年第1期188-194,共7页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(40872178)
上海市重点学科(地质工程)建设项目(B308)
关键词
地铁行车荷载
荷载
加固软粘土
GDS动三轴试验
孔压
subway vibrational loading； loading； reinforced soft clay； GDS dynamic triaxial test； pore pressure
