地铁行车荷载下天津滨海软土累积变形特性试验研究

Experimental Study of Accumulative Deformation Characteristics of Tianjin Coastal Mollisol under Subway Vehicle Loading

为了解地铁行车荷载下天津滨海软土累积变形变化规律,采用室内空心圆柱测试系统GCTS,对天津滨海新区软土进行应力控制的循环振动三轴试验,模拟地铁运营荷载,研究循环振动荷载下土体累积变形与土体围压、荷载幅值以及荷载频率之间的变化规律,并探讨了不同条件下最终土体变形与各参数之间的关系.试验结果表明土体最终变形随着荷载幅值、振动频率的增加而增加,随围压值的增加而减少.

For the objective of knowing the variation law of the cumulative deformation of Tianjin coastal mollisol under subway vehicle loading,the indoor hollow cylinder testing system GCTS is adopted;the stress control circulation vibration triaxial experiments on mollisol in Tianjin coastal new area is conducted;the subway operation load is simulated;the variation law of the accumulative deformation of soil mass under circulation vibration load,confining pressure of soil mass,loading amplitude and vibration frequency are researched;the relationship between the final deformation of soil mass and the parameters under different conditions is discussed. The experimental results show that the final deformation of soil mass increases along with the increase of load amplitude and vibration frequency,and decreases along with the increase of confining pressure.