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为研究结构性软粘土在先动后静荷载作用下的力学响应特性,利用动静扭剪仪对天津滨海结构性软粘土进行了不同动应力幅值和波形的循环荷载作用,当动力累积塑性应变达到不同控制值后,再对土样进行静力三轴剪切试验。试验结果表明,在循环荷载作用下,累积塑性变形不断增大,土体结构破损加剧,随着先期动应力幅值和累积塑性应变的增大;之后,静力三轴应力应变关系曲线由应变软化型逐渐变为硬化型,其区分界限(1.25%)即为结构屈服应变;以结构屈服应变为分界点,相同围压下静力破坏应力随累积塑性应变的增大呈先快后缓的下降趋势。
In order to study the mechanical response of structural soft clay under first-mover and second-mover load, cyclic loading of different dynamic stress amplitude and waveform of Tianjin coastal soft clay was carried out by using static and dynamic torsional shear instrument. When dynamic cumulative plastic strain After reaching different control values, the soil samples were subjected to static triaxial shear test. The experimental results show that under the cyclic loading, the cumulative plastic deformation increases and the soil structure is damaged more and more. With the increase of the initial dynamic stress amplitude and cumulative plastic strain, the static triaxial stress-strain curve is determined by the strain Softening type gradually become hardening type, the distinction between the limit (1.25%) is the structural yield strain; structural yield strain as the cut-off point, the same confining pressure static failure stress increases with the cumulative plastic strain was first and then slow Downtrend.