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为研究循环荷载作用后原状土与重塑土不排水强度发展规律,针对天津典型粉质黏土做了一系列动、静力三轴试验。结果表明,振后原状土样不排水抗剪强度会发生衰减,当振后轴向应变大于3%时,衰减度β随动轴向应变增加呈现先增大后稳定的趋势;最大孔压比处于0.5～0.7之间时,不排水强度衰减较小,最大孔压比高于0.7时,振后强度开始迅速衰减;振后饱和粉质黏土不排水剪应力路径表现出超固结性质,随着β的增加,应力路径由正常固结向轻似超固结,再向重似超固结发展。对于重塑土,循环荷载作用后其不排水抗剪强度变化较小。
In order to study the development of undrained strength of undisturbed soil and remolded soil after cyclic loading, a series of dynamic and static triaxial tests were carried out for typical silty clay in Tianjin. The results show that undrained shear strength of undisturbed undisturbed soil samples will decay. When the axial strain after vibration is greater than 3%, the attenuation β increases with the increase of axial strain and then increases first and then stabilizes. The maximum pore pressure ratio When 0.5 ~ 0.7, the undrained strength decay is small. When the maximum pore pressure ratio is higher than 0.7, the vibration strength begins to decay rapidly. The undrained shear stress path of the saturated silty clay shows the overconsolidation property with The increase of β, the stress path from the normal consolidation to slightly over-consolidation, and then to the development of similar super-consolidation. For remolded soil, undrained shear strength changes slightly after cyclic loading.