中文摘要：

对饱和哈尔滨黏土进行7次冻融循环后,在不同围压和应变速率下进行固结不排水三轴剪切试验,分析融化饱和黏土的有效偏应力及孔隙水压力随应变速率的发展规律。结果表明,融化饱和哈尔滨黏土在小于240 kPa的围压下表现出超固结特性,在240 kPa围压下表现为正常固结或者轻度超固结特性。随着应变速率的增大,融化哈尔滨黏土的强度变化规律以0.15 h^-1为节点分为2个阶段：当应变速率小于0.15 h^-1时,试件的强度随着速率的增大先增大后减小,当应变速率超过0.15 h^-1时,试件的强度随着速率的增大持续增大;孔隙水压力的发展趋势随着围压的增大由软化型转变为硬化型,但各围压下的应变速率效应对孔隙水压力的发展趋势影响不明确;利用广义双曲线模型对试验数据进行分析拟合,研究表明,该模型能够合理的描述融化哈尔滨黏土的应变速率效应。

英文摘要：

Consolidated-undrained triaxial shear tests were conducted at different strain rates and confining pressures to study the effects of strain rates on the effective deviatoric stress and pore water pressure of thawed saturated Harbin clay（TSHC）. The results show that the thawed saturated Harbin clay presents an overconsolidation characteristic when the confining pressure is less than 240 kPa, and normally or slightly over-consolidation characteristic under the confining pressure of 240 kPa. The strength of thawed saturated Harbin clay increases first and then decreases with the increase of the strain rate below 0.15 h^-1,but continuously increase when the strain rate exceeds 0.15 h^-1. The characteristics of pore water pressure-strain curves change from the softening type to the hardening type when the confining pressure increases,but the influence of strain rate effects on the development of pore water pressure is unclear. In addition,it was found that the generalized hyperbolic model described nicely the strain rate effects of thawed saturated Harbin clay.