The hydro-mechanical behaviour of a reconstituted unsaturated soil under different suctions and strain rates was studied through various rate-controlled unsaturated/undrained triaxial tests. The fully saturated reconstituted specimens were desaturated to four different initial suctions (s₀ = 0, 100 kPa, 200 kPa and 300 kPa) and then triaxially sheared (conventional triaxial compression) at three different strain rates in undrained conditions (\(\dot{\varepsilon }_{1} = 0.001\) h⁻¹, 0.01 h⁻¹, and 0.1 h⁻¹). The observed hydro-mechanical behaviour during shearing including the volumetric strain, deviatoric stress, degree of saturation and suction is presented and discussed in this paper. The results indicate that when the strain rate rises at the given initial suctions (or pore water pressures), the maximum deviatoric stress (q_max), critical net stress ratio (M) and critical state suction (s_c) increase but the degree of saturation (S_rc) and volumetric strain at the critical state (ε^c_v ) reduce. The critical effective stress ratio (M′) is not dependent on the strain rate for saturated and unsaturated samples. The critical state lines for unsaturated soils with the constant strain rates are parallel with each other in the e − lnp′ space.

通过各种速率控制的不饱和/不排水三轴试验研究了不同吸力和应变速率下的再生不饱和土的水力力学行为。将完全饱和的重组试样去饱和至四个不同的初始吸力（s ₀  = 0、100 kPa，200 kPa和300 kPa），然后在不排水条件下以三种不同的应变率进行三轴剪切（常规三轴压缩）（ \ varepsilon} _ {1} = 0.001 \）  h ^-1，0.01 h ^-1和0.1 h ^-1）。本文介绍并讨论了在剪切过程中观察到的流体力学行为，包括体积应变，偏应力，饱和度和吸力。结果表明，在给定的初始吸力（或孔隙水压力）下应变率升高时，最大偏应力（q _max），临界净应力比（M）和临界状态吸力（s _c）增加，但是饱和度（小号_RC）和体积应变在临界状态（ε ^ç _v ）减少。临界有效应力比（M′）不依赖于饱和和不饱和样品的应变率。具有恒定应变率的非饱和土壤的临界状态线在e  -ln p '空间中彼此平行。