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采用K0固结,负荷冻结,加、卸荷的方法,进行了4种不同温度梯度冻结中砂的三轴试验,获得了温度梯度和加、卸荷过程对冻结中砂变形演变的影响规律.结果表明:温度梯度的存在增大了冻结中砂起始切线泊松比,抑制了冻结中砂最大体缩量;不同温度冻结中砂加、卸荷过程中均呈现出体缩—体胀趋势,但不同温度梯度以及加、卸荷条件下的体缩速率和最大体缩量差异很大,且随温度梯度增加,体缩—体胀规律逐渐向持续体胀演变;卸荷过程增大了径向变形演化速率,抑制了冻结中砂体缩的发展,这一规律能合理解释加荷过程中获得的冻土强度高于卸荷过程的基本结论.
The K3 consolidation, load freezing, loading and unloading methods were used to carry out the triaxial tests of four kinds of frozen sand in different temperature gradients. The influences of temperature gradient and loading and unloading processes on the deformation of frozen sand were obtained. The results show that the presence of temperature gradient increases the Poisson’s ratio at the initial tangent of the frozen sand and restrains the maximum shrinkage of the frozen sand. The shrinkage-body expansion tendency , But different temperature gradient and under the conditions of loading and unloading, the body shrinkage rate and the maximum body shrinkage vary greatly, and with the increase of temperature gradient, the body shrinkage-body swelling gradually evolves to body weight expansion; the unloading process increases The radial deformation evolution rate restrains the development of sand body shrinkage during freezing. This law can reasonably explain the basic conclusion that the strength of frozen soil obtained during loading is higher than the unloading process.