Deformation Properties of Frozen Sand During Loading and Unloading in the Presence of a Thermal Gradient
Deformation Properties of Frozen Sand During Loading and Unloading in the Presence of a Thermal Gradient
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发表时间：
2010
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通讯作者：
Li Sheng-sheng
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作者：
Li Sheng-sheng
在四个温度梯度的作用下，对冻砂进行了三轴加载和卸载。在冻结之前，沙子经历了K0固结。研究了梯度对应力应变的影响。初始切向泊松比增大，冻结砂的最大体积收缩减小。加载和卸载过程中的体积应变是砂土中温度梯度的函数。收缩的速度和大小取决于温度梯度和应力路径。随着温度的升高，体积不断膨胀。卸载减少了体积收缩，但增加了径向变形的变化。这验证了加载强度大于卸载强度。
Frozen sand was subjected to triaxial loading and unloading in the presence of four temperature gradients. The sand had undergone K0 consolidation before being frozen. The effect of the gradient on stress and strain was investigated. The initial tangential Poisson's ratio increases and the maximum volume contraction of the frozen sand is reduced due to the gradient. Volume strain during loading and unloading is presented as a function of temperature gradient in the sand. The rate and magnitude of contraction vary depending upon thermal gradient and stress path. As temperature increases the volume exhibits continuous expansion. Unloading reduces volume contraction but increases the variation in radial deformation. This verifies that loading strength is greater than unloading strength.