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一、概述土的单向压缩试验,是在保持侧向应变为零的条件下对试样施加轴向压力,因此,变形是一维的。试验结果可以得到在总应力条件下,单向压缩的应力—应变关系及“静止侧压力系数”,并可计算泊松比、有侧限体积压缩模量及回弹模量。同时还提出了应力—应变关系的拟合和计算参数,经验证明计算值与实测值较近。该试验具有方法简单直观,便于操作,且加、卸载无滞后现象。
1. Overview The uniaxial compression test of soil is to apply axial pressure to the sample while maintaining the lateral strain to zero. Therefore, the deformation is one-dimensional. The test results can be obtained under the stress conditions, the unidirectional compression stress-strain relationship and “static side pressure coefficient”, and can calculate the Poisson’s ratio, the volume compression modulus and the elastic modulus of the confinement. At the same time, the fitting and calculation parameters of the stress-strain relationship are also proposed. Experience shows that the calculated value is close to the measured value. The test has a simple and intuitive method, is easy to operate, and there is no hysteresis between loading and unloading.