土体小应变下的非线性特征试验研究

研究土体在小应变条件下的应力一应变关系特征．以标准砂和粉砂为试样，利用GDS数字应力控制三轴仪进行特殊应力路径下的固结排水试验，在试验的基础上，将Puzrin＆Burland的对数曲线型非线性模型、Goto等的正弦函数型非线性模型和传统的双曲线模型的土体应力一应变关系及弹性模量的模拟结果与试验结果进行对比．结果表明，小应变模型能够更好地反映土体在小应变下的变形特征．

Experimental study on nonlinear behavior of soils at small strains

A study was made on the stress-strain behavior of soils at small strains. With the standard sand and silty sand selected as test samples, consolidation-drained tests for special stress path were performed by use of the GDS triaxial measurement system. The comparison of the test result with the simulated results obtained by Puzrin & Burland's non-linear logarithmic curve model, the sine function nonlinear model proposed by Guto, et al, and the conventional hyperbolic model, shows that the deformation behavior of soils at small strains can be better expressed by small strain models.