中文摘要：

在实际土工抗震边值问题中,饱和砂土在许多情况下并非处于完全不排水条件,可能由于土性等因素的不同而出现各异的排渗条件。排水条件对土体的动力应力应变响应有较大影响,本文基于新开发的孔隙水注入控制系统,进行了循环剪切条件下饱和砂土吸水试验,研究了剪切吸水对土体动力特性的影响规律。通过试验发现：剪切吸水条件下砂土的抗液化强度较不排水条件下降低,同样的循环剪切条件下轴向应变发展更大;试样的抗液化强度降低和轴向应变增加程度随剪切吸水率的增大而增加。基于对饱和砂土体变规律的已有研究,本文初步解释了剪切吸水条件下饱和砂土应力应变特性规律的物理实质。

英文摘要：

In many cases of boundary value problems in geotechnical earthquake engineering, saturated sand is not in a completely undrained condition; it may behave as in different drainage conditions due to the factors, such as soil properties or different level types. In order to study the influence of drainage conditions, water absorption tests of saturated sand under cyclic shearing were carried out using pore water injection control system, which was newly developed with the help of cyclic triaxial devices. It is found that the cyclic resistance or cyclic strength of specimens decreases because of water absorption, while the axial strain is enlarged for same cyclic shearing history. The liquefaction strength diminishes and the axial strain enlarges significantly with the increase of water absorption rate. Finally, the mechanism of stress-strain characteristics of saturated sand under water absorption shearing is revealed on the basis of test results and prior study of sand deformation.