中文摘要：

采用温度、吸力控制方法,试验研究了在不同温度、不同侧限约束条件下的高压实高庙子膨润土微观结构在干湿循环作用下的变化规律。结果表明,特定温度下、高吸力（〉5 MPa）范围内,干湿循环路径对无侧限、高压实膨润土集合体内孔隙与集合间孔隙的影响存在明显差异。吸湿过程中,试样内部不同孔径的孔隙均发生了不同程度的膨胀;脱湿过程中,孔隙出现分化,部分较大孔径（〉3000 nm）的孔隙收缩,而集合体内孔隙基本不受吸力增加的影响。相同侧限条件下,温度对干湿循环路径对高压实膨润土微结构的影响效果具有明显的放大作用,即温度越高、干湿循环路径对高压实膨润土微结构的影响作用越明显。

英文摘要：

With temperature and suction control,the evaluation of microstructure of densely compacted GMZ01 bentonite under different constraint conditions is conducted under wetting/drying cycles.The results indicate that for high suction（ 5 MPa）,there is a significant difference between the effects of the drying/wetting cycles on the inter-aggregate pores and the intra-aggregate pores.Following the wetting path,all the pores with different sizes expand at different levels.While following the drying process,some inter-aggregate pores with larger size（3000 nm） shrink,but the intra-aggregate pores almost do not change with the increase of suction.For confined GMZ01 bentonite specimen,when it hydrates to 5.1 MPa,the swelling of aggregates squeezes into the large pores,which causes the volume of inter-aggregate pores to reduce rapidly.However,the volume of the intra-aggregate pores almost unchanges.After that,when the specimen dehydrates to 103 MPa,the volume of intra-aggregate pores still unchanges.While the inter-aggregates pores differentiate,some of the lager pores（2000 nm） shrink into smaller pores（300 nmD700 nm）,which results in the decrease of the lager pores and the increase of the latter ones,but the increment is limited.For the same confining conditions,temperature significantly enhances the influence of wetting/drying circles on the microstructure of densely compacted bentonite,that is to say,the higher the temperature,the more obvious of the influence of the wetting/drying circles on the microstructure of the bentonite.