中文摘要：

长期的干湿循环作用必然会引起黄土结构的改变,从而影响其强度特性及渗透特性.通过室内三轴压缩和三轴渗透试验,得到了干湿循环作用对重塑黄土强度和渗透性的影响规律：重塑黄土的剪切强度、黏聚力c和内摩擦角φ均随着干湿循环周期的增加而衰减,且经过第1次干湿循环后衰减最大;土样初始含水率越低,干湿循环对其强度的影响越大;干湿循环达到一定次数后,土体结构会重新达到平衡,强度也将趋于稳定;渗透系数k随着干湿循环次数的增加明显增大,而且围压对渗透系数的影响很大.

英文摘要：

The soil structure changing with the alternate dry-wet affects the strength and permeability of loess.Through the indoor triaxial compression and penetration test[1],the influence of alternate dry-wet on the strength and permeability of loess was shown as follows： with the increase of dry-wet cycles,the strength,cohesion and internal friction angle of remolded loess all decreased.The reduction was the greatest at one cycle;the lower the initial water content was,the more the alternate dry-wet affected the strength;the soil structure was re-balanced,and the strength was stabilized,after a certain number of cycles of dry-wet;and the permeability coefficient increased significantly with the addition of dry-wet cycles.