沙丘部位对聚乳酸纤维沙袋沙障降解速度的影响

Effects of slope position on the degradation of PLA sand barriers

掌握聚乳酸纤维沙障的降解速度对于沙障防护效益的发挥具有重要意义。在毛乌素沙地的流动沙丘迎风坡设置聚乳酸沙障,采用测定力学性能、质量损失及观察表面形态等多种手段对毛乌素沙丘迎风坡底部、中部和沙丘顶部铺设5a的聚乳酸纤维沙障的降解速度进行了研究。结果表明:与原始聚乳酸纤维沙障相比,从沙丘迎风坡底、迎风坡中到坡顶,沙障的降解速度逐渐增大。障格内纬向障体(垂直于主风向)的整体降解速度较经向障体(平行于主风向)的严重。单根沙障暴露面障体的降解速度均较贴地面的大,且二者的差异随坡位的上升越来越大。表明沙丘不同部位的风沙活动、光照、土壤水分含量等环境因素分布的差异对于聚乳酸纤维沙障降解速度有着重要的影响,在设置沙障或后期维护时应当注意加强。

The degradation degree of PLA sand barriers laid on different position of sand dunes in Mu Us Sand- land 5 years later was studied. The results showed that the degradation degree of PLA sand barriers increased from the bottom to the top of sand dunes, the degradation degree of zonal barriers was more serious than radial barriers. The degradation degree of exposure part of single sand barrier was more serious than the buried part, and the higher the slope position, the bigger the difference between the degradation of the two parts. That indi- cares the differences of wind -sand activities lead to the difference of degradation degree. sand - barriers.