土壤凝结剂沙障防风固沙实验研究

 在7m/s、15m/s和20m/s的实验风速下,对不同浓度土壤凝结剂处理的沙障模型进行风洞吹蚀实验。实验结果表明:抗风蚀强度以40%浓度处理最强,20%最弱,但30%浓度防风蚀效果较为实用。在乌兰布和沙漠东北缘绿洲边缘的流动沙丘,采用较为适用的30%浓度的土壤凝结剂进行1m×1m,1.5m×1.5m,2m×2m等3种不同规格沙障喷洒实验,通过对风速、粗糙度、风沙流结构特征值,以及沙障的蚀积状况进行调查,其结果表明,各种规格的沙障中,1m×1m的沙障性能最好,1.5m×15m次之,2m×2m最差。沙丘不同部位沙障的抗蚀力不同,迎风坡受损程度和风蚀率最高。

Wind Protection and Sand Fixation Effects of Soil Coagulant Sand Barrier

The wind erosion characteristics of soil coagulant sand barrier with different concentration treatments were measured under wind tunnel test in the testing wind velocity of 7.0m/s,15.0m/s and 20m/s. The results showed that the strongest wind erosion resistance was sand fixing sampling of 40% concentration treatment, and the 20% sampling treatment was worst, but 30% treatment sampling was more practical. The soil coagulant sand barriers, which consisted of 1×1m,1.5×1.5m and 2×2m etc., with 30% concentration spraying was built on shifting sand dune at brim of oasis in northeast of Wulanbuhe desert. Based on the investigation of wind velocity, roughness, structure value ( λ ) of wind sand current, erosion and deposit conditions of sand barrier, the results showed that the best ability of deposition and erosion resistance of sand barrier was 1×1m scale, 1.5×1.5m was worse, and 2×2m was the worst. The ability of erosion resistance of barrier at different parts of sand dune was different. The erosion rate and erosion degree were strongest in windward slope of dune.