Wind Tunnel Test on Sand-preventing Mechanism of Soil Coagulant Sand-barrier

The model was designed with 1:10 scale, and the testing wind velocity consist of 7.0m/s,15.0m/s and 20m/s. The erosion-deposition characteristic of soil coagulant sand-barrier with different concentration treatment was measured under wind tunnel test. The results were as follows: The biggest intensity of erosion resistance was sand-fixing sampling of 40% concentration , and the treatment of 20% was the worst, but treatment of 30% was more practical. The relation between the deposition feature and concentration was not obvious. The sand-barrier of the most deposition was 1×1m scale among different scales sand-barrier either in horizon or in 30° slope, the more was 1.5×1.5m, and 2×2m was the least. The wind speed decreased gradually resulted from the stopping function of the barriers before and after the barriers, Then the wind speeds up gradually when it flowed to the barriers, and reaches the maximum over the middle checker(second checker) board, and then decreased.The flow trended to stable after 10 times sand-barriers height. The wind speed decrease resulted to the sands deposition in front of and behind barriers, and was the sand-preventing mechanism of the soil coagulant checker barriers.