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寻找经济高效的固沙措施对于防治风沙危害具有重要意义。该文采用室内风洞试验,研究了不同粉煤灰施用率(10%,20%和30%)的固沙效果及在粉煤灰最佳施用率的基础上不同聚丙烯酰胺(PAM)施用率(0.05%和0.1%)对其的强化作用。试验研究结果表明,沙土施加粉煤灰后起动风速显著提高,施加PAM进一步小幅提高其起动风速;粉煤灰施用率为20%的沙土可以最有效地抵御8m/s净风和风沙流历时10min的吹蚀;施加粉煤灰的沙土在14m/s净风和风沙流历时10min的吹蚀条件下发生中度风蚀,其风蚀率随着粉煤灰施用率的增大而呈逐步降低的趋势;施加粉煤灰和PAM的沙土可以有效地抵御14m/s风沙流历时30min的吹蚀;从经济意义上考虑,推荐粉煤灰施用率为20%和PAM施用率为0.05%的用量水平处理用于风蚀防治。
Finding cost-effective sand-fixing measures is of great importance to the prevention and control of wind-sand damage. In this paper, the indoor wind tunnel test was used to study the effects of different fly ash application rates (10%, 20% and 30%) on the sand fixation effect and on the basis of the optimal application rate of fly ash, different PAM application rates (0.05% and 0.1%) on its strengthening effect. The experimental results show that the starting wind speed increases significantly after the application of fly ash, and the application of PAM further increases the starting wind speed slightly. The sand with fly ash application rate of 20% can most effectively resist the wind and sand flow of 8m / s for 10min The wind erosion rate of moderately wind erosion occurred when the fly ash applied sand blown at 14m / s net wind and sand flow lasted 10min, and the wind erosion rate gradually decreased with the increase of fly ash application rate ; Applying sand with fly ash and PAM can effectively resist the blown sand flow of 14m / s for 30min; from the economical point of view, it is recommended that the application rate of fly ash is 20% and the rate of PAM application is 0.05% For wind erosion control.