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通气条件是影响整个降雨入渗过程的重要因素之一。通过自主设计的降雨入渗试验模型、模拟降雨系统及数据自动采集系统,分别进行通气、封气条件下的人工降雨模拟试验,从而研究气相对降雨入渗的影响。对比通气和封气条件下的试验数据可知,封气条件下气体不能自由排出,对雨水下渗的阻滞作用明显,雨水入渗速率较小,坡体内饱和区变化缓慢;坡体内孔隙气压力随着降雨入渗的进行先增大后在10cm水头上下波动。研究成果为原位试验的展开及数值模拟提供了数据支撑。
Ventilation is one of the most important factors affecting the infiltration process. Through self-designed rainfall infiltration test model, simulated rainfall system and automatic data acquisition system, artificial rainfall simulations under aeration and gas sealing conditions were respectively conducted to study the effect of gas phase on rainfall infiltration. Comparing with the experimental data under aeration and gas sealing conditions, it can be seen that the gas can not be discharged freely under the condition of gas sealing, which has obvious retardation effect on the seepage of rainwater, and the infiltration rate of rainwater is small and the saturation area changes slowly. The pore pressure With the increase of rainfall infiltration, the head of 10cm fluctuated. The research results provide data support for the unfolding and numerical simulation of in situ experiments.