CAJ | 학술논문

在强降雨入渗条件下,浅层边坡土体中的气体可能被封闭,孔隙气压力在封闭条件下随着雨水的入渗不断增加.结合湿润峰面受力分析对封闭气体压力的物理意义进行了说明,通过考虑简化的气阻入渗模型,对比经典的Green-Ampt入渗模型,研究了气压对入渗率和下移的湿润峰的影响.应用该入渗模型,对下部为基岩的大面积浅层边坡雨水入渗过程以及边坡稳定性进行分析.研究表明,封闭气压显著降低了边坡体内雨水的入渗率,对安全系数的降低具有明显的延时性,这进一步揭示了部分地区雨后滑坡频繁发生的重要原因.因此,考虑封闭气压对大面积边坡降雨安全预报具有重要意义.
재강강우입삼조건하,천층변파토체중적기체가능피봉폐,공극기압력재봉폐조건하수착우수적입삼불단증가.결합습윤봉면수력분석대봉폐기체압력적물리의의진행료설명,통과고필간화적기조입삼모형,대비경전적Green-Ampt입삼모형,연구료기압대입삼솔화하이적습윤봉적영향.응용해입삼모형,대하부위기암적대면적천층변파우수입삼과정이급변파은정성진행분석.연구표명,봉폐기압현저강저료변파체내우수적입삼솔,대안전계수적강저구유명현적연시성,저진일보게시료부분지구우후활파빈번발생적중요원인.인차,고필봉폐기압대대면적변파강우안전예보구유중요의의.
@@@@Under the intense rainfall infiltration, the air in the shallow slope is likely to be confined, and the pore air pressure in air-confining condition increases constantly as the infiltration of rainfall. The physical meaning of the air-closing pressure is illustrated through the force analysis of the wetting front. Compared with the classical Green-Ampt infiltration model, the simplified infiltration model considering the air pressure is used to study the effects of air pressure on the infiltration rate and the moving wetting front. Then the infiltration process and stability analysis of a large area of shallow slope with bedrock beneath is studied through the simplified infiltration model. The results show that the air pressure in the air-confining condition reduces the infiltration rate and the safety factor remarkably, which could also reveal the reason that why some areas had frequent landslides after the rainfall. So considering air pressure for landslide forecasting is greatly significant.