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通过对我国西部2种典型非饱和路基边坡实施现场人工降雨的监测结果表明,随着各次降雨的依次进行,非饱和路基边坡初始含水量逐渐增大,入渗率逐渐减小;非饱和黄土路基边坡的初始含水量状态对应着一个临界降雨量,只有降雨量超过该临界值,边坡才有可能产生径流。降雨强度越大,从降雨开始到径流产生所需的间隔时间越短;非饱和黄土路基边坡的吸力值远大于非饱和土石混合土路基边坡。在试验条件下,压实黄土路基边坡的降雨入渗影响深度在0.3~0.6 m之间,而土石混合土路基边坡降雨入渗影响深度在2.4 m以上。
The monitoring results of on-site artificial rainfall on two typical unsaturated embankment slopes in western China show that the initial water content of unsaturated embankment slope gradually increases and the infiltration rate decreases with each successive rainfall; The initial water content of saturated loess subgrade slope corresponds to a critical rainfall, and the runoff is likely to occur only when the rainfall exceeds this critical value. The greater the rainfall intensity, the shorter the time interval from the beginning of rainfall to the runoff. The suction value of unsaturated loess slope is much larger than that of unsaturated soil-rock mixed soil subgrade slope. Under the experimental conditions, the depth of rainfall infiltration affects the slope of compacted loess roadbed between 0.3 and 0.6 m, while the influence of rainfall and infiltration on the slope of soil-rock mixed soil subgrade is above 2.4 m.