降雨作用下砾石土斜坡坡面形态及临界特性

砾石土因其级配宽、不均匀系数大、透水性强等特点在工程防渗中得到广泛的应用，其强度和力学性质受粗细粒含量和粒间咬合程度、黏接状态等影响。通过人工降雨原型试验、模型试验、室内试验及理论分析，研究松散砾石土斜坡在降雨作用下坡面土体的形态特征和土体性状的变化以及斜坡稳定性和该过程中可能出现的临界状态，探索坡面松散砾石土触变液化的过程和机理。试验结果表明，砾石土斜坡在降雨过程中，坡面土体形态、坡面径流泥沙含量具有阶段性特性；各典型现象土体含水量分布具有区段性；土体强度和斜坡稳定性随着土体含水量的增加均存在明显的临界特征。

Gravelly soil slope surface shape and criticality under rainfall conditions

Gravelly soils are made up of gravel, cobble, sand and cohesive soils and have been widely used in engineering such as earth-rock dams impervious fillings and stub cutoff walls. Their strength and mechanical property are affected by the content and bite extent and adhesive state of coarse grains and fine particles. The gravelly soil slope shape, soil mechanical property and slope stability under rainfall conditions, are researched through artificial rainfall field experiment, model experiment, indoor test and theoretical analysis. It is found that the gravelly soil slope likely exists criticality in the course of rainfalls and mechanics of thixotropic liquefaction. Result shows that the gravelly soil slope shape and sediment charge of the runoff has the character of phase, each representative phase moisture content is confine in some extent. Gravelly soil strength and slope stability has the character of criticality along with the moisture content; the critical point exists at the moisture content of 11%.