中文摘要：

将采自汶川震区滑坡堆积体的土石混合物分别过2mm,7mm筛网,留取粒径〈2mm的土壤和2-7mm的碎石,按质量重新配成全土,石土比1∶3,1∶2,1∶1的土石混合体,在不同坡度、不同流量条件下进行室内冲刷试验,由此探究土壤侵蚀率与水力学参数的关系。结果表明：全土条件下,坡面土壤侵蚀率随流速增加而减小,而含碎石条件下的总体趋势则表现为土壤侵蚀率随流速增加而增大;冲刷试验水流雷诺数均远大于500;除石土比1∶2条件下的冲刷外,全土,1∶3,1∶1条件下坡面土壤侵蚀率均与水深、雷诺数呈正相关;全土及石土比1∶1条件下的坡面土壤侵蚀率随弗汝德数的增大而减小,其他条件下的冲刷结果反之;土壤侵蚀率与阻力系数、曼宁系数的拟合性,除了全土条件下的拟合性较好外,其他条件下的冲刷拟合性稍差,其中规律性不强。本研究旨在运用室内冲刷试验,在不同流量、不同坡度、不同石土比条件下,建立土壤侵蚀率与水力学参数的关系,为今后对汶川震区滑坡堆积体的深入研究提供参考依据。

英文摘要：

The indoor experiments begun with sieving mixed earth-rock collected from Wenchuan landslide deposit.The diameter of earth was less than 2mm,and that of rock was 2-7mm.There were four ratios of mixed earth-rock in accordance with the quality,earth,and rock to earth 1∶3,1∶2,and 1∶1.The purpose of this paper was to explore the relationship between soil erosion rates and hydraulics parameters on earth-rock mixed steep slope with scouring flow method under different gradients and flows.The results showed that soil erosion rate decreased with the increasing of flow velocity during flowing earth,and the result of flowing earth-rock was on the contrary.All of the Reynolds numbers were more than 500.Except earth-rock（1∶2）,erosion rate increased with the increasing of Reynolds numbers and depth of water.The erosion rate of flowing earth and earth-rock（1∶1）decreased with the increasing of Froude number.The simulation fittings among soil erosion rates and Darcy-Weisbach coefficient and Manning coefficient of flowing earth were best.The study would provide a reference basis on the earth-rock mixed landslide slope in Wenchuan earthquake area.