工程弃土土壤侵蚀人工模拟降雨试验研究

在测定弃土粒径组成及含水量的基础上，用14．10 Pocket Vane Tester型三头抗剪仪对试验区土壤抗剪强度进行了测定；用人工模拟降雨的方法，对原地貌、新近堆土和堆积1年的弃土做了土壤侵蚀特征研究。结果表明：①有植被保护的原地貌产流时间滞后于弃土近1h，弃土产沙量达到0．927kg，是原地貌的2．06倍。②在场降雨过程中，弃土产流量是原地貌产流量的1．21倍，径流系数分别为：原地貌0．12，弃土0．62；弃土产沙远远多于原地貌，初始合沙量：原地貌〈弃土，分别为24kg／m^3，145kg／m^3，并且随着产流量的增加而增加。③随着弃土堆积时间的加长，抗剪强度不断增大，弃土细粒含量降低，含水量反而增大。

Research on the Simulated Rainfall Experiment for the Soil Erosion by the Project Spoil

On the basis on measurement of gradation composition and water content of waste spoil,it is used the 14.10 Pocket Vane Tester Type of triple shearing instrument to measure the shearing strength of the soil at the experimental area.Using the method of artificial simulation rainfall,the research was conducted to the soil erosion features on the original landform,newly accumulated soil and waste spoil for one year,respectively.The result shows that i) the producing runoff time at the protected landform is one ...