摘要
砾石土因其含砾、粉细砂和粘性土,具有级配宽、不均匀系数大、透水性强等特点,在土石坝防渗体土料和工程防渗墙中得到广泛应用。目前的研究多针对砾石土在工程应用方面,对于坡面松散砾石土降雨淋滤作用导致土体细粒成分流失、土体组构改变以至影响土体力学性质变化以及坡面物质稳定性变化等系列研究并不多见。利用人工降雨装置,进行了人工降雨坡面松散砾石土降雨淋滤试验,开展了砾石土侵蚀过程及其特征初步试验研究。试验表明,降雨作用下砾石土斜坡表面土体形态变化具有明显的阶段性特征,随着坡长的增加,产流率和侵蚀模数成线性增加,径流量随降雨时间跳跃和波动性增加,径流泥沙含量随降雨时间的增加以近似幂函数曲线关系递减。
Gravelly soils are made up of gravel, cobble, sand and cohesive soils. They have been widely used in engineering applications such as earth-rock dams impervious fillings and stub cutoff walls. Present researches are mainly aiming at these engineering applications; researches on fine grained soils of the loose gravelly slopes running off under rainfalls, making structures of the soils alteration and affecting their mechanical properties or even affect the slope stability, are few order to study the erosion process and features of the gravelly slope soil under rainfall conditions, this essay carried out a sort of artificial rainfall local and model experiments; and the water content and sediment content of the runoff is monitored in the experiment. Result shows that the shapes of the slope surface transformed phasicly; runoff producing rate and erosion modulus increases linearly with lengthening of slope length. Runoff quantity increases along with the time of the rainfalls with the character of hopping and fluctuating, sediment content descents adapt to the rainfall time with the character of approximate power function.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第11期1722-1726,共5页
Rock and Soil Mechanics
基金
中国科学院岩土力学重点试验室开放课题(No.Z000402)
中国科学院武汉岩土力学研究所重大探索项目(No.Q110303)资助
关键词
砾石土
人工降雨
径流量
泥沙含量
gravelly soil
artificial rainfall
runoff
sediment content
