摘要
边坡的破坏是一个渐进累积破坏过程,在边坡剪切带的形成过程中,土体的强度参数c,φ以不同衰减速度进行衰减,因此,c,φ应有不同的安全储备。对不同土性的软化特征进行分析,黏性土土坡随着剪切带的形成,将发生损伤软化,黏聚力c衰减远快于φ的衰减;砂性土土坡随着剪切带的形成,发生剪胀软化,φ衰减快于c衰减。根据不同衰减速度,提出了黏性土土坡按SRF2>SR F1的方式进行双安全系数分析,砂性土土坡按SRF1>SRF2方式进行双安全系数分析。同时,提出在不同土性的土坡中,c,φ按不同的方式进行配套折减,供工程界参考和讨论,以逐渐形成共识。
Slope destroy is a progressive process.During the process of formation of the shear bands,the shear strength parameters c,φ have different decay rates.So the margin of safety is different for parameters c and φ.The different softening characteristics of different soils were analyzed.The softening damage is found in the cohesive soil slope as formation of the shear bands,so the decay rate of cohesive c is more rapid than that of internal friction angleφ.The dilation and softening are disclosed in the sand soil slope,like the formation of the shear bands.The decay rate of internal friction angleφ is more rapid than that of cohesive parameter c.According to the different decay rates of parameters c,φ,the modes of SRF2 〉 SR F1 in the cohesive soil and SRF 1〉 SRF2 in the sand soil were put forward.The different modes in the different soils were discussed to offer some references to relevant studies in geotechnical engineering.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第7期1402-1407,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
损伤软化
剪胀软化
双安全系数
衰减速度
soil mechanics
damage softening
dilation and softening
two safety factors
decay rate
