摘要
平面应变状态下被动方向的主应力完全取决于土的本构关系,并不总是中主应力,在不同条件下可能为小主应力、中主应力或者大主应力。平面应变状态的主应力对土体强度和变形计算均有重要影响。在使用弹性模型计算高填方土体沉降时,泊松比决定了被动方向主应力的大小,对沉降计算影响很大;由于变形模量通常与小主应力有关,计算变形量时必须首先搞清楚不同工况下,被动方向的主应力到底是大主应力、中主应力还是小主应力,然后才能正确地确定相应的模型参数,进行计算和分析。
The principal stress in passive direction is entirely determined by the constitutive relationship of soil, which may be the major, intermediate or minor principal stress in different conditions. The stress has the significant effect on the strength and deformation of soil in plane strain state. Poisson＇s ratio determines the value of the principal stress in passive direction, which influences greatly on the settlement calculation for high fill. Because the modulus of deformation are often relevant to the minor principal stress, it is necessary to determine the principal stress in passive direction which may be the major, intermediate or minor one in different cases for engineering practice. Then the parameters of the model could correctly be obtained for calculation and analysis.
出处
《工程勘察》
CSCD
北大核心
2007年第4期1-3,共3页
Geotechnical Investigation & Surveying
基金
国家自然科学基金(50279014)
关键词
平面应变
主应力
变形计算
泊松比
plane strain
principal stress
deformation calculation
Poisson＇s ratio
