摘要
以福建标准砂为试验材料,主要研究了不同应力状态下不同应力增量方向对砂土材料塑性应变增量方向的影响及其原因。试验结果表明,随着应力增量方向角增大,塑性应变增量方向角逆时针旋转,但两个角度不重合;应力状态越高,砂土剪胀所对应的应力增量方向角范围越大,塑性应变增量方向角范围越小,并得到砂土处于临界状态时仍有塑性体积应变产生的结论。分别从平均应力增量、广义剪应力增量以及应力状态三个角度阐述了砂土的塑性流动机理,为砂土塑性应变增量方向的相关研究提供理论参考及数值支撑。
Taking the standard sand of Fujian as the test material,the influence of different stress increment directions on the direction of plastic strain increment of sand materials were studied under different stress states and its reasons. The test results show that the plastic strain increment angle rotates counterclockwise with the increase of stress increment direction angle,but the two angles do not coincide;the higher the stress state,the larger the stress increment direction angle range corresponding to sand dilatation,the smaller the plastic strain increment direction angle range,and the plastic volumetric strain still increases in critical state. The plastic flow mechanism of sand was expounded from three aspects of average stress increment,generalized shear stress increment and stress state,which provides theoretical reference and numerical support for the related research of sand plastic strain increment direction.
作者
郭云鹏
戚承志
马超
卢真辉
孙友杰
Guo Yunpeng;Qi Chengzhi;Ma Chao;Lu Zhenhui;Sun Youjie(Beijing Advanced Innovation Center for Future Urban Design,School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《建筑结构》
CSCD
北大核心
2018年第S2期930-934,共5页
Building Structure
基金
国家自然科学基金(51478027)
973重大项目子课题(2015CB57805)
大土木与地下建筑工程长江学者和创新团队发展计划资助(IRT_17R06)
关键词
砂土
塑性应变增量方向
应力增量方向
应力状态
sand
plastic strain increment direction
stress increment direction
stress state
