摘要
现有的边界面模型多用临界状态区分松砂、密砂,但试验中,很难确定密砂的临界状态.本文以相变线(PTL)为参考线,引入以相变状态为基础的状态参量,将已有的边界面模型加以改进利用状态参量的概念,可以准确判断砂土在初始时刻和任意时刻的变形趋势,而基于状态参量的剪胀比在相变点处仍等于零.无论是松砂还是密砂,或砂土从一种状态到另一种状态,基于状态参量的剪胀都能真实的模拟砂土的反应.研究结果表明,利用本文的模型参量得到的密砂三轴排水试验,模拟结果与试验结果相吻合,较好地反映了砂土的力学特征.
In this paper,an existing bounding-surface is modified and a state parameter based on phase transformation state is introduced.The deformation tendency of a sand at any time or any conditions can be judged correctly by state parameter.As a result,the dilatancy depends on the state in a way that yields a zero value at phase transformation state.This dependence allows a realistic modelling of the response of a sand in either loose or dense state,or in the transition from one state to another state.A comparison between model simulations and a sequence of experimental results for drained,monotonic loading conditions shows that the simulation results are consistent with the test results,which can better reflect the mechanics characteristics of sandy soil.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2014年第1期99-102,共4页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
国家自然科学基金资助项目(51278047)
关键词
饱和砂土
剪胀性
相变线
状态参量
saturated sands
dilatancy
phase transformation line
state parameter
