摘要
高填方地基的填方体量大、填方高度高的特征决定了高填方地基具有较大的工后沉降,可能会影响工程的实际应用,研究高填方地基工后沉降的计算方法对于控制工后沉降具有重要意义。蠕变沉降是高填方地基工后沉降的重要组成部分,试验表明,土的蠕变变形主要受时间和应力历史等因素影响。基于考虑时间效应的统一硬化模型,以瞬时正常压缩线为参考线,引入弹性瞬时压缩线,建立了可以同时考虑时间和应力历史影响的高填方地基一维蠕变沉降计算方法,并对室内试验进行了计算,计算结果与试验结果基本一致。所建计算方法所用参数除一个参数外其余都为常见参数,而新参数可以通过常规试验确定,该计算方法便于工程应用。
The large quantity and high filled embankment makes the post-construction settlement very obvious, which influences the operation of the engineering. It is significant to study the method for calculating the post-construction settlement of high filled embankment in order to control the post-construction settlement. The creep deformation is an important component of the post-construction settlement of high filled embankment. Experimental results indicate that the creep deformation of high filled embankment is affected by both time and stress history. A method for calculating creep deformation that can consider stress history is proposed by combining the instantaneous elastic compression line and the framework of the time-dependent unified hardening model. Afterwards, the calculation results are the same as the results of the laboratory creep tests. Besides, the parameters used in the new calculation method are easily to be determined.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2015年第S1期154-158,共5页
Rock and Soil Mechanics
基金
国家重点基础研究发展计划项目(973计划)(No.2014CB047001)
国家自然科学基金(No.11272031)
北京市自然科学基金(No.8132042)
关键词
高填方地基
沉降
蠕变
high filled embankment
settlement
creep
