摘要
利用受恒载作用下多层地基的一维线性固结问题的解析解,给出了受循环荷载作用下单层地基考虑压缩性变化的一维固结问题的解答。单层地基被平均划分为n层,并把固结时间和荷载也相应的划分为相同的等份,这样在每一微小的时间段内土层的一维固结问题可以处理为恒载线性问题。每一层土体的压缩、回弹状态可以根据该层的有效应力加以判断,通过选择不同的压缩系数并利用现有的多层地基土的固结理论进行分析。编制了相应的计算程序,与不考虑压缩性变化的解析解进行了比较。在证明了该方法的可靠性的基础上,分析了土体受循环荷载作用下的一维固结性状,最后给出了一个工程计算实例。
Taking consideration of variable compressibility under cyclic loading, a new solution to one-dimensional consolidation is presented. In this method, the soil stratum is divided into n layers of equnal thickness the consolidation time into several intervals, and the loading into small components accordingly. The problem of one-dlmensional consolidation of soil stratum under cyclic loading, in each time interval, can then be taken as a one-dimensional consolidation of muhi-layered soils under constant loading. The compression or rebounding of each soil layer can be judged by the effective stress of the layer, thus the compressibihty can be determined and the consolidation of the layered system can be analyzed by using the existing analytical consolidation theory, which takes no consideration of variations of compressibility of soil under cyclic loading. After the feasibility of this method is proven, the behavior of one-dimensional consolidation of a soil with variable compressibility under cyclic loading is investigated in detail, and a case study is conducted.
出处
《土木工程学报》
EI
CSCD
北大核心
2005年第9期109-114,共6页
China Civil Engineering Journal
基金
国家自然科学基金项目(50079026)
国家教育部博士点专项基金项目(20030335027)
关键词
一维固结
循环荷载
压缩系数
回弹系数
one-dlmensional consolidation
cyclic loading
compressibility
resilience coefficient
