摘要
基于双曲线拟合法,推导出恒载下地基沉降速率与剩余沉降之间的关系式、剩余沉降与工后沉降之间的关系式,据此建立了等载预压沉降速率标准和工程实用的卸荷时间预报方法。公式表明,沉降速率与剩余沉降的平方呈正比,工后沉降占剩余沉降的比例不仅与地基固结速率有关,而且与路面设计年限和预压时间有关,但预压时间的影响很小,沉降速率标准是所控制的工后沉降的幂函数。工程实例表明,规范和地方经验沉降速率标准适用于桥头路堤,用于一般路堤和结构物与路堤连接处过于严格。
Based on hyperbolic fitting method, two equations describing the relationship between the settlement rate and the residual settlement, and that between the residual settlement and the post-construction settlement, were established. The settlement rate standard and the unloading time prediction method under the conditions of equal loading were proposed. These formulas reveal that settlement rate was directly proportional to square of residual settlement, the ratio of post-construction settlement to the residual settlement depended on not only the consolidation rate of soil, but also the preloading duration with equal loading and the design working life of pavement, but the preloading duration had little effect on the settlement rate standard. Allowed settlement rates were a power function of the controlled post-construction settlements. An analysis of a case history showed that the settlement rate standards provided by the technical specifications and some local engineering experiences were suitable only for the embankment behind abutment, it took too long reloading time for the standards to be applied to common embankment and the embankment adjacent to structures such as culvert.
出处
《工业建筑》
CSCD
北大核心
2012年第3期93-96,共4页
Industrial Construction
基金
广东省交通科技重点资助项目(200502-01)
关键词
沉降速率标准
双曲线拟合法
等载预压
工后沉降
settlement rate standard
hyperbolic fitting method
equal preloading
post-construction settlement
