软土工后沉降双曲线模型与指数曲线模型分析  

Analysis on hyperbolic model and exponential model for post-construction settlement of soft soil

作　　者：王伟[1] 宰金珉[2] 卢廷浩[3] 

机构地区：[1]绍兴文理学院土木工程系,浙江绍兴312000 [2]南京工业大学岩土工程研究所,江苏南京210009 [3]河海大学岩土工程研究所,江苏南京210098

出　　处：《江苏大学学报（自然科学版）》2008年第2期173-176,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50278042);国家自然科学基金资助项目(50478005)

摘　　要：分析软土工后沉降的典型预测模型,指出了预测误差的原因.阐明双曲线模型只是基于模型曲线与实测沉降形状相似的基础上提出的,没有理论依据;指数曲线模型主要基于太沙基一维固结理论,模型假定与工程实际有较大出入,所以两者具有较大的拟合误差.从数学角度证明了在初始沉降速率和最终沉降分别相同的情况下,指数模型预测结果大于双曲线模型的预测结果.沉降预测工程实例进一步证明了数学分析的正确性.讨论了理想工后沉降模型应具备的数学性质.Typical prediction models of the post-construction settlement and their deficiencies are analyzed. Exponential settlement model is used on the basis of one-dimension Terzaghi consolidation theory ; but field engineering can not satisfy the theory＇s postulates. So hyperbolic model and exponential model have considerable predicting errors. Mathematic proof shows that the value of exponential model is greater than the corresponding value of hyperbolic model under the conditions of the same initial settlement rates and the same final settlements. The mathematical conclusion is confirmed by the settlement predictions of one case history. Finally, mathematical property of ideal post-construction settlement model is discussed.

关 键 词：沉降 双曲线模型 指数曲线模型 初始沉降速率 最终沉降 

分 类 号：TU443[建筑科学—岩土工程]