基于Verhulst模型的堆载预压法卸载时机的研究  

Study on Determining the Unloading Time of Surcharge Preloading by Using Verhulst Model

作　　者：余湘娟[1,2] 陈智慧 刘锋 高磊[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]岩土工程研究所,南京210098 [3]中国电力顾问集团中南电力设计院,武汉430071

出　　处：《科学技术与工程》2014年第11期57-60,共4页Science Technology and Engineering

基　　金：河海大学中央高校基本科研业务费专项资金项目(2012B02314);中国博士后科学基金资助项目(2012M511193);江苏省博士后科研资助计划项目(1102073C);高等学校博士学科点专项科研基金(20120094120015)资助

摘　　要：在公路建设中堆载预压法是处理软土地基的常用方法。工程实践中随着对路基的工后沉降和不均匀沉降要求越来越高,有必要对堆载预压处理软土地基的卸载时机控制进行研究。应用Verhulst模型和指数曲线模型的基本公式,分别推导其剩余沉降和沉降速率之间的关系。结合越南河内-海防高速公路软基处理的实测资料,用两种模型拟合了剩余沉降和沉降速率之间的关系曲线图,比较分析了两种模型曲线拟合的结果。论证得出Verhulst模型更合理,并根据拟合曲线确定了路堤卸载时机。Surcharge preloading is a common way to deal with soft soil foundation in highway construction. As the demand of postconstruction settlement and uneven settlement is higher and higher, it is necessary to have a re search on the unloading time when using surcharge preloading to treat soft soil foundation. The relationship between settlement rate and residual settlement is derived by applying the basic formula of the Verhulst model and exponen tial curve model respectively. Combining with the monitoring data of HanoiHaiphong express way in Vietnam, the curves between settlement rate and residual settlement are fitted by two models. It comes to the conclusion that Ver hulst model fits more rationally by analyzing the results. The unloading time of embankment is defined due to the fitting curves.

关 键 词：VERHULST模型 越南公路 卸载时机 沉降速率 剩余沉降 

分 类 号：TU433[建筑科学—岩土工程]