高速公路软土路基堆载预压段沉降预测方法对比  

Comparison of settlement prediction methods for soft soil subgrade under heap load preloading

作　　者：胡其志 田锟 李鸣 HU Qizhi;TIAN Kun;LI Ming(College of Civil Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;China Communication South Road&Bridge Co.,Ltd.,Beijing 101149,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]中交路桥南方工程有限公司,北京101149

出　　处：《中国科技论文》2019年第10期1111-1116,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51609081)

摘　　要：采用堆载预压技术处理软土地基时,预压段的沉降发生及发展规律对路面施工质量有重要影响。以武穴长江公路大桥北岸接线段软基处理工程为例,基于堆载预压后长期跟踪的沉降观测数据,分别通过指数曲线法和双曲线法对预压路段进行沉降预测,并利用控制变量法分析采用数据时间的长短、沉降预测初始点的设定、采用2次数据的时间间隔等3个因素对2种预测结果的影响。结果表明:采用数据时间的长短对2种方法的预测结果影响均较大,其中采用较长时间沉降数据的预测结果更为准确;沉降预测初始点的设定对于指数曲线法的预测结果影响较小,而对于双曲线法的预测结果影响很大;采用两次数据的时间间隔对于2种方法的预测结果影响均不明显。The settlement and development law of the preloading section have important influence on the pavement construction quality when the preloading technology is used to treat the soft soil foundation.Taking the soft foundation treatment project of Wuxue Yangtze River highway bridge on the north bank as an example,based on the settlement observation data of long-term tracking after the stacking preloading,the settlement prediction of the preloading section was carried out by using the exponential curve method and hyperbolic curve method respectively.The control variable method was used to analyze the influence of three factors,such as the length of data used,the setting of initial point of sedimentation prediction,and the time interval between data used,on the two kinds of prediction results.The results show that the length of data time has great influence on the prediction results of the two methods.The prediction result is more accurate by using long time settlement data.The setting of initial point of settlement prediction has little influence on the prediction result of exponential curve method,but has great influence on the prediction result of hyperbolic method.The time interval of two data is not significant for the prediction results of the two methods.

关 键 词：堆载预压 沉降预测 控制变量法 指数曲线法 双曲线法 

分 类 号：U416.12[交通运输工程—道路与铁道工程] TU196.2[建筑科学—建筑理论]