朱彦鹏++蔡文霄++杨校辉

摘要：通过单点沉降现场实测数据对软土地区兰永一级公路高填方路堤沉降规律进行分析，建立了指数模型、乘幂模型、双曲线模型、对数模型4种沉降预测模型，并将这4种模型的预测值和实测值进行对比，在此基础上，利用最小二乘法建立了指数与双曲线模型的组合模型。结果表明：4种模型中指数模型和双曲线模型的预测精度相对较高，利用指数与双曲线组合模型得到的预测曲线与实测曲线吻合良好，使误差平方和减小到22.789 mm2，能够满足工程要求；高填方路堤工后沉降在730 d左右的时间内基本完成，预测最终沉降量为60.44 mm。

关键词：单点沉降计；高填方路堤；预测模型；工后沉降；组合模型

中图分类号：TU447文献标志码：A

Field Test of High Embankment Settlement ModelZHU Yanpeng1，2， CAI Wenxiao1，2， YANG Xiaohui1，2

（1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province， Lanzhou

University of Technology，Lanzhou 730050， Gansu， China； 2. Western Engineering Research Center of

Disaster Mitigation in Civil Engineering of Ministry of Education， Lanzhou University of Technology，

Lanzhou， 730050， Gansu， China）Abstract： The settlement laws of high embankment on LanzhouYongjing expressway in soft soil area were analyzed through insite measuring data by single point settlement gauge. Four kinds of settlement forecasting models including exponential model， power model， hyperbolic model and logarithmic model were established and the forecasting values and measuring values of settlements were compared. Based on this， combination model of index model and hyperbolic model was established. The results show that exponential model and hyperbolic model are relatively accurate in the four kinds of models， the forecasting curves of combination model of index model and hyperbolic model agreed with the measuring curves， and the error sum of squares is 22.789 mm2， which satisfy the need of engineering， the postconstruction settlement of high embankment will finish within about 730 d， the forecasting final settlement is 60.44 mm.

Key words： single point settlement gauge； high embankment； prediction model； postconstruction settlement； combination model

0引言

隨着中国高等级公路建设的需求增多，越来越多的高填方路堤应用到公路建设中，而建设高填方公路不可避免地要面临路堤沉降问题。近年来，科研技术人员为解决这个问题做了部分研究工作，目前预测路堤最终沉降和工后沉降主要有分层总和法、数值计算法、实测沉降资料预测法。土体是一种复杂的工程材料，试验得到的土体参数是比较离散的，而需要大量试验来获取尽可能接近实际参数的分层总和法和数值计算法显示出局限性，依据现场实测沉降资料的预测法就显示出独有的优势，它是在对实测数据分析的基础上做出的预测，能考虑诸多因素对土体沉降的影响，预测结果与实际情况往往吻合较好[1]。……