路基工后沉降的分段调节变维分形预测方法研究  

Study on Variable Dimension Fractal Prediction Method by Step Adjustment for Post-construction Settlement of Subgrade

作　　者：李勇直 周星德[1] 秦飞马 王露健 张翔[1] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《施工技术》2014年第5期88-91,共4页Construction Technology

基　　金：国家自然科学基金重点项目(U1134207);国家自然科学基金项目(51178160)

摘　　要：针对实际测量的沉降数据具有非等时距和变异性较大的特点,为了获取较为精确的路基沉降预测结果,提出一种分段调节变维分形预测法。首先,将实测数据分段,计算测点累计沉降的各阶分维数,通过光滑度确定分维阶数;其次,通过计算预测值及误差,确定分段值,作为分界点,建立分段变维分形模型;再次,由各段分界点及性能指标确定调节系数,用包含调节系数的有效数据点来表示预测沉降;最后,给出了一个工程实例。In view of the characteristics of unequal interval and great variability existed in measured settlement values, in order to obtain more accurate embankment settlement prediction resuhs, in this paper, a variable dimension fraetal prediction method is presented. The concrete process includes： firstly, sectioning the measured data, calculating the each order fractal dimension of the cumulated settlement of all measured points, and confirming the fitting curve by aid of the smoothness;secondly, setting up a section variable dimension fractal model through the calculation and prediction error determined the demarcation point and value of section;again, utilizing the valid data with adjustment coefficient to predict the last settlement. Finally, an engineering example is given to demonstrate the feasibility of proposed algorithm.

关 键 词：公路工程 工后沉降 调节系数 沉降 预测 

分 类 号：U213.157[交通运输工程—道路与铁道工程]