交通荷载作用下层状地基沉降简化分析方法

Settlement Analysis of Layered Foundation under Vehicle Loads

基于层状地基的应力和位移场基本解,建立了层状地基表面作用静荷载时的应力和位移的解答,对分析过程中含有O(1/r)和O(1/r2)的奇异积分作了妥善地处理,提高了计算结果的精度。针对交通荷载作用下高速公路软土地基的变形规律,通过拟静力法将车辆动荷载简化为两种特定分布形式的静荷载。计算结果表明:传统的Boussinesq联合分层总和法在均匀地基中能得到比较准确的沉降值,但在层状地基中计算得到的沉降值误差比较大。并以上海标准层状地基为例,针对不同荷载分布假设进行了沉降分析。

A new method was developed to calculate the stresses and settlements in the multilayered soft ground by using the fundamental solutions of three-dimensional multilayered solids under concentrated load.The singular integrals containing O（1 /r） and O（1 /r^2） were solved in detail in order to get high degree of accuracy.Vehicle loads can be simplified as two forms of equivalent static loads based on the characteristics of settlements in the soft ground under vehicle loads.By comparing the results of the homogeneous and heterogeneous soft ground,the conventional methods using the Boussinesq solution and layer-wise summation method can be used in homogeneous ground,but not suit for the multilayered soft ground.Based on the layered foundation in Shanghai and two forms of equivalent static loads,the settlement analysis of the foundation was carried out.