摘要
土石混填路基变形模量和孔隙率随荷载增加而发生变化,土石颗粒受载前后体积不变,基于上述特点,建立了集中荷载作用下土石混填路基孔隙率和变形模量的变化模型,引进分级加载的思想和基于集中荷载作用于半无限空间的布辛奈斯克理论,建立了可考虑土石混填路基变形模量与孔隙率变化影响的路基表面竖向位移计算模型,利用土石混填路基表面静载试验曲线及曲线拟合方法确定了土石混填路基初始孔隙率,建立了土石混填路基压实度检测新方法.结合某工程实例进行测试结果对比分析,结果表明:新方法与传统方法测试结果吻合,能加快测试速度,降低对路基的破坏程度.
The deformation modulus and the porosity ratio of soil-took mixture roadbed change with the increase of load, and the total volume of the soil and the rock in soil-took mixture roadbed before and after the action of concentrated load never changes under the action of load. In view of these characteristics, a model describing the porosity ratio and deformation modulus of soil-rock mixture roadbed was developed. An idea of step-by-step loading and the Boussinesq＇s theory about semi-infinite space under concentrated load were introduced, and then a calculating rnodd of the vertical settlement was established, which could reflect the effect of the change of porosity ratio and deformation modulus. A method for determining the initial porosity ratio of soil-rock mixture roadbed was presented based on the static load test curves and their fitting method. Finally, a new technique detecting the compactness of soil-rock mixture roadbed was developed. Moreover, the measured results from an engineering case were used to make a comparative analysis, which showed that the results of the new method agreed with those of traditional methods. It could improve the testing speed and reduce the extent of the failure of the roadbed.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第2期22-26,共5页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(50578060)
湖南省自然科学基金资助项目(03JJY5024)
关键词
路基
土石混填
孔隙率
压实度
静载试验
变形模量
roadbeds
soil-rock mixture
porosity ratio
compactness
static load test
deformation modulus
