土石混填料纵、横波速与泊松比的相关性分析  

Correlation analysis between Poisson's ratio and velocity of longitudinal wave and shear wave in soil-stone mixture

作　　者：张宇辉[1] 张献民[1] 

机构地区：[1]中国民航大学机场学院,天津300300

出　　处：《长安大学学报（自然科学版）》2016年第1期28-35,50,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(60879021);博士科研启动项目(2012QD24x);中央高校基本科研业务费专项资金项目(3122014D028);机场工程科研基地开放基金项目(KFJJ2014JCGC06)

摘　　要：高填方土石混填地基泊松比现场测试困难,缺乏便捷准确的方法。对粉土、砂土、粘土3种土样的土石混填试件进行大型振动压实试验,分析不同含水率、不同含石量条件下,混填料的纵波波速VP、横波波速VS、纵横波速比(VP/VS)等应力波参数随混填料干密度的变化机理;研究混填料泊松比随含水率、含石量的变化规律。建立土石混填料泊松比与纵横波速比的相关分析模型,实现由混填料纵横波速比到泊松比的推定计算,并对该模型进行实验室精度验证。研究结果表明:混填料纵横波速比随干密度的增大而减小;纵横波速比曲线总体呈随含石量增大而下移、随含水率增大而上移的变化趋势;混填料泊松比-干密度曲线总体呈随含水率增大上移、随含石量增大下移的趋势;模型计算平均相对误差,砂土混填料为0.045,粉土混填料为0.042,粘土混填料为0.034,工程应用误差较小。在此基础上,提出采用应力波方法测试土石混填地基泊松比的新技术。The Poisson＇s ratio of highfill soil-stone foundation was difficult to be field tested due to the lack of convenient and accurate method. Then, large vibration compaction test of soil-stone mixture was conducted with silt soil, sandy soil and clay soil. The change mechanism of stress wave parameters including longitudinal wave velocity （Ve）, shear wave velocity （Vs）, velocity ratio of longitudinal wave to shear wave （Vp/Vs） in soil-stone mixture with different dry density of soil-stone mixture was analyzed under different water contents and different stone contents. The change rule of mixture Poisson＇s ratio with different water contents and different stone contents was studied. Analysis model of correlation between Poisson＇s ratio and Vp/Vs in mixture was built, then Poisson＇s ratio could be calculated by Vp/Vs in soil-stone mixture. Precision of the model was verified in laboratory. The results show that Vp/Vs in mixture increases with the decrease of dry density. Curves of Vp/Vs moves down with the increase of stone content but moves up with the increase of water content. Curves of Poisson＇s ratio and dry density moves up with the increase of water content but moves down with the increase of stone content; the average relative errors of the model are 0. 045 for sandy mixture, 0.042 for silt mixture and 0. 034 for clay mixture, and the engineering application errors is small. On this basis, the new technology of Poisson＇s ratio test with stress wave in soil-stone mixture is proposed. 1 tab, 7 figs, 20 refs.

关 键 词：道路工程 土石混填地基 泊松比测试 应力波 振动压实 

分 类 号：U416.6[交通运输工程—道路与铁道工程]