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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。
Pozzolana high embankment filling site than on-site testing difficulties, the lack of convenient and accurate method. Large-scale vibratory compaction tests were carried out on the soil-stone mixed samples of silt, sand and clay. Under different moisture content and different stone content, the longitudinal velocity VP, the transverse velocity VS, (VP / VS) and other stress wave parameters with the dry mix density change mechanism; mixed filler Poisson’s ratio with the water content, stone content changes. The correlation analysis model of Poisson’s ratio and aspect-ratio of soil-stone stuffing is established to estimate the ratio of P- to P--Poisson ratio, and the model is verified by laboratory precision. The results show that the ratio of P / S decreases with the increase of the dry density. The P / V ratio curve tends to decrease with the increase of the content of rock and increases with the increase of water content. The Songbi-dry density curve showed an overall upward trend with the increase of water content and a downward trend with the increase of rock content. The average relative error was calculated by the model. The sand-soil mixed material was 0.045 and the silt mixed material was 0.042. 0.034, the project application error is small. On this basis, a new technique of testing the Poisson’s ratio of soil-rock mixed ground with stress wave method is proposed.