路堤填芯弱膨胀土线膨胀率测试模拟研究

发布时间：2018-05-11 21:05

本文选题：非饱和土 + 膨胀土　；参考：《工程地质学报》2017年03期

【摘要】：为研究荷载变化方式对膨胀土线膨胀率测定的影响,模拟路堤的实际荷载变化对用于路堤填芯膨胀土的线膨胀率测定进行试验,结果显示,线膨胀率随着上覆荷载的增大而减小,随着初始干密度的增大而增大。将模拟路堤荷载变化状态的线膨胀率试验结果与规范加载方式的试验结果进行对比分析,结果显示,两种荷载变化方式的线膨胀率测定差值较大,且初始干密度越小、上覆荷载越小,荷载变化方式对线膨胀率测定值的影响越大,表明在线膨胀率测定过程中不考虑实际工程的荷载变化方式对用于工程膨胀土的膨胀变形指标测定具有一定的影响,对膨胀土路堤的变形量预测产生一定的影响,在进行膨胀土线膨胀率测定时需要考虑实际的荷载变化方式,并结合荷载变化方式进行线膨胀率测定。
[Abstract]:In order to study the influence of load change mode on the measurement of line expansion rate of expansive soil, the actual load change of simulated embankment is used to test the line expansion rate of expansive soil used for embankment filling. The results show that, The linear expansion ratio decreases with the increase of overburden load and increases with the increase of initial dry density. The results of line expansion test of embankment load change state are compared with those of standard loading mode. The results show that the difference of line expansion ratio between the two load variation modes is larger, and the initial dry density is smaller. The smaller the overlying load, the greater the influence of load change mode on the measured value of linear expansion rate. The results show that the load variation mode of practical engineering is not considered in the on-line expansion rate measurement process, which has a certain influence on the deformation prediction of expansive soil embankment, which is used in the measurement of swelling deformation index of engineering expansive soil. When measuring the linear expansion rate of expansive soil, the actual load change mode should be considered, and the linear expansion rate should be measured in combination with the load change mode.
【作者单位】：南京交通职业技术学院路桥与港航工程学院;
【分类号】：U416.12

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