浸水条件下石灰改良膨胀土力学性质试验研究

发布时间：2018-06-22 23:33

本文选题：石灰改良膨胀土 + 浸水　；参考：《人民长江》2014年19期

【摘要】：结合特殊路基使用条件,根据室内膨胀土改良及击实试验结果,进行了石灰改良膨胀土浸水不同时间后的直接剪切、固结及CBR(California Bearing ratio)试验,以探索石灰改良膨胀土浸水后力学性质的变化规律,为路堤变形及稳定分析提供计算参数。试验结果表明,浸水后试样表面出现不同程度的松散,导致力学性质指标快速下降,但浸水一段时间后各指标均趋于稳定,其中抗剪强度约为浸水前的70%,压缩模量约为浸水前的30%,CBR强度约为浸水前的80%。分析试验结果,得出石灰改良膨胀土力学性质指标随浸水时间的变化规律,其中,抗剪强度及CBR强度随浸水时间的变化可用对数模型表征,而压缩系数随浸水时间的变化可用乘幂模型表征。应用该研究结果,可以快速预测石灰改良膨胀土浸水后的力学指标,用于路基长期稳定安全分析。
[Abstract]:According to the results of indoor expansive soil improvement and compaction test, the direct shear, consolidation and CBR- (California studying ratio) tests of lime modified expansive soil after soaking in different time were carried out according to the application conditions of special subgrade. In order to explore the variation of mechanical properties of lime modified expansive soil after soaking, the calculation parameters are provided for the deformation and stability analysis of embankment. The experimental results show that the surface of the sample is loosened in varying degrees after immersion, which leads to the rapid decrease of mechanical properties, but the indexes tend to be stable after soaking for a period of time. The shear strength is about 70 and the compression modulus is about 30 and the CBR strength is about 80 before flooding. By analyzing the test results, the variation of mechanical properties of lime modified expansive soil with soaking time is obtained. The variation of shear strength and CBR strength with soaking time can be expressed by logarithmic model. The variation of compression coefficient with immersion time can be expressed by power model. The results of this study can be used to predict the mechanical indexes of lime modified expansive soil after soaking, and to analyze the long-term stability and safety of roadbed.
【作者单位】：淮阴工学院土木工程实验室;徐州市水利工程建设监理中心;长安大学;中国矿业大学;
【基金】：江苏省高校国内高访进修项目(2014) 江苏省住建厅项目(2014)的资助
【分类号】：U416.1;TU43

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