黄土节理渗透特性的试验研究
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摘要
通过实验室加工的办法来模拟黄土中的垂直节理,以变水头渗透试验为手段,对有节理黄土进行渗透试验。对原状土和重塑土所进行的相关试验说明,达西定理在分析低水力梯度的节理渗流问题时是适用的。通过进一步研究其渗透系数随时间的变化关系,总结出了有节理黄土的渗流模型,并赋予了模型中参数的实际物理意义。以试验数据为例对模型参数的具体取值进行了分析。该模型能较好地反映有节理黄土渗流的特点。
By using the artificial way to make vertical joint in loess,the seepage tests were carried out by the mean of variable head permeability test in laboratory. The tests were conducted with both undisturbed soil and remolded soil.The results showed that the Darcy Law could be applied to analyze the seepage problems of jointed loess when the hydraulic gradient was low. In addition,in order to further study the relationship between the seepage coefficient and the time,a seepage model of jointed loess was established,which gave the parameters of the model its practical significance. The specific values of the model parameters were analyzed based on the test data. The model could better reflect the characteristics of seepage in jointed loess.
By using the artificial way to make vertical joint in loess,the seepage tests were carried out by the mean of variable head permeability test in laboratory. The tests were conducted with both undisturbed soil and remolded soil.The results showed that the Darcy Law could be applied to analyze the seepage problems of jointed loess when the hydraulic gradient was low. In addition,in order to further study the relationship between the seepage coefficient and the time,a seepage model of jointed loess was established,which gave the parameters of the model its practical significance. The specific values of the model parameters were analyzed based on the test data. The model could better reflect the characteristics of seepage in jointed loess.
引文
[1]梁燕,邢鲜丽,李同录,等.晚更新世黄土渗透性的各向异性及其机制研究[J].岩土力学,2012,33(5):1313-1318.
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[4]赵彦旭,张虎元,吕擎峰.压实黄土非饱和渗透系数试验研究[J].岩土力学,2010,31(6):1809-1812.
[5]张虎元,赵天宇,吴军荣.膨润土改性黄土衬里防渗性能室内测试与预测[J].岩土力学,2011,32(7):1963-1974.
[6]郭鸿,骆亚生,李靖.考虑应力场作用的饱和黄土渗透特性研究[J].水土保持通报,2010,30(1):131-133.
[7]夏才初,王伟,曹诗定.节理在不同接触状态下的渗流特性[J].岩石力学与工程学报,2010,29(7):1297-1306.
[2]高永宝,刘奉银,李宁.确定非饱和土渗透特性的一种新方法[J].岩石力学与工程学报,2005,24(18):3258-3261.
[3]王铁行,卢靖,张建锋.考虑干密度影响的人工压实非饱和黄土渗透系数的试验研究[J].岩石力学与工程学报,2006,25(11):2364-2368.
[4]赵彦旭,张虎元,吕擎峰.压实黄土非饱和渗透系数试验研究[J].岩土力学,2010,31(6):1809-1812.
[5]张虎元,赵天宇,吴军荣.膨润土改性黄土衬里防渗性能室内测试与预测[J].岩土力学,2011,32(7):1963-1974.
[6]郭鸿,骆亚生,李靖.考虑应力场作用的饱和黄土渗透特性研究[J].水土保持通报,2010,30(1):131-133.
[7]夏才初,王伟,曹诗定.节理在不同接触状态下的渗流特性[J].岩石力学与工程学报,2010,29(7):1297-1306.