Large-scale test of sleeve valve pipe grouted overwet subgrades
Large-scale test of sleeve valve pipe grouted overwet subgrades
复制标题
套筒阀管灌浆过湿路基大型试验
DOI：
10.1680/jphmg.16.00030
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发表时间：
2018-04
期刊：
影响因子：
--
通讯作者：
Sheqiang Cui
中科院分区：
文献类型：
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作者：
Yanhua Guan;Xinzhuang Cui;Dan Huang;Qing Jin;Junjie Lou;Zequn Liu;Fei Hou;Ming Xiao;Sheqiang Cui
低液限粉土路基由于强烈的毛细作用，经常出现过湿现象。袖阀管注浆技术是一种有效的过湿路基加固方法。然而，关于其强化机制及其效果的研究却十分有限。本文建立了四个大比例尺路基模型。分析了不同粉土路基土的含水量和物理力学指标的分布规律。通过循环分级加载试验，研究了路基的整体刚度和变形特性。路基模型开挖后，测试，看看浆液的蔓延模式。根据Vesic空腔膨胀理论，分析了袖阀管注浆的加固机理。结果表明，毛细作用使路基整体刚度和稳定性降低。湿土路基的竖向塑性变形随车辆荷载的增加而迅速增大。...
Due to the intense capillarity action on low-liquid limit silt subgrade, the subgrade is often overwet. The technology of sleeve valve pipe grouting is an effective reinforcement method of the overwet subgrade. However, there are limited studies on the reinforcement mechanism and its effects. In this study, four large-scale subgrade models were set up. Distributions of moisture content and physical mechanical indexes of soil in different silt subgrades were analysed. Integral stiffness and deformation characteristics of the subgrades were studied by cyclic step loading tests. The subgrade models were excavated after tests to see the spreading pattern of the grout slurry. The reinforcement mechanism of the sleeve valve pipe grouting was analysed based on Vesic's cavity expansion theory. The results indicate that the integral stiffness and stability of the subgrade decrease due to the capillary action. The vertical plastic deformation of the wet subgrade rapidly increases with the increase in vehicle load. ...