Laboratory investigation of axisymmetric single vacuum well point
Laboratory investigation of axisymmetric single vacuum well point
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DOI：
10.1007/s11771-016-3120-2
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发表时间：
2016-03
影响因子：
4.4
通讯作者：
V. Vu;Lei Yao;Ying-jie Wei
中科院分区：
文献类型：
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作者：
V. Vu;Lei Yao;Ying-jie Wei
真空井点是一种新型但微弱的软土地基处理方法。这项工作的重点是在真空井点结合堆载加载下重构软粘土样本的固结行为。室内试验通过真空堆载固结装置进行，采用真空加载方案进行真空加压，研究真空对土体固结的影响。测试过程中，及时记录了真空压力、孔隙水压力、沉降变形等关键参数。此外，还测量了加载后采集的样品的含水量、孔隙比和渗透系数，以反映固结特性。通过与膜系统和无膜系统的比较，发现真空井点法有一些不同之处。结果表明，轴对称单真空井点的固结行为与真空预压结合预制垂直排水管（PVD）的固结行为几乎相同，只是由于真空井点的结构导致真空压力沿井排水管的分布不同。真空井点法可用于一定深度软粘土矿床的改良。
Vacuum well point is a new but faint soft ground treatment method. This work focuses on the consolidation behavior of a reconstituted soft clayey specimen under vacuum well point combined with surcharge loading. The laboratory test was conducted through a vacuum-surcharge consolidation apparatus, and the vacuum loading scheme was adopted for vacuum pressure application to investigate the vacuum effect on soil consolidation. In the testing process, some key parameters such as vacuum pressure, pore water pressure and settlement deformation were timely recorded. Furthermore, the water content, void ratio and permeability coefficient of samples collected after loading were measured to reflect the consolidation characteristics. By comparing with the membrane system and membraneless system, something different was found for the vacuum well point method. The results indicate that the consolidation behavior of an axisymmetric single vacuum well point is almost identical to the behavior of vacuum preloading combined with prefabricated vertical drain (PVD), except for the distribution of the vacuum pressure along the well drain due to the structure of the vacuum well point. And the vacuum well point method may be useful for the improvement of soft clayey deposit in a certain depth.