| Civil Engineering |
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| Vacuum preloading test for high moisture content slurry using particle image velocimetry |
Xiao-dong PAN( ),Lian-mo ZHOU,Hong-lei SUN,Yuan-qiang CAI,Li SHI,Zong-hao YUAN |
| Department of Architecture Engineering, Zhejiang University of Technology, Hangzhou, 310014, China |
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Abstract The particle image velocimetry (PIV) technique was used to obtain the displacement field of dredged slurry with high water content utilizing prefabricated vertical drains (PVDs), in order to investigate the consolidation behavior of the soil around the drain under the vacuum pressure. As results, the soil near the PVD experienced horizontal displacement and the inward lateral displacement expanded to regions away from the PVD along with the vacuum preloading process. The soil near the PVD mainly underwent radial consolidation, and the vertical displacement of the soil away from the drain was bigger. The vertical displacement accumulated, forming a “soil pile” phenomenon in which the soil neighboring the PVD was convex. The measurement results from the pore pressure also show the difference in radial consolidation at diverse positions, and the soil which is located near the PVD consolidate faster. As for soil located 15 cm from the PVD, the degree of consolidation calculated by displacements is larger than the degree of consolidation calculated by pore pressure dissipation.
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Received: 20 May 2019
Published: 06 July 2020
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基于粒子图像测速的高含水率软土真空预压试验
为了更加直观地研究真空预压过程中土体的固结变形规律，采用粒子图像测速技术（PIV），开展高含水率软土真空预压模型试验，观测真空预压过程中塑料排水板（PVDs）周围土体位移场的变化. 结果表明：排水板周围土体产生了水平方向的位移，且随着真空预压的进行，产生水平位移的范围不断扩大；排水板近处的土体以水平位移为主，主要发生径向固结，距排水板远处土体以竖向位移为主，主要发生竖向固结，并因此形成了排水板处土体凸起而远处下沉的“土桩”现象. 结合孔隙水压力值监测结果，认为土体中不同区域的径向固结存在差异，距离排水板近处的土体排水固结更快. 另外，对于距离排水板15 cm范围内的土体，通过径向位移计算得到的固结度大于通过孔隙水压力值计算得到的固结度.
关键词：
真空预压,
塑料排水板（PVDs）,
粒子图像测速技术（PIV）,
高含水率软土
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