CLC number:
On-line Access: 2022-08-22
Received: 2021-11-16
Revision Accepted: 2022-05-10
Crosschecked: 2022-08-30
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Xiao-wu TANG, Wei-kang LIN, Yuan ZOU, Jia-xin LIANG, Wen-fang ZHAO. Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2100585 @article{title="Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation", %0 Journal Article TY - JOUR
真空固结排水管桩承载力试验研究机构:1浙江大学,滨海与城市岩土工程研究中心,中国杭州,310058;2浙江省城市地下空间开发工程研究中心,中国杭州,310058 目的:为进一步促进地基处理与桩基工程的结合,本文提出真空固结排水管桩。通过与普通桩与开孔桩对比,研究真空固结排水管桩的承载力增长趋势、桩侧摩阻力分布、桩周土抗剪强度与含水量的变化规律等,为真空固结排水管桩应用与实际工程提供理论依据。 创新点:1.提出了一种能加快软土固结且不会发生淤堵的地基处理与桩基工程相结合的真空固结排水管桩;2.通过承载力、含水量、十字板剪切等试验定义了真空固结排水管桩对桩周土的强(弱)增强区,并利用该定义修正规范,提出了一种单桩极限承载力估算方法。 方法:1.对静压和真空预压条件下的管桩、钻孔桩和排水管桩进行单桩静载试验、十字板剪切试验和含水量试验;2.根据试验结果,对比分析不同桩型在不同工况下单桩承载力、桩身轴力和桩侧摩阻力的变化规律(图7~9);3.对桩周土体不同位置的抗剪强度和含水量分布进行试验(图11~15)。 结论:1.真空固结排水管桩无淤塞现象;根据单桩静载试验,真空固结排水管桩承载力从普通管桩的89.5N提高到271.5N,提升约3倍(考虑到桩顶密封对真空度的影响以及桩间距对排水固结的影响,实际工程中增长幅度可能会下降);一方面,孔隙水在负压作用下加速排泄,提高了土体的抗剪强度;另一方面,土壤中的细颗粒逐渐聚集到桩壁上,形成一个密实的土层,从而扩大桩径。2.真空固结排水管桩最大桩摩阻力是普通桩的3~4倍,且真空固结改变了摩擦阻力的分布形式;桩侧摩阻力在桩的中下部得到了更好的发挥。3.加固区半径与排水量呈正相关;利用两个区域交界处的抗剪强度来估算单桩的极限承载力可以取得良好的效果。 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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Field study of pile-prefabricated vertical drain (PVD) interaction in soft clay. Canadian Geotechnical Journal, 58(5):748. Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou
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