吹填粉细砂的无填料振冲密实试验与工程应用

›› 2012, Vol. 33 ›› Issue (4): 1129-1133.

吹填粉细砂的无填料振冲密实试验与工程应用

何开胜¹，过兴发²

1. 浙江理工大学建筑工程学院，杭州 310018；2. 南通港口集团有限公司，江苏南通 226006

收稿日期:2010-10-08 出版日期:2012-04-13 发布日期:2012-04-26
作者简介:何开胜，男，1963年生，博士，教授，主要从事软土地基处理、土工数值分析等方面的教学和科研工作

Test and application of vibro-compaction of dredging silty fine sands without additional backfill materials

HE Kai-sheng¹，GUO Xing-fa²

1. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China; 2. Nantong Port Group Co., Ltd., Nantong, Jiangsu 226006, China

Received:2010-10-08 Online:2012-04-13 Published:2012-04-26

摘要/Abstract

摘要： 对长江下游河漫滩地新吹填的松散粉细砂，通过原位监测仪器和跟踪检测，进行了无填料振冲试验、施工技术开发和设计应用。研究了无填料振冲过程中桩周土的超静孔压变化与振冲有效范围，比较了振冲密实前、后桩周土强度变化。针对施工跟踪检测中发现的桩身土局部欠密实问题，分析了缺陷产生原因，提出了解决措施。结果表明，目前规范认为应加填料振冲处理的各种松散粉细砂，只要试验方法得当，及时发现振冲中可能出现的问题并予以解决，吹填粉细砂的无填料振冲密实法是可以大面积应用的。工程试验后提出的振冲设计参数、施工工艺参数和质量控制方法，最终检测显示，工程桩各项指标达到堆场使用要求。

关键词: 无填料振冲密实, 吹填, 粉细砂, 地基处理

Abstract: For the silty fine sands of 3 to 5 m thickness justly formed by dredging at the material yard of a bulk cargo wharf, based on the instrumented monitoring results of a testing area improved by vibro-compaction without additional backfill materials and trace inspection in the project, the change of excess pore water pressure and range of validity of vibroflotation is analyzed. The strengths are compared before and after vibroflotation. The design parameters, construction techniques and quality control method of vibro-compaction are proposed for the large-scale practice. In the first inspection, the problem of local poor compaction inside the vibroflotation column is found; the resulting reasons are analyzed and resolving measures are put forward. The final inspection results of large-scale practice indicate that the proposed parameters are feasible; the quality of improving ground satisfies the design requirements. The testing and application of this project indicates that vibro-compaction method without additional backfill materials for silty fine sands can be used for large-scale practice after the scientific testing methods quality tracking and solving measures of defects carried out.

Key words: vibro-compaction without additional backfill materials, dredging, silty fine sands, ground treatment

中图分类号:

TU 441+.8

何开胜，过兴发. 吹填粉细砂的无填料振冲密实试验与工程应用[J]. , 2012, 33(4): 1129-1133.

HE Kai-sheng ，GUO Xing-fa. Test and application of vibro-compaction of dredging silty fine sands without additional backfill materials[J]. , 2012, 33(4): 1129-1133.

参考文献

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