薄砂层长短板结合真空预压法处理吹填淤泥土试验研究

唐彤芝; 董江平; 黄家青; 张雄壮; 关云飞

薄砂层长短板结合真空预压法处理吹填淤泥土试验研究 English Version

1.南京水利科学研究院，江苏南京 210029; 2. 中交上航局航道建设有限公司，浙江宁波 315200

基金项目: 水利部科技推广项目（S310002）；中央级公益性科研院所基本科研业务费专项资金重点项目（Y30703）

详细信息

作者简介:
唐彤芝 (1974 – ),男，湖南东安人，博士，高级工程师，从事地基加固技术研究与应用。

中图分类号: TU472
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出版历程
- 发布日期: 2012-05-19

Experimental research on hydraulic filled mud consolidated by vacuum preloading method combining long and short boards with thin sand cushions

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China; 2. SDC Waterway Construction Co., Ltd., Ningbo 315200, China

摘要

摘要: 薄砂层长短板真空预压法是快速加固新近吹填淤泥的一种新工艺。研究表明，抽真空 90 ～ 120 d 吹填淤泥土层平均压缩量可达到 30% ，呈现明显的大变形特征；平均固结度可达到 80% 以上；强度增长明显，检测表层承载力可达到 50 kPa 以上。该方法节省用砂量，便于泥面插板施工，显著改善表层排水条件，能满足浅层快速加固的建设要求。设置护膜土工布有利于水平排水和膜下真空度稳定。设置薄砂层和长短板结合的竖向排水体形式，可平衡和抑制负压作用下新近吹填淤泥土颗粒的径向流动，避免出现排水板周围淤泥抱团而导致的径向排水通道堵塞问题，保障场地加固效果的均匀性。加固后吹填淤泥的物理力学性质得到大幅度改善，与正常淤泥质软土相比，其发展趋势和轨迹是相符的，主要指标值之间的相关性规律是基本一致的。
- 真空预压 /
- 吹填淤泥 /
- 竖向排水体 /
- 沉降 /
- 固结 /
- 承载力
Abstract: The vacuum preloading method combining long and short boards with thin sand cushions is a new technology to consolidate newly reclaimed mud foundation. The experimental research indicates that the average soil compression reaches 30%, obviously showing large deformation features, and the average degree of consolidation reaches above 80% after vacuum preloading of 90~120 days. The soil strength significantly increases and the surface bearing capacity reaches 50 kPa or above. This method needs less amount of sand and is convenient for inserting the plate on the surface and improves the surface drainage condition significantly. To this end it can meet the requirements of the construction of shallow rapid reinforcement. The geotextile to protect the membrane can maintain steady vacuum degree under the membrane and benefit drainage consolidation and strength increase. By placing the sand cushions and vertical drainages with long and short boards, the radical flow of soil particles in the newly reclaimed mud foundation with extra high water content under negative pressure can be balanced and controlled, the radical drainage channel congestion in duled by mud gathering around the drainage boards can be avoided, and the uniformity of the consolidation effect is thus ensured. The physical and mechanical properties of the reclaimed mud foundation is significantly improved after consolidation, whose developing trend and orbit are in agreement compared with those of the normal mud soft soil, and the correlation laws of their main indices are consistent in general.
- vacuum preloading /
- hydraulic filled mud /
- vertical drainage body /
- settlement /
- consolidation /
- bearing capacity

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参考文献(9)

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