›› 2015, Vol. 36 ›› Issue (S2): 551-558.doi: 10.16285/j.rsm.2015.S2.077

• 岩土工程研究 • 上一篇    下一篇

排水板和砂井联合堆载预压加固海相软土地基的工作性状的现场试验

蒋建清1,曹国辉1,刘热强2   

  1. 1. 湖南城市学院 土木工程学院,湖南 益阳 413000;2. 广东省建筑工程机械施工有限公司,广东 广州 510500
  • 收稿日期:2015-02-11 出版日期:2015-08-31 发布日期:2018-06-14
  • 作者简介:蒋建清, 男, 1979年生,博士,副教授,从事岩土工程与结构工程研究。
  • 基金资助:

    国家自然科学基金(No.51308198);湖南省教育厅资助科研项目(No.14B034);湖南省科技计划项目(No.2014SK3180)。

Field test on behaviours of marine soft soil foundation treated with plastic drainage plate and sand column combined with surcharge preloading

JIANG Jian-qing1, CAO Guo-hui1, LIU Re-qiang2   

  • Received:2015-02-11 Online:2015-08-31 Published:2018-06-14

关键词: 软土地基, 工作机制, 堆载预压, 砂井, 塑料排水板, 现场试验

Abstract: In order to solve the technical difficulties to reinforce the deep marine soft soil foundation that including walkway network, the reinforcing technology by plastic drainage plate and sand column combined with surcharge preloading is proposed to reinforce the large scale complex deep marine soft soil foundation. The mechanical behaviors of the reinforced soft soil foundation during embankment filling and preloading are studied including the surface settlement and deep settlement characteristics, the excess pore water pressure dissipation mechanism, and the horizontal displacement law by field tests. The results show that the construction method used to reinforce the deep marine soft soil foundation has achieved good reinforcing effects. The settlement of the deep marine soft soil foundation accomplished mostly during the period of filling and preloading, which effectively reduce the post-construction settlement and construction period. The results provide an important reference for the reinforcement of the complex deep marine soft soil foundation. The settlement versus time curve of the marine soft soil foundation treated with plastic drainage plate and sand column combined with surcharge preloading is multistage development model. The settlement at the site reinforced by sand column is less than that at the site reinforced by plastic drainage plate. Meanwhile, the excess pore water pressure at the site reinforced by plastic drainage plate is greater than that at the site treated with sand column. The drainage effect of the upper soft soil is significantly superior to the lower. The top soil of the soft foundation under surcharge preloading would move to the treated area; while the soft soil below the surface 3 m would be pushed outside the region treated with plastic drainage plate and sand column.

Key words: soft soil foundation, mechanism, preloading, sand column, plastic drainage plate, field test

中图分类号: 

  • TU 443
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