img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 996-1002.doi: 10.7522/j.issn.1000-0240.2016.0115

• 环境岩土工程 • 上一篇    下一篇

化学方法改良吹填土固结沉降性质研究

侯鑫1 2, 马巍1, 李国玉1, S. K. Nikolaeva3, 王清4   

  1. 1. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;
    2. 中国科学院大学, 北京 100049;
    3. 莫斯科国立罗蒙诺索夫大学 地质系 工程地质教研室, 俄罗斯联邦 莫斯科 119991;
    4. 吉林大学 建设工程学院 岩土系, 吉林 长春 130026
  • 收稿日期:2016-03-05 修回日期:2016-07-25 出版日期:2016-08-25 发布日期:2016-09-19
  • 通讯作者: 马巍,E-mail:mawei@lzb.ac.cn. E-mail:mawei@lzb.ac.cn
  • 作者简介:侯鑫(1987-),男,山东东平人,2013年在莫斯科国立罗蒙诺索夫大学获硕士学位,现为中国科学院寒区旱区环境与工程研究所在读博士研究生,从事岩土工程研究.E-mail:houx221b@163.com
  • 基金资助:
    国家重点基础研究发展计划(973计划)项目(2012CB026106);甘肃省科技重大专项计划项目(143GKDA007);中国科学院西部之光重点项目(李国玉);中国科学院寒区旱区环境与工程研究所STS项目(HHS-TSS-STS-1502)资助

The research of chemical methods in improving dredger fill's settlement consolidation properties

HOU Xin1 2, MA Wei1, LI Guoyu1, S. K. Nikolaeva3, WANG Qing4   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Engineering Geology Teaching and Research Section, Department of Geology, Moscow State Lomonosov University, Moscow 119991, Russia;
    4. Department of Geotechnical, Architectural Engineering Institute, Jilin University, Changchun 130026, China
  • Received:2016-03-05 Revised:2016-07-25 Online:2016-08-25 Published:2016-09-19

摘要: 大连市大窑湾港区的吹填土为高分散性低液限粉质黏土,其特点是亲水性高,含水量大,排水率低,这造成了吹填土承载力低,在荷载作用下变形量大,在很长一段时间内无法作为正常建筑地基使用.通过在盐水环境下添加不同剂量的浓度为0.1%的絮凝剂Praestol-2515或Praestol-650溶液,可以观察到土颗粒迅速聚合,土粒粒径明显增大,粒间胶结更加均匀和紧密,形成絮状物,从而促进了土颗粒与自由水分的分离,导致过饱和吹填土(悬浊液)沉降速度大大提高,极大地缩短了吹填土的排水固结时间,在短期内达到建筑地基所需要的变形量和承载能力.研究结果对于沿海地区过饱和吹填土的造陆工程,以及类似的高含水率黏性土的地基处理具有重要的启示意义.

关键词: 吹填土, 沉降, 盐水, 絮凝剂Praestol-2515, 絮凝剂Praestol-650, 粒度成分

Abstract: The dredger fill of Dayaowan port in Dalian city, China is silty clay with high dispersion and low liquid limit. It is mainly characterized with high hydrophilicity, high moisture content and low drainage rate, and in turn, leading to its low bearing capacity, big deformation under load. It can not be used as a kind of architectural foundation soil for a long time. By means of adding different doses of flocculant Praestol-2515 or Praestol-650 with a concentration 0.1% in the salt water, it was observed visually that soil particle flocculated rapidly, and that the interparticles'cement tended to be more uniformly and strongly. The particals turned into flocculus and its size increased, resulting in separation between free moisture and soil particle, and increasing settlement's speed and shortening drainage consolidation time. Consequently, the dredger fill can get enough bearing capacity to serve as a kind of architectural foundation soil.

Key words: dredger fill, settlement, saline water, flocculant Praestol-2515, flocculant Praestol-650, granulometric composition

中图分类号: 

  • P642.13+3