土工基础

›› 2012, Vol. 26 ›› Issue (3): 64-65.

• 工程实录 • 上一篇    下一篇

控制沉降真空预压停泵的标准研究

熊 熙，王杰光，曹 辉，张 朋   

  1. （桂林理工大学土木与建筑工程学院，广西桂林 541004）
  • 收稿日期:2011-10-13 出版日期:2012-06-20 发布日期:2012-06-25
  • 作者简介:熊熙（1986-），男，桂林理工大学土木与建筑工程学院在读研究生。
  • 基金资助:

    基金项目：广西研究生教育创新计划资助项目，堆载预压对淤泥质软土工程力学特性的影响研究（2011105960814M10）。

Criteria for the Pumping Termination in Vacuum Preloading

XIONG Xi, WANG Jieguang, CAO Hui, ZHANG Peng   

  1. (College of Civil Engineering and Architecture, Guilin University of Technology, Guilin Guangxi 541004)
  • Received:2011-10-13 Online:2012-06-20 Published:2012-06-25

摘要： 通过真空联合堆载预压处理软基的现场试验，对控制停泵的标准(即沉降速率＜5 mm／月)进行分析。结果表明：该标准显然过于严格，难以达到；即使能够达到造价也过高，因此也是难以应用的。综合考虑软土卸载再加载压缩变形特性和超载引起软土超固结性，在卸载标准上进行修正，推求出实际施工停泵前允许沉降速率。

关键词: 软土卸载, 超固结性, 标准, 沉降速率, 停泵

Abstract: The soft soil improvement project combined with vacuum preloading and surcharge is summarized in this paper. The conventional pumping termination criterion in the preloading project is the settlement rate equal or less than 5 mm per month. The results in this case study indicate that the criterion is excessively high and is difficult to achieve or at very cost if it can be achieved. This study modifies this criterion by considering the unloading and reloading characteristics of soft soils and the over-consolidation phenomena induced by the removal of the surcharge.  The pumping termination criteria can be obtained by considering the allowable post construction settlement of the roadway, even if the settlement rate prior to the pumping termination is greater than the conventional 5mm per month.

Key words: Soft soil unloading, Over-consolidated characteristics, Pumping termination criterion, Settlement rate, Pumping termination