土工基础

›› 2017, Vol. 31 ›› Issue (1): 20-24.

• 工程实录 • 上一篇    下一篇

水位降深对真空降水联合强夯处理公路地基的影响研究

侯宏伟1,钱志华2,唐绍明3   

  1. (1.浙江省建筑科学设计研究院有限公司，杭州 310012；2.安吉建设工程质量监督站检测中心，浙江安吉 313300；3.杭州市建设工程质量安全监督总站，杭州 310012）
  • 收稿日期:2016-09-23 修回日期:2016-09-30 出版日期:2017-02-20 发布日期:2017-02-24
  • 作者简介:侯宏伟（1979-），男，高级工程师，研究方向为道路、桥梁、隧道等钢筋混凝土结构试验检测及研究。

Drawdown Effect in the Dynamic Compaction Combined with the Vacuum Dewatering in the Ground Improvements for a Highway Project

HOU Hongwei1, QIAN Zhihua2, TANG Shaoming2   

  1. (1.Zhejiang Academy of Building Research & Design Co. Ltd., Hangzhou 310012;
    2.Testing Center for Ji’an Construction Engineering Quality Supervision Station, Ji’an 313300;
    3.Hangzhou Construction Engineering Quality and Safety Supervision Station, Hangzhou 310012)
  • Received:2016-09-23 Revised:2016-09-30 Online:2017-02-20 Published:2017-02-24

摘要： 结合上虞地区某公路软土地基处理工程，选取两块具有代表性的试验场区，采用真空降水的方式将两试验场区水位降至不同深度处，进行现场对比试验研究水位降深对地基联合加固的影响。通过对比试验分析不同水位降深下，夯后土体的沉降及孔压增长、消散规律；同时对不同水位降深场地进行现场原位试验，对比研究其加固效果。得出结论：水位越高，夯后超静孔隙水越难排出，单位夯能引起的地面沉降量越小，且有效夯击次数减小，孔压消散时间增长；随水位降深提高，6 m径向范围内加固效果显著提升，地基有效加固深度增大。因此，增大水位降深可有效提升加固效果，减小夯后时间间隙，可为类似深厚饱和粉土地基的加固处理提供借鉴。

关键词: 真空降水联合强夯法, 不同水位, 对比试验, 孔压消散, 加固深度

Abstract: Two trial test blocks were selected for the investigation of drawdown effect on the soil soft improvement by the dynamic compaction method in a highway project in Shangyu area. The groundwater was lowered to different depth by the vacuum dewater method. In order to compare the dynamic compaction effect on grounds with different water levels, the development and dissipation of the excessive pore water pressures as well as the ground settlement after the dynamic compaction were monitored. The results indicate that, under the higher groundwater condition, it is more difficult for the dissipation of the excessive pore pressures, and the smaller ground settlement under the unit compaction energy. With the deeper dewatering, a significant soil improvement effect can be found within a horizontal radial distance of six (6) meters and the depth of improvement was also increased.

Key words: Vacuum Dewatering Combined with Dynamic Compaction, Different Drawdown, Trial Tests, Excessive Pore Water Pressure Dissipation, Improvement Depth