土工基础

›› 2018, Vol. 32 ›› Issue (5): 539-544.

• 工程实录 • 上一篇    下一篇

不同水泥掺量加固下软土深基坑变形研究

李 明1，吴 波1,2，李春芳3   

  1. （1.福建工程学院土木工程学院，福州 350118；2.广西大学土木建筑工程学院，南宁 530004；3.中交一公局厦门工程有限公司，福建厦门 361021）
  • 收稿日期:2017-12-21 修回日期:2018-01-04 出版日期:2018-10-30 发布日期:2018-11-02
  • 作者简介:李 明（1988-），男，讲师，研究方向为地下工程结构可靠度分析等。
  • 基金资助:

    国家自然科学基金资助项目（No. 51478118, No. 51678164）；福建省自然科学基金资助项目（No.2018J01624）；福建省教育厅中青年教师教育科研项目（No. JAT160329）。

The deformation Study of Deep Excavation in Soft Soil Improved with Various Cement Ratios

LI Ming1, WU Bo1,2 , LI Chunfang3   

  1. (1.College of Civil Engineering, Fujian University of Technology, Fuzhou 350118;
    2.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004;
    3.Xiamen Engineering Co., Ltd., CCCC First Highway Engineering Group, Xiamen 361021)
  • Received:2017-12-21 Revised:2018-01-04 Online:2018-10-30 Published:2018-11-02

摘要： 目前软土基坑加固中水泥掺量往往通过经验选取，缺乏理论依据。整理了水泥土力学特性的相关研究成果，给出了不同水泥掺量下水泥土无侧限抗压强度、内聚力、内摩擦角、变形模量的变化规律；通过数值分析研究了不同水泥掺量加固下基坑水平位移、地表沉降的变化规律，结果表明基坑的最大水平位移、最大地表沉降随水泥掺量的增加呈抛物线形减小，加固对基坑变形的限制作用随水泥掺量的增加而增大，但有一近似上限值。结合安全性、经济性的原则，将计算分析结果应用于福州某软土深基坑工程加固中，实测结果表明加固方案合理可靠。

关键词: 基坑, 加固, 水泥掺量, 变形, 安全

Abstract: The optimum cement content for the deep excavation in soft soils improved by the cement mixing method is usually selected by the experience and no technical bases are followed. This paper presents the results of the cement mixing research results. The unconfined compressive strength, cohesion, internal friction angle, deformation modulus of the soilcement mixing samples with various cement contents are studied. The lateral deflection of the deep excavation structure, ground subsidence with various cement content are numerically simulated. The results indicate that, the maximum lateral deflection the supporting structure and the ground subsidence reduce with the increase of the cement content. The soil improvement effect is also increase with the cement content. The laboratory study results were used in a soft soil deep excavation improvement project in Fuzhou and the results are satisfactory.

Key words: Foundation Excavation, Soil Improvement, Cement Ratios, Deformation, Construction Safety