土工基础

›› 2018, Vol. 32 ›› Issue (5): 524-527.

• 工程实录 • 上一篇    下一篇

砂与粉煤灰对桂林红黏土性质的影响研究

谭景和1,2，孙健森1,2，刘会强1,2   

  1. (1.桂林理工大学土木与建筑工程学院，广西桂林 541004;2.广西岩土力学与工程重点实验室，广西桂林 541004)
  • 收稿日期:2017-12-08 修回日期:2017-12-15 出版日期:2018-10-30 发布日期:2018-11-02
  • 作者简介:谭景和(1968-)，男，硕士，讲师，研究方向为岩土工程。

Influence of Sand and Fly Ash Contents on the Properties of Guilin Red Clay Mixtures

TAN Jinghe1,2 , SUN Jiansen1,2 , LIU Huiqiang1,2   

  1. (1.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
    2.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004)
  • Received:2017-12-08 Revised:2017-12-15 Online:2018-10-30 Published:2018-11-02

摘要： 为了研究砂与粉煤灰不同掺量及不同养护时间对桂林红黏土的改性效果，进行了直剪试验、CBR试验以及电镜扫描试验。试验结果表明：在直剪试验中，各掺量的砂与粉煤灰在初期对桂林红黏土的强度影响不大，但随着龄期的延长，强度会缓慢提高直至呈平缓趋势，且最优掺配比例为20%砂和10%粉煤灰；在CBR试验中，掺加砂与粉煤灰时既能提高承载比又能降低膨胀量；从微观结构分析，掺和砂和粉煤灰红黏土从根本上改变了土体结构，使强度和稳定性得到改善。

关键词: 改性红黏土, 抗剪强度, 加州承载比, 微观结构

Abstract: The effect of sand and fly ash contents on the Guilin Red Clay mixtures was studied throughout the direct shear, California Bearing Ratio (CBR) and scanning electronic microscope tests. The following conclusions can be obtained: For the direct shear tests, the strength of the Guilin Red Claysand and fly ash mixtures has no significant difference at early curing age of the mixtures. With the curing age, the shear strength will increase and approach to a stable value. The optimum mixture contained 20% sand and 10% fly ash. In the CBR tests, the additives can effectively increase the CBR values and reduce the amount of the expansion. The microstructure study indicates that that additives change the microstructure of the Guilin Red Clay soils and improve the strength and stability.

Key words: Modified Guilin Red Clay, Shear Strength, California Bearing Ratio, Micro-Structures