土工基础

›› 2015, Vol. 29 ›› Issue (2): 109-112.

• 工程实录 • 上一篇    下一篇

京沪高铁全风化石英二长岩路基填料无侧限动三轴试验研究

王长法   

  1. （中铁第四勘察设计院集团有限公司，武汉 430063）
  • 收稿日期:2015-03-03 出版日期:2015-04-20 发布日期:2015-05-04
  • 作者简介:王长法（1965-），男，高工，研究方向为岩土工程。

Dynamic Triaxial Tests on Completely Weathered Quartz Monzonite Soil Samples with Minimal Confining Pressures

WANG Changfa
   

  1. （China Railway Siyuan Survey and Design Group Co., Ltd, Wuhan 430063）
  • Received:2015-03-03 Online:2015-04-20 Published:2015-05-04

摘要： 为降低工程成本，京沪高铁建设中就地取用了石英二长岩全风化物作为路基填筑。通过全风化石英二长岩的无侧限动三轴试验，采集分析了该类土样的应力应变及加载次数关系，计算并探讨回弹模量随加载次数的变化规律，以及含水率与破坏应变等临界参数的关系。结果表明该填料主要工程特性为：含水率越大，临界参数性能越差，破坏趋势出现的越早。在工程实践中通过严格控制填料含水率和物理改良，取得了良好的工程效果和经济效益。

关键词: 全风化, 三轴试验, 含水率, 临界参数

Abstract: The completely weathered quartz monzonite soils are planned to be used as the backfill material for the railway subgrade in Beijing to Shanghai High Speed Rail project in order to reduce the construction cost. The stress-strain relationship with the number of loading cycles; the relationship between the rebound modulus and the loading cycles; the relationship between the moisture content and the failure strain are examined with the dynamic triaxial tests with minimal confining pressure to simulate the shallow embedment of these materials underneath the rail tracks. The results indicate that the higher moisture content will have a smaller failure strain. In the practical engineering application, the control of the moisture and modify the physical properties of the backfill material can result in a satisfactory engineering performance as well as cost effectiveness.

Key words: Completely-Weathered Soils, Triaxial Tests, Moisture Contents, Critical Parameters