土工基础

›› 2019, Vol. 33 ›› Issue (4): 460-464.

• 工程实录 • 上一篇    下一篇

广州地区花岗岩风化土液性指数探讨及应用

彭功勋   

  1. （广州市市政工程设计研究总院有限公司，广州 510060）
  • 收稿日期:2018-09-20 修回日期:2018-09-30 出版日期:2019-08-20 发布日期:2019-08-16
  • 作者简介:彭功勋（1973-），男，工学博士，教授级高级工程师，注册土木工程师（岩土），注册咨询工程师（投资），研究方向为岩土工程。

Liquid Index of Weathered Granitic Soil and Its State Boundary

PENG Gongxun   

  1. (Guangzhou Municipal Engineering Design & Research Institute Co. Ltd., Guangzhou, 510060)
  • Received:2018-09-20 Revised:2018-09-30 Online:2019-08-20 Published:2019-08-16

摘要： 首先探讨了花岗岩风化土粗颗粒（ds>0.5 mm）对其工程特性的影响及花岗岩风化土液性指数的计算方法；以广州地区359对土工实验和标准贯入测试（SPT）数据为基础，分析了地理条件对广州地区花岗岩风化土颗粒组成特点的影响，研究了液性指数IL与标准贯入击数N之间的相关性，依此确定了花岗岩风化土状态分界点的液性指数值。在此基础上，提出了两种有利于工程安全的花岗岩类风化土状态综合划分法：简单综合法和综合指数法，并将其与单一N值划分法进行了比较，最后通过工程实例展示了两种方法的应用，分析了其有效性。

关键词: 粗颗粒, 花岗岩风化土, 液性指数, 标准贯入击数, 状态分界

Abstract: In this paper, the influence of coarse grains (ds>0.5 mm) on the engineering properties of weathered granite soils and the calculation method of liquid index of weathered granite soil are discussed. The correlation between the liquid index IL and the standard penetration test blow count number N is studied. The liquid index value of the boundary point of the state of weathered granite soil is also developed. Two comprehensive classification methods of weathered granite soils are proposed: namely, simple synthesis method and comprehensive index method. These methods are also compared with the single N value classification method. The application of these two methods is demonstrated by an engineering case history.

Key words: coarse grains, weathered granite soil, liquidity index, standard penetration test blow counts, state boundary