土工基础

›› 2019, Vol. 33 ›› Issue (2): 210-214.

• 工程实录 • 上一篇    下一篇

非饱和花岗岩残积土抗剪强度预测公式适用性研究

陈枝东1，张领帅1，陈敏华1，陆 钊1,2,3，陈晓亮3，陈 锐3   

  1. (1.深圳市宏业基岩土科技股份有限公司岩土工程设计所,广东深圳 518000；2.澳门大学土木与环境工程系,澳门 999078；3.哈尔滨工业大学（深圳）土木与环境工程学院,广东深圳 518000）
  • 收稿日期:2019-02-18 修回日期:2019-03-06 出版日期:2019-04-20 发布日期:2019-04-22
  • 作者简介:陈枝东（1976-），男，工程师，研究方向为岩土工程设计勘察与计算分析。
  • 基金资助:

    深圳市科技研发资金（项目编号JSGG20170413163030692）;深圳市科技研发资金（项目编号20180504170449754）

Evaluation of Formulas for Estimating the Shear Strength of Unsaturated Granitic Residual Soils

CHEN Zhidong1, ZHANG Lingshuai1, CHEN Minhua1, LU Zhao1,2,3, CHEN Xiaoliang3， CHEN Rui3   

  1. （1.Shenzhen Hongyeji Geotechnical Science and Technology Co., Ltd., Shenzhen 518000；
    2.Department of Civil and Environmental Engineering, University of Macau, Macau 999078；
    3.College of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518000）
  • Received:2019-02-18 Revised:2019-03-06 Online:2019-04-20 Published:2019-04-22

摘要： 花岗岩残积土在我国华南地区分布极为广泛，通常处于非饱和状态，但国内外学者对非饱和花岗岩残积土的力学特性研究却较为有限。采用非饱和花岗岩残积土的不排水直剪试验数据对三个非饱和土强度预测公式进行了验证。结果表明Oberg公式所预测的强度与实测强度吻合度最高，同时该公式仅需提供土样破坏时的饱和度即可对强度进行预测，参数获取简单且便于工程推广。

关键词: 花岗岩残积土, 非饱和, 直剪试验, 抗剪强度

Abstract: The granitic residual soils are widely distributed in southern China and these soils are generally unsaturated in nature. However, the mechanical properties of the unsaturated granitic residual soils are rarely reported. This paper presents the undrained directed shear test result of the unsaturated granitic residual soils. The tested shear strength values were compared with three different formulas for the shear strength estimations. The comparative results indicate that the Oberg formula had the best estimation results. Further, this formula can predict the shear strength by only providing the degree of saturation at failure, therefore, it can be easily applied in the practical engineering projects.

Key words: granitic residual soils, unsaturated soils, direct shear tests, shear strength