土工基础

›› 2016, Vol. 30 ›› Issue (6): 714-717.

• 工程实录 • 上一篇    下一篇

花岗岩残积土在高应力作用下物理力学特性探讨

陈洪全，陈定安，曾治国   

  1. (中冶集团武汉勘察研究院有限公司，武汉 430080)
  • 收稿日期:2016-09-18 修回日期:2016-09-27 出版日期:2016-12-20 发布日期:2016-12-22
  • 作者简介:陈洪全（1967-），男，工程师，研究方向为岩土工程勘察与资源勘探。

Physical and Mechanical Properties of Undisturbed Granite Residual Soils under High Stress

CHEN Hongquan, CHEN Dingan, ZENG Zhiguo   

  1. (Wuhan SurveyingGeotechnical Research Institute Co., Ltd., MCCC, 430080)
  • Received:2016-09-18 Revised:2016-09-27 Online:2016-12-20 Published:2016-12-22

摘要： 采用人工方法，从某排土场基底采取花岗岩坡残积土进行室内常规直剪固结快剪试验与中压三轴固结不排水试验。在试验中，分别测定每个试样应力应变曲线及试验前后的密度、含水率。经数据整理发现，CU试验各级固结围压下，试样固结后的密度、含水率与固结围压间呈规律性变化；通过统计分析得到了花岗岩坡残积土c、φ值与固结围压之间的变化关系。利用试样固结后的密度、含水率与固结围压之间的变化规律估算排土场基底花岗岩坡残积土在不同堆高时的物理特征；利用c、φ值与固结围压之间的变化关系，估算排土场基底花岗岩坡残积土在不同堆高时抗剪强度取值。

关键词: 花岗岩残积土, CU试验, c、&phi, 值

Abstract: The block undisturbed samples of colluvial residual soils from the granite parental bedrock were collected manually from the bottom of a proposed waste soil storage site. The undisturbed soil samples were performed for conventional consolidated drained and undrained direct shear tests, and consolidated undrained triaxial shear test under intermediate confining pressures. The moisture contents densities before and after the test as well as the stressstrain curves were monitored. The test results indicate that there are relationships exist among the confining pressure and sample density as well as moisture content. The statistic relationship between the shear strength parameters (cohesion and internal friction angle) and the confining pressures can be obtained. Based on the laboratory test results, the shear strength property (cohesion and internal friction angle) of the residual soils at different heights of overburden soils can be estimated from the unit weight, moisture as well as the proposed confining pressure.

Key words: Granite Residual Soils, Consolidated Undrained Test, Cohesion and Internal Friction Values