钙质砂三轴固结不排水剪切特性研究

Study on Shear Properties of Calcareous Sand by Consolidated Undrained Triaxial Test

采用三轴固结不排水剪切试验,对南海海区岛礁饱和钙质砂进行剪切特性分析。结果表明:围压并不是影响偏应力的主要因素;达到偏应力峰值所对应的轴应变均在3%以内;初始弹性模量随初始孔隙比增大而减小,初始围压越大,初始弹性模量也越大;在给定的初始孔隙比下,剪切模量随着围压增大而增大。

The shear properties of saturated calcareous sand in the area of South China Sea was selected to analyze by consolidated undrained triaxial test.The result shows that confining pressure is not the main factor affecting deviatoric stress;when the deviatoric stress peaks,the corresponding axial strain is always within 3%;initial elastic modulus decreases with the increment of initial void ratio,the greater the confining pressure,the greater the initial elastic modulus;under the given initial void ratio,the shear modulus increases with the increment of confining pressure.