围压对南海钙质砂的动剪切模量和阻尼比的相关研究  

Correlation Between Confining Pressure and Dynamic Shear Modulus and Damping Ratio of Calcareous Sand in South China Sea

作　　者：高洋洋 张壮壮 宋星 王婷[1] 宋锡俊 GAO Yangyang;ZHANG Zhuangzhuang;SONG Xing;WANG Ting;SONG Xijun(Guangxi Key Laboratory of Geomechanics and Engineering,Guilin University of Technology,Guilin 541004)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《土工基础》2021年第4期504-506,521,共4页Soil Engineering and Foundation

摘　　要：利用GDS动三轴仪对南海钙质砂进行固结不排水试验,主要研究围压对钙质砂动剪切模量比和阻尼比的影响。结果表明:Hardin-Drnevich模型可以较好的模拟复杂应力条件下钙质砂的G/Gmax~γd曲线;动剪切模量试验点随围压的增加而增加,动剪切模量比也随之变大,但是阻尼比的曲线拟合规律和动剪切模量的相反。钙质砂的最大动剪切模量试验点随着围压的增加而增加,表现出一定的线性关系,利用Janbu公式可以对其进行较好的拟合。成果可为以后海域工程抗震设防和地震反应分析提供一定的参考。The consolidation undrained tests of calcareous sand samples from the South China Sea were conducted by using a GDS dynamic triaxial testing apparatus.The results show that the Hardin-Drnevich model can better simulate the g/Gmax~ dry density curve of the calcareous sand under complex stress conditions.The dynamic shear modulus value increases with the increase of the confining pressure,and the dynamic shear modulus ratio also increases,but the curve fitting rule of damping ratio is opposite to that of dynamic shear modulus.The maximum dynamic shear modulus value of the calcareous sand increases with the increase of the confining pressure.This relationship demonstrates a linear trend and could be fitted using Janbu Formula.

关 键 词：动三轴 动剪切模量 阻尼比 最大动剪切模量 

分 类 号：TU411[建筑科学—岩土工程]