摘要
土的动剪切模量与阻尼比这两个重要的土动力学特性参数,是土层地震反应分析中必备的数据,也是场地地震安全性评价必不可少的内容。目前地震安全性评价工作所需要的土动剪切模量比阻尼比试验结果多采用动三轴仪器进行试验。该试验涉及到固结比(围压与轴压取值)、频率、固结时间等多个参数,故其试验参数的选取对试验结果是至关重要的。试验参数选取的合理与否,直接影响所取土试样的土动力特性结果的正确与否。本文主要从动三轴试验原理和岩土力学、岩土动力学方面,结合地震安全评价工作实际目的,分析土动剪切模量和阻尼比试验参数意义,并给出参数正确的取值方法,确保土的动剪切模量与阻尼比试验数据结果的可靠性。
The dynamic shear modulus and damping ratio of soils are two important parameters of soil dynamic characteristics. They are essential data for seismic response analysis of soil layers,and for seismic safety evaluation in engineering sites. At present,test results of dynamic shear modulus and damping ratio are carried out by using dynamic triaxial apparatus. Dynamic triaxial tests involves many parameters,such as consolidation ratio（ confining pressure and axial pressure）,frequency,and consolidation time,so it is very important to choose test parameters which would affect soil dynamic characteristics. In this paper,to make sure results reliability of data of dynamic shear modulus and damping ratio,parameters meaning of dynamic shear modulus and damping ratio of soils are analyzed from principles of dynamic triaxial tests,rock-soil mechanics,rock-soil dynamics mechanics,and purposes of evaluation seismic safety,and the calculation method of parameters are given.
出处
《工程抗震与加固改造》
北大核心
2016年第2期144-149,共6页
Earthquake Resistant Engineering and Retrofitting
基金
山东省地震局科研基金(JJ1303)
山东省自然科学基金(ZR2014DQ022)共同资助
关键词
动三轴试验
固结参数
固结比
围压
轴压
动剪切模量
阻尼比
dynamic triaxial test
consolidation parameter
consolidation ratio
confining pressure
axial pressure
dynamic shear modulus
damping ratio
