摘要
介绍了现场测试与实验室测试土的最大动剪切模量的差别、动剪切模量和阻尼比与剪应变关系的表达式及其地区经验成果、固结比对最大动剪切模量影响、动泊松比研究、实验误差及其对地震动的影响等方面的主要成果。提出应加强动泊松比研究,加强共振柱和动三轴试验土动力学参数统一的数学模型研究,加强土动力学参数在均等固结与非均等固结条件下关系研究,加强土动力学参数与土的常规物理力学性质指标关系研究和土动力学参数实验误差研究。
This paper presents the main research accomplishments that relate to the differences in the maximum dy-namic shear modulus between laboratory and field test soils,the relationship expressions of the dynamic shear mod-ulus and damping ratio versus shear strain and its local experiences,the effects of consolidation ratios on the maxi-mum dynamic shear modulus,results from dynamic Poisson ratio studies,and experimental errors and their effects on seismic motion results.The factors affecting the maximum dynamic shear modulus difference in field and labora-tory tests are mainly the soil specimen stress state,the consolidation ratio,the size effect,the degree of disturb-ance,the time effect,the secondary consolidation effect,and the soil mass inhomogeneity and anisotropy.The max-imum dynamic shear modulus obtained from the anisotropic consolidation test method that considers the real consol-idation ratio is closer to that of the in-situ wave velocity test method.Experimental results of the soil’s dynamic shear modulus and damping ratio show uneven geographical distribution,rough soils classification,distant connec-tion with the physicomechanical indices of soils,disunity among the experimental apparatus,the experimental meth-od,and the data processing model,and few studies on experimental errors.Studies on the dynamic Poisson ratio of the soils are comparatively weak.We suggest a number of studies be carried out that concentrate on the dynamic Poisson ratio,a unified mathematical model of the dynamic parameters of the resonant column and cyclic triaxial test soils,the relationship between soil dynamic parameters under isotropic and anisotropic consolidation conditions,the relationship between soil dynamic parameters and the conventional physicomechanical index,and the experimental errors of soil dynamic parameters.
出处
《地震工程学报》
CSCD
北大核心
2016年第2期309-317,共9页
China Earthquake Engineering Journal
基金
中国地震局地震科技星火计划项目(XH15058)
关键词
动剪切模量
阻尼比
泊松比
土动力学
地震安全性评价
dynamic shear modulus
damping ratio
Poisson ratio
soil dynamics
seismic safety evaluation
