地球介质的非定常参数黏弹模型  

Viscoelastic model with variable parameters for earth medium

作　　者：施行觉[1] 李成波[1] Adnan Aydin 黄建华[1] 赵闯[1] 

机构地区：[1]中国科学技术大学地球和空间科学学院,合肥230026 [2]University of Mississippi, Department of Geology and Geological Engineering, MS 38677,USA

出　　处：《地球物理学报》2009年第1期50-56,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40774096)资助

摘　　要：用开尔文黏弹模型对实验蠕变曲线和冰后期地面抬升观测曲线进行反演,得到相关的黏弹参数,发现所有的黏弹参数都随实验（或观测）时间长度发生有规律的变化,表明黏弹参数是实验（或观测）时间的函数.在此基础上提出非定常参数的黏弹模型,将通常采用的剪切模量μ2、弛豫时间τ和黏度η相应地从常数修正为时间的函数μ2（t）、τ（t）和η（t）,检验表明修正后的开尔文模型可以更好地符合实测蠕变曲线.用修正后的μ2（t）对软流层的黏度进行估算,其值约为4.6×10^20Pa.s.The data of creep experiments and surface uplifting after glaciation were inversed to get the viscoelastic parameters by using Kelvin model.All the obtained viscoelastic parameters varied with time.It meant the viscoelastic parameters were the function of time.Then the viscoelastic model with variable parameters was put forward.The elastic modulus μ2,elapse time τ and viscosity η were replaced by μ2（t）,τ（t）and η（t）respectively.The modified Kelvin model would simulate the experimental creep curve better.The viscosity of soft layer was estimated by using the modified μ2（t）,it is about 4.6×10^20Pa·s.

关 键 词：低应力水平 蠕变实验 冰后期地面抬升 标准线性体模型 变参数黏弹模型 

分 类 号：P313[天文地球—固体地球物理学]