分量式钻孔应变观测耦合系数的计算  

Component borehole strain observations coupling coefficients calculation

作　　者：张凌空[1] 牛安福[1] 

机构地区：[1]中国地震台网中心,北京100045

出　　处：《地球物理学报》2013年第9期3029-3037,共9页Chinese Journal of Geophysics

基　　金：国家科技支撑计划项目(2012BAK19B02-02);地震行业科研专项(201108009)联合资助

摘　　要：根据双衬套钻孔应变观测力学模型,推导出平面应力作用下各分量应变观测中两个耦合系数(A、B)的计算公式,为进一步确定地壳应变场最大、最小主应变的数值及方向提供了必需的前提条件,对当前国内外开展的利用钻孔应变进行地震、火山和板块边界的观测研究具有一定积极意义.研究结果表明,A、B与用双环模型和复变函数法解算出的c(面应变响应因子)、d(剪应变响应因子)之间分别存在2倍的关系(c=2A,d=2B),并且二者绘制的曲线完全一致,c、d的物理含义分别是地壳岩石面应变与剪应变观测的井孔耦合系数.Based on the double bushing borehole strain observation mechanical model,we deduced the calculation formulae of two coupling coefficients（A,B）of each strain component under plane stress.This provides a basis for further determining the value and direction of maximum and minimum principal strain of the crustal strain field,and has a positive meaning for carrying out borehole strain observation of earthquakes,volcanoes and plate boundaries.Using a two-ring model and the complex variable function method to calculate the c （area strain response coefficient） and d （shear strain response factor）,A and c,B and d have a relationship as c=2A,d=2B.And the variation curves are identical.Their physical meanings are respectively the crust rock area strain and shear strain observation borehole coupling coefficient.

关 键 词：分量式钻孔应变 双衬套模型 耦合系数 响应因子 

分 类 号：P315[天文地球—地震学]