四分量钻孔应变观测的实地绝对标定

Absolute calibration of 4-component borehole strainmeters

钻孔应变观测的实地标定问题有二层涵义:在第一个层面上,可以认为实地标定是相对室内标定而言的,是对仪器(元件)灵敏度的标定,称为相对标定;在第二个层面上,由测值换算出孔径相对变化以后,还要利用理论固体潮等依据对与钻孔周围介质的弹性有关的参数进行标定,从而给出应变变化,称为绝对标定。文中提出了四分量钻孔应变观测的绝对标定的新方法,并以昌平台RZB-1型钻孔应变观测为例进行实际应用,取得了相当好的结果。

Two level of in-situ calibration of borehole strainmeters is identified. At the first level, in-situ calibration is distinguished from laboratory calibration. It needs to determine the same thing, the transducer＇s factor. It is referred as relative calibration. At the second level, since local strains cannot be calculated until elastic parameters of surrounding medium are given, in-situ calibration also includes the task for determining these parameters by the known data such as earth tide. This is referred to the absolute calibration. In this paper, a new method for absolute calibration of 4-component strainmeter is put forward with a case study on the observations of Changping station in which good results have been obtained.