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本实验目的是揭示受力岩石中应力与电阻率的关系,以验证形变电阻率法能否用于地震预报工作。 实验在一离地面深100多米、正在开采的矿坑中进行。视电阻率的测量用四极对称装置,干电池供电,最高电压13.5伏,最大观测均方误差为1—2％。五个测点上贴了电阻丝应变片,以测定岩石主应变的大小、方向以与视电阻率极大值进行对比。应变计的读数值最大误差不超过3—4με。实验中考虑了岩石有严重极化现象的影响。 实验的初步结果表明:岩石的视电阻率和应变值的变化,总趋势相当一致,所以用形变电阻率法来测量应变是极有希望的。对1973年在四川省南坪发生的几次地震进行震例分析的结果,得到同样的结论。 文中对实验中存在的问题,也作了一些讨论。
The purpose of this experiment is to reveal the relationship between stress and resistivity in stressed rock to verify whether the deformation resistivity method can be used for earthquake prediction. Experiments in a more than 100 meters deep from the ground, mining mines are being carried out. Apparent resistivity measurements using a four-pole symmetrical device, dry battery-powered, the maximum voltage of 13.5 volts, the maximum observed mean square error of 1-2%. Strain gauges were attached to the five measuring points to determine the size and direction of the principal strain of the rock in comparison with the maximum apparent resistivity. Strain gage readings should not exceed the maximum error of 3-4με. The experiment considered the influence of serious polarization of rock. The preliminary results of the experiment show that the overall trend of apparent resistivity and strain value of rock is quite consistent, so it is very promising to use the strain-rate method to measure the strain. The same conclusion was obtained from the earthquake case analysis of several earthquakes that occurred in Nanping, Sichuan Province in 1973. The article also made some discussions on the problems existing in the experiment.