| 不同三轴应力条件下岩石电阻率变化的试验研究 |
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| 引用本文： | 张金铸,陆阳泉.不同三轴应力条件下岩石电阻率变化的试验研究[J].地震学报,1983,5(4):440-445. |
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| 作者姓名： | 张金铸 陆阳泉 |
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| 作者单位： | 1. 水电部中南勘测设计院科研所
2. 国家地震局兰州地震研究所 |
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| 摘 要： | 作者试验研究了在不同三轴应力条件下,饱水砂岩的电阻率变化与施加应力的方式及应变积累速率的关系.试验方式为开始在一定的静水压力下,保持最小主应力（3）不变,考察了两种应力积累过程:1.以快速——慢速——最快速三种加载速率施加最大主应力（1）,中间主应力（2）称之谓 Ⅰ 型;2.以慢速——快速——恒压——最快速四种加载速率施加1、2称之谓Ⅱ型.两种应力过程的1、2,均加至破强度的80——90%后,再快速卸载至原静水压.同时,其应变速率控制在10-6——10-7/秒范围内.实验结果与某些大地震前后的一些地电变化的实测记录相吻合.从而揭示了地震前后视电阻率异常的阶段性变化特征,可能与地震在孕育过程中应变能的积累方式、应变速率、能量释放（地震活动）等因素相关联.为实测电阻率的前兆现象（地电异常）的理论解释提供了实验基础.
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AN EXPERIMENTAL STUDY ON THE VARIATION OF ROCK RESISTIVITY UNDER TRIAXIALLY DIFFERENT STRESSES |
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| Affiliation: | 1. South-Central Institute of Planning and Designing, Ministry of Hydro-electric Engineering;
2. Institute of Seismology of Lanzhou, State Seismological Bureau |
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| Abstract: | This paper deals with the relation between resistivity change with the form of the loading procedure and strain accumulation rate of a moist saturated sandstone sample, under triaxially different stresses. In the test, the sample was loaded at first by a certain hydrostatic pressure, keeping the minimum principal stress 3 constant, then two types of loading procedures were examined.Type Ⅰ: Loading of the maximum principal stress 1 and the intermediate principal stress2 in three rates, quick, slow and very quick.TypeⅡ: Loading of 1 and 2 in four stress rates, slow, quick, steady and very quick.During the experiment, 1 and 2 were loaded up to the stress level about 80-90% of the failure strength of the rock sample, then unloaded immediately to the initial hydro-static stress level. At the same time, the change of strain rate was limited to the range of 10-6-10-7 per second.The results obtained agree fairly well with the observations in-situ before and after some major earthquakes. They reveal the phenomenon of apparent resistivity variation by stages, before and after an earthquake, probably relating to the manner of accumulation of strain energy, strain rate and energy release in the development of the earthquake source. So the experimental results may provide basis for theoretical explanation for the earth resistivity variation before an earthquake. |
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