CHEN DAYUANup, CHEN FENGup, HE GUOYUup2. 1987: INFLUNCES OF STRESS REVERSAL ON ROCK RESISTIVITY DURING LOADING PROCEDURE. Acta Seismologica Sinica, 9(3): 303-311.
Citation: CHEN DAYUANup, CHEN FENGup, HE GUOYUup2. 1987: INFLUNCES OF STRESS REVERSAL ON ROCK RESISTIVITY DURING LOADING PROCEDURE. Acta Seismologica Sinica, 9(3): 303-311.

INFLUNCES OF STRESS REVERSAL ON ROCK RESISTIVITY DURING LOADING PROCEDURE

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  • Published Date: September 01, 2011
  • The properties of rock resistivity were studied under pressure, particularly with stress reversal procedure, in which the applied pressure was increased, decreased, and increased again.It was observed that, 1) with pressure increasing, the main feature of the resistivity changes was increase-steady-decrease for high saturation rock samples (saturation 71-100%). But the main feature for low saturation samples was different (resistivity increased). 2) In 10 out of 11 cases for high saturation samples the resistivities droped remarkably (about 2%). These drops could explain the negative anomalies commonly observed in geoelectricity surveys, before earthquakes in China. 3) It was also observed shortly before rock failure that, a) The resistivity drops much more dramatically in the stress reversal period, about 20% more than ordinary drops, b) These drops occured not only during stress decrease but also during stress increase, c) The anisotropic property of resistivity change is enhanced. 4) Resittivity increase was observed during the stress reversal period for low saturation rock samples.The results mentioned above were explained with the effect of water flowing in and out of the cracks of rocks. Temporary factors, which bring about a reduction of the main stress, may enhance the possibility of earthquake occurrence.
  • [1] 耿乃光,应力减小引起地震,地震学报,7,445——451,1985,

    [2] 陈大元、陈峰、王丽华、贺国玉、戴经安,单轴压力下岩石电阻率的研究—电阻率的各向异性,地球物理学报,26,784——792,1983.

    [3] 北京大学地球物理教研室、中国科学院地质所三室,岩石的结构、成份与它在单向压力下电阻率变化的初步研究,地震战线,1973,4: 9——15,

    [4] 钱复业、赵玉林,地震前地电阻率变化十例,地震学报,2} 186——197,1980,

    [5] 赵玉林、钱复业,唐山7.8级强震前震中周围形变电阻率的下降异常,地球物理学报,21,181——182,1978,

    [6] Ф.П.萨瓦连斯基,工程地质手册,135地质出版社翻译1959第一版.

    [1] 耿乃光,应力减小引起地震,地震学报,7,445——451,1985,

    [2] 陈大元、陈峰、王丽华、贺国玉、戴经安,单轴压力下岩石电阻率的研究—电阻率的各向异性,地球物理学报,26,784——792,1983.

    [3] 北京大学地球物理教研室、中国科学院地质所三室,岩石的结构、成份与它在单向压力下电阻率变化的初步研究,地震战线,1973,4: 9——15,

    [4] 钱复业、赵玉林,地震前地电阻率变化十例,地震学报,2} 186——197,1980,

    [5] 赵玉林、钱复业,唐山7.8级强震前震中周围形变电阻率的下降异常,地球物理学报,21,181——182,1978,

    [6] Ф.П.萨瓦连斯基,工程地质手册,135地质出版社翻译1959第一版.
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