| 岩体裂隙充水后对拐角频率的影响 |
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| 引用本文： | 姚立珣,钟羽云,张震峰,杨钢宇.岩体裂隙充水后对拐角频率的影响[J].西北地震学报,2004,26(4):315-321. |
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| 作者姓名： | 姚立珣 钟羽云 张震峰 杨钢宇 |
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| 作者单位： | 浙江省地震局,浙江,杭州,310013 |
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| 基金项目： | .浙江省重点科研项目(991103263) |
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| 摘 要： | 2002年在浙江温州的珊溪水库发生了一系列水库诱发地震，其拐角频率明显小于同震级的构造地震。本从二相介质理论出发，讨论了水库岩体在扩容、流体渗入饱和和强度弱化过程中波速和波速比的变化以及对拐角频率的影响。根据实验结果，当孔隙度为0．15，岩体弹性模量减小23％时，拐角频率可以减小约29％。由此解释了水库诱发地震拐角频率偏小主要是由裂隙发育和库水渗透扩散使地壳浅部岩体强度弱化引起的。因此拐角频率可以作为区别两的一个依据。
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| 关 键 词： | 水库诱发地震 二相介质 岩体弱化 拐角频率 |
| 文章编号： | 1000-0844(2004)04-0315-07 |
| 收稿时间： | 2003/4/5 0:00:00 |
| 修稿时间： | 2004年4月5日 |
INFLUENCE OF IMPREGNATED ROCK MASS ON THE CORNER FREQUENCY |
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| YAO Li-xun,ZHONG Yu-yun,ZHANG Zhen-feng and YANG Gang-yu.INFLUENCE OF IMPREGNATED ROCK MASS ON THE CORNER FREQUENCY[J].Northwestern Seismological Journal,2004,26(4):315-321. |
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| Authors: | YAO Li-xun ZHONG Yu-yun ZHANG Zhen-feng and YANG Gang-yu |
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| Institution: | Seismological Bureau of Zhejiang Province, Hangzhou 310013, China,Seismological Bureau of Zhejiang Province, Hangzhou 310013, China,Seismological Bureau of Zhejiang Province, Hangzhou 310013, China and Seismological Bureau of Zhejiang Province, Hangzhou 310013, China |
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| Abstract: | In 2002,a reservoir induced earthquake sequence took place in Shanxi reservoir,Wenzhou city,Zhejiang province.The corner frequencies of the earthquakes were prominently less than that of tectonic earthquakes.Based on the theory of wave propagation in two phases medium,the variations of wave velocity, v_p/v_s ratio and the influence on corner frequency in the process of dilatancy-diffusion, saturation with water and strength weakness of rock mass are discussed.According to some experiment results if the porosity is 0.15 and the elasticity modulus of rock decreases 23%, the corner frequency can decrease about 29%.It indicates that the corner frequency of the reservoir-induced earthquake decreasing is caused by fracture growing and infiltration diffusion of water,which lead to the strength weakness of rock mass.Thus the corner frequence may be used as a criterion for distinguishing the reservoir-reduced earthquakes from the tectonic earthquakes. |
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| Keywords: | Reservoir-reduced earthquake Two phases medium Weakness of rock mass Corner frequency |
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