| 钻孔对初始应力场扰动影响的初步研究 |
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| 引用本文： | 孙礼健,朱元清,尹纪尧.钻孔对初始应力场扰动影响的初步研究[J].西北地震学报,2009,31(2):131-135. |
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| 作者姓名： | 孙礼健 朱元清 尹纪尧 |
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| 作者单位： | 1. 中国地震局地球物理研究所,北京100081;上海市地震局,上海200062
2. 上海市地震局,上海,200062 |
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| 基金项目： | 上海市综合深井地震观测系统建设项目，地震科学联合基金，上海市地震局地震科技发展基金 |
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| 摘 要： | 地应力测量是获得初始地应力最直接最有效的方法,但在地应力测量打钻的过程中初始地应力会遭到扰动,岩体在打钻后出现卸载现象,初始地应力重新分布,使得测量值与实际初始地应力值有差别.本文应用有限元方法对钻孔地应力测量过程进行模拟,重点研究岩体的性质、边界应力、断裂在钻孔过程中对初始地应力变化的影响,并总结影响初始地应力变化的敏感因素.
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| 关 键 词： | 初始地应力 钻孔 有限元 岩石性质 断裂 |
Primary Analysis on the Disturbances of Drilling to Initial Geostress Field |
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| SUN?Li-jian,ZHU?Yuan-qing and YIN?Ji-yao.Primary Analysis on the Disturbances of Drilling to Initial Geostress Field[J].Northwestern Seismological Journal,2009,31(2):131-135. |
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| Authors: | SUN?Li-jian ZHU?Yuan-qing and YIN?Ji-yao |
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| Institution: | Institute?of?Geophysics,?China?Earthquake?Administration;Earthquake?Administration?of?Shanghai;;Earthquake?Administration?of?Shanghai;;Earthquake?Administration?of?Shanghai; |
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| Abstract: | Geostress measurement is a direct and effective way to get initial geostress. But initial geostress is disturbed in drilling, it exists the phenomenon of stress relief and stress redistributing after drilling, that makes the measuring value different from the actual value of the initial geostress. In this paper, the process of geostress measurement in borehole is simulated by using finite element method, the effects of rock property, stress border and fractures on geostress changes are studied, and the sensitive factors to initial geostress changes are summarized. |
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| Keywords: | Initial geostress Drilling Finite element Rock property Fractures |
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