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地质力学学报:1999,5(1):87-91
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利用定向岩心进行AE法原地应力测量
(中国地震局地壳应力研究所, 北京 100085)
INSITU STRESS MEASUREMENT BY A METHOD USING ORIENTED CORE
(Institute of Crustal Dynamics, CSB. Beijing 100085)
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投稿时间:1998-03-15    
中文摘要: 在北京市房山区迎风坡花岗闪长岩300m深钻孔中,采用以水泥端帽法为主的岩心定向技术,并在钻进和取心过程中采取特殊措施,在钻孔中距地表25m~301m整个深度段内取得了直径86mm的定向岩心。对深度294m的定向岩心进行了声发射Kaiser效应试验。岩石试件为圆柱形,直径30mm,高度75mm.在垂直方向,利用声发射Kaiser效应估计的垂直主应力为7.7MPa;在294m岩体静岩压力为7.9MPa;两者基本相同。在水平面内,对4个方向的试件进行声发射Kaiser效应试验,得到相应的各个方向的压应力,由此估算的水平最大和最小主应力分别为21.2MPa和12.1MPa.水平面内最大主应力的方向基本为SN方向。将声发射Kaiser效应测量结果与水压致裂法的测量结果进行对比,二者具有很好的一致性。
中文关键词: 声发射  Kaiser效应  地应力  定向岩心
Abstract:A borehole was drilled in granodiorite rockmass at Fangshan, Beijing, China. The depth of the borehole is 301m with diameter of 110mm. From about 30m to 301m, all cores were oriented by cement end cap method. AE Kaiser effect tests on oriented core at depth of 294m were carried out. The rock specimens are the cylinders with 30mm diameter and 75mm height. In vertical direction, the vertical stress estimated by AE Kaiser effect tests is 7.7 MPa. The lithostatic pressure at the depth of 294m in granodiorite rockmass is 7.9 MPa. Both of them are almost same. In horizontal plane, for four directions rock specimen, AE Kaiser effect tests were carried out and their corresponding normal stresses were gotten. The horizontal maximum and minimum principal stresses are 21.2 MPa and 12.1 MPa respectively. The orientation of horizontal maximum principal stress is about the NStrending. Comparing the result of AE Kaiser effect tests with hydrofracturing shows that they are consistent fundamentally.
文章编号:     中图分类号:TU459.4    文献标志码:
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引用文本:
李宏,陈景崧,江南生,等,1999.利用定向岩心进行AE法原地应力测量[J].地质力学学报,5(1):87-91.DOI:
LI Hong,CHEN Jingsong,JIANG Nansheng,et al,1999.INSITU STRESS MEASUREMENT BY A METHOD USING ORIENTED CORE[J].Journal of Geomechanics,5(1):87-91.DOI:

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