| 华北地区地应力测量 |
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| 引用本文： | 李方全,王连捷.华北地区地应力测量[J].地球物理学报,1979,22(1):1-8. |
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| 作者姓名： | 李方全 王连捷 |
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| 作者单位： | 1. 国家地震局地震地质大队;
2. 地质科学研究院地质力学研究所 |
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| 摘 要： | 本文首先叙述了地应力测量的原理和方法,包括应力计的结构、应力解除技术、室内模拟试验和观测可靠性的检验等。 在华北地区采用应力解除方法进行了地应力绝对值的测量。虽然测量大都是在地表以下30米内的浅部进行的,各测点最大主应力的方向也不完全一致,但从整个大区域来看,华北地区地应力场的主导方向为北西西到近东西方向的压应力。 大震后在震中区测得的应力值比离震中较远处测得的应力值要低。这可能反映了地震过程中的应力释放和震后应力的调整。
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| 关 键 词： | 地应力测量 华北地区 奥陶系灰岩 测量元件 应力解除槽 最大主应力 压磁应力计 测量结果 地质力学 滦县 |
| 收稿时间： | 1978-02-22 |
STRESS MEASUREMENTS IN NORTH CHINA |
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| LI FANG-QUAN,WANG LIAN-JIE.STRESS MEASUREMENTS IN NORTH CHINA[J].Chinese Journal of Geophysics,1979,22(1):1-8. |
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| Authors: | LI FANG-QUAN WANG LIAN-JIE |
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| Institution: | 1. Seismotectonic Brigade, State Seismological Bureau;
2. Institute of Geomechanics, Chinese Academy of Geological Sciences |
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| Abstract: | At first, the authors describe here the principle and method of measuring the ground stress, including the construction of the stress guage employed, the technique of over-coring, laboratory model experiments, testing of the dependability of the stress measurements.In North China we used the method of over-coring to determine the absolute value of the ground stress. Although the observation was always made at a depth of less than 30 meters and the directions of the maximum principal stress are not entirely the same at each locality, but in considering the North China Region as a whole, the ground stress fieldis compressive and the predominant direction of its principal stress is NWW to EW.The absolute stress value determined within the epicentral region of a strong earthquake is usually less than that of the region outside it. It may indicate the process of stress release and adjustment of the stress field during the strong ear-thquakes. |
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