| 关于在土层中进行钻孔应变观测的可行性问题 |
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| 引用本文： | 邱泽华.关于在土层中进行钻孔应变观测的可行性问题[J].大地测量与地球动力学,2010,30(Z2). |
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| 作者姓名： | 邱泽华 |
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| 作者单位： | 中国地震局地壳应力研究所; |
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| 基金项目： | 中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项，国家质量监督检验检疫总局行业专项 |
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| 摘 要： | 在土层中开展钻孔应变观测实验是地球动力学以及地震预报研究的需要.能否观测到固体潮对该实验的成功与否起决定作用.土层与岩层的主要区别是其疏松性.由此造成的压密永久变形问题,可以通过在适当深处以下安装探头来解决.同时,因为土在小变形动态载荷下呈现弹性,而固体潮应变变化量级为10-8左右,所以探头并不需要安装在太深的地方.理论分析的结果是,虽然钻孔应变仪在土层中观测应变变化的灵敏度小于岩层,但是因为在相同的应力下,土层弹性变形比岩层大得多,所以在整体效果上是有利于在土层中观测到固体潮的.孔隙水的变化会给钻孔应变观测带来严重干扰,钻孔应变探头的深度应该避开地下水位变动范围.如何能在土层中观测到固体潮,最终需要通过实验来说明.
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| 关 键 词： | 钻孔应变仪 钻孔应变观测 固体潮 土层应变观测 土体变形 |
DISCUSSION ON FEASIBILITY OF BOREHOLE STRAIN OBSERVATION IN SOIL |
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| Qiu Zehua.DISCUSSION ON FEASIBILITY OF BOREHOLE STRAIN OBSERVATION IN SOIL[J].Journal of Geodesy and Geodynamics,2010,30(Z2). |
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| Authors: | Qiu Zehua |
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| Institution: | Qiu Zehua(Institute of Crustal Dynamics,CEA,Beijing 100085) |
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| Abstract: | Tests for observing strain changes in soil with borehole strainmeters are needed in researches of earthquake forecast as well as geodynamics.The observation can be testified if solid earth tides will be clearly recognized.The difference of observation in soil from in rocks lies on the looseness of the medium.Therefore,the strainmeter should be placed significantly deeper in order to solve the problem of permanent deformation.Meanwhile,since soil responds elastically to small dynamic deformation,and the tide... |
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| Keywords: | borehole strainmeter borehole strain observation Earth tide strain observation in soil soil deformation |
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