| 基于岩饼几何形态测量的原地应力测定方法 |
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| 引用本文： | 李彦恒,谭可可,冯利.基于岩饼几何形态测量的原地应力测定方法[J].岩土力学,2012,33(Z2):224-0228. |
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| 作者姓名： | 李彦恒 谭可可 冯利 |
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| 作者单位： | 第二炮兵工程设计研究院，北京 100011 |
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| 摘 要： | 岩饼是工程区高地应力的标志之一，其形状与主应力的大小和方向直接相关，岩饼出现时刻通常的应力解除法不能再用 于原地应力测量。根据国内外众多学者多年来对岩饼现象的研究成果，提出一种根据岩饼的几何形态测量初步计算三维地应力的方法。经实践验证，与同一工程区其他地应力测量方法的结果相比，岩饼几何形态测量方法确定出三维地应力的方向相差不大，倾角差值在10°以内，方位角之差小于20°，主应力大小满足岩饼出现的条件，具有简便实用的优点。
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| 关 键 词： | 高地应力 岩芯饼化 应力解除法 岩饼外沿高度曲线 临界拉应力系数 |
| 收稿时间： | 2012-02-16 |
Estimation of in situ geostress states from measuring shape of disked core |
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| LI Yan-heng,TAN Ke-ke,FENG Li.Estimation of in situ geostress states from measuring shape of disked core[J].Rock and Soil Mechanics,2012,33(Z2):224-0228. |
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| Authors: | LI Yan-heng TAN Ke-ke FENG Li |
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| Institution: | Engineering Design & Research Institute of The Second Artillery Corps, Beijing 100011, China |
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| Abstract: | Core disking is one of indicators of elevated geostress magnitude. The shape of disked cores is directly subjected to values and directions of three principal stresses. In the case of drilling-induced core disking, 3D geostress states cannot be measured by usual overcoring methods. Based on the previous studies of core disking, we provide a convenient substituted measurement of 3D geostresses by determining the geometry of disked core’s surface. Practically, the directions of three principal stresses from our method are quite close to those from other measurement in the vicinal site. The differences of inclination are in the range of 10°; and those of azimuth less than 20°. Moreover, the magnitudes of principal stresses satisfy the well-known condition to cause core disking. |
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| Keywords: | high geostress core disking overcoring methods height distribution at the periphery of disked core critical tensile stress coefficients |
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