| 基于原地应力测量数据的中国大陆地壳上部应力状态研究 |
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| 引用本文： | 王艳华,崔效锋,胡幸平,谢富仁.基于原地应力测量数据的中国大陆地壳上部应力状态研究[J].地球物理学报,2012,55(9):3016-3027. |
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| 作者姓名： | 王艳华 崔效锋 胡幸平 谢富仁 |
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| 作者单位： | 1. 中国地震局地壳应力研究所地壳动力学重点实验室, 北京 100085;2. 江苏省地质勘查技术院, 南京 210008 |
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| 基金项目： | 深部探测技术与实验研究专项，国家科技支撑计划课题 |
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| 摘 要： | 在两个水平主应力随深度呈线性增加的前提下,通过数学推导,建立了侧压系数、水平最大与水平最小主应力之比(σH/σh)以及剪应力相对大小μm等应力参数随深度变化的关系式.在此基础上,依据中国大陆1780条二维水压致裂和应力解除的原地应力测量数据,对多个应力参数随深度的变化进行了回归分析.结果显示,中国大陆地壳浅部的侧压系数随深度的变化呈完整的双曲线形态,通过稳定性检验说明,即使缺少较深的原地应力实测数据,只要有一定数量的测试深度超过1500 m的数据,仍然可以得到比较可信的侧压系数回归分析结果,在整个脆性上地壳的物性参数没有本质变化的前提下,可以利用地壳浅部的侧压系数回归分析结果推断脆性上地壳的2个水平主应力的取值范围;相对于侧压系数,在中国大陆地表以下几千米深度范围内,σHH/σ和μm的变化不大,更接近线性分布,σH/σh的拟合值在1.5左右,μm的拟合值在0.2左右,并且μm的线性集中程度更好.利用μm的大小来判断活动断裂的地震危险性具有一定合理性.
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| 关 键 词： | 中国大陆 地壳应力 侧压系数 剪应力相对大小 回归分析 稳定性检验 |
| 收稿时间： | 2011-03-21 |
Study on the stress state in upper crust of China mainland based on in-situ stress measurements |
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| WANG Yan-Hua
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CUI Xiao-Feng
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HU Xing-Ping
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XIE Fu-Ren.Study on the stress state in upper crust of China mainland based on in-situ stress measurements[J].Chinese Journal of Geophysics,2012,55(9):3016-3027. |
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| Authors: | WANG Yan-Hua CUI Xiao-Feng HU Xing-Ping XIE Fu-Ren |
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| Institution: | 1. Key Laboratory of Crustal Dynamics, The Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;2. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210008, China |
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| Abstract: | On the condition that two horizontal principal stresses increase linearly with depth, expressions of stress parameters with depth, including the lateral pressure coefficients, the ratio of maximum and minimal horizontal principal stress (σH/σh), the ratio of maximum shear stress and average horizontal stress (μm), are given using a mathematical method. Then, the variations of stress parameters with depth are calculated by a fitting method according to 1780 two-dimensional in-situ stress measurements of hydraulic fracturing and overcoring. The results show that the changes of lateral pressure coefficients with depth display a hyperbolic shape in shallow crust of China mainland. The stability test indicates that even lacking deep in-situ stress data, the reliable fitting results of lateral pressure coefficients can still be obtained as long as a certain number of measurements with the least depth of 1500 meter are utilized. Under the premise that the physical parameters do not change essentially in the brittle upper crust, the range of two horizontal principal stresses can be deduced by the analysis of lateral pressure coefficients. σH/σh (about 1.5) and μm (about 0.2), especially μm, which are more stable and closer to linear distribution. It is reasonable to assess the seismic risk of active faults by using μm. |
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| Keywords: | China mainland Curst stress Lateral pressure coefficient Ratio of maximum shear stress and average horizontal stress Fitting analysis Stability test |
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