山东地区现今地应力场特征与应力积累水平分析

doi:10.13722/j.cnki.jrme.2017.0298

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摘要山东地区地质构造环境十分复杂，历史上曾多次发生中强地震及强震。为深入了解该地区现今构造应力场特征及区域地壳应力积累水平，基于优化处理后的181组地应力实测数据，采用回归分析法全面分析了该地区地应力量值随深度的分布特征，并依据地壳应力积累理论，探讨了区域应力积累水平和地壳稳定性。结果表明，该地区地应力状态主要以?H＞?h＞?v型和?H＞?v＞?h型为主，应力状态类型与深度有一定关系；3个主应力?H，?h和?v均随深度呈近似线性增加的关系，应力变化梯度值分别为0.024 2，0.018 0，0.025 8；3个侧压系数KH，Kh和Kav随深度呈近似双曲线分布，随着深度的增加分别向1.46，0.89，1.17趋近；水平差应力相对大小μd更接近于线性分布，随着深度的增加趋向于0.24；最大水平主应力优势方向整体表现为NWW-SEE向，但NEE-SWW向也占有较大比例，优势方位统计结果与世界应力图2016及板块间作用相吻合；沂沭断裂带西侧区域最大水平主应力优势方向整体呈NEE-SWW向，而其东侧区域整体呈NWW-SEE向。?m能较好地反映地壳应力积累能力，?m值主要集中在0.3～0.5，0.2～0.3范围内，该地区的应力积累水平整体上处于中低程度，地壳浅层处于相对稳定状态。逆断型应力状态的?m值主要集中在0.2～0.3范围内，应力积累水平以较低程度为主；走滑型应力状态的?m值主要集中在0.3～0.5范围内，应力积累水平以中等程度为主。

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	李鹏1
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	郭奇峰1
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	刘洪涛1
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	蒋晓琴1
	2

关键词 ：岩石力学, 山东地区, 地质构造, 地应力场特征, 地壳应力积累理论, 应力积累水平, 地壳稳定性

Abstract：Shandong region has complex geological environment and there have been several moderate-strong and strong earthquakes in the history of the region. In order to study the present state of tectonic stress field and the accumulated regional crustal stress level in detail，the characteristics of the ground stress distribution along depth were analyzed with the method of regression analysis，and the accumulated stress level and crustal stability of the region were discussed in accordance with the accumulated crustal stress theory based on the 181 sets of measured in-situ stress data after optimization. The results show that there are mainly two types of in-situ stress states，one is ?H＞?h＞?v and the other is ?H＞?v＞?h，and the type of in-situ stress state is related to the depth. The principal stresses ?H，?h，and ?v increase approximately linearly with depth，and the stress gradients are 0.024 2，0.018 0，and 0.025 8 respectively. The lateral pressure coefficients KH，Kh，and Kav vary approximately hyperbolically with the increase of depth and approach to 1.46，0.89，and 1.17 respectively. The ratio of the half of the maximum horizontal differential stress to the average horizontal principal stress ?d varies linearly with the increase of depth，and approaches to the value of 0.24. The dominant orientation of the maximum horizontal principal stress in the region is overall in NWW-SEE direction，yet a large proportion is in the NEE-SWW direction. The statistical results of the dominant orientation coincide with the World Stress Map 2016 and the interaction of the plates. The dominant orientation of the maximum horizontal principal stress in the west side of the Yishu fault zone is in the direction of NEE-SWW，and that in the east side of it is in NWW-SEE direction. ?m reflects the crustal stress accumulation in the studied area well，and is mainly in the range of 0.3–0.5 and 0.2–0.3. The stress accumulation in this region is in the moderate and low level，and the shallow crust is in a relatively stable state. The values of ?m of the thrust stress state are in the range of 0.2 to 0.3，and the accumulated stress levels are low largely，while the values of ?m of the strike-slip stress state are in the range of 0.3 to 0.5，the accumulated stress level is moderate mainly.

Key words： rock mechanics Shandong region geological structure characteristics of the in-situ stress field accumulated crustal stress theory accumulated stress level crustal stability

引用本文:

李鹏1，2，郭奇峰1，2，刘洪涛1，2，蒋晓琴1，2. 山东地区现今地应力场特征与应力积累水平分析[J]. 岩石力学与工程学报, 2017, 36(9): 2220-2231.
LI Peng1，2，GUO Qifeng1，2，LIU Hongtao1，2，JIANG Xiaoqin1，2. Characteristics of current in-situ stress field and stress accumulation in Shandong region. , 2017, 36(9): 2220-2231.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0298 或 http://www.rockmech.org/CN/Y2017/V36/I9/2220

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