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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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

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	Articles by authors
	LI Peng1
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	GUO Qifeng1
	2
	LIU Hongtao1
	2
	JIANG Xiaoqin1
	2

Cite this article:

LI Peng1,2,GUO Qifeng1, et al. Characteristics of current in-situ stress field and stress accumulation in Shandong region[J]. , 2017, 36(9): 2220-2231.

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

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