广西盆地东北部的地应力分布特征

doi:10.13722/j.cnki.jrme.2016.0721

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Abstract

Guangxi section of high-speed railway from Guiyang to Guangzhou，located in the northeast part of Guangxi basin，is the high-speed channel to link“the Belt and Road”. In order to explore the in-situ stress state of project district and provide basic data for the design of tunnels，the hydraulic fracturing stress measurements of 8 boreholes in 5 different regions were carried out in the northeast of Guangxi Basin. The result shows that the direction of the maximum horizontal principal stress presents NNW-NWW，which is consistent with the regional tectonic stress field. The grade coefficients of the maximum，minimum horizontal principal stresses are smaller than the average in situ stress gradient of China. The relative size of triaxial principal stress at the depth over 300 m tends to S_H＞S_h＞S_v which is prone to reverse faulting；the relative size of tri-axial principal stress at the depth below 300 m tends to S_H＞S_v＞S_h which is prone to strike-slip faulting. The value of lateral pressure coefficient and m_m(the ratio of the maximum shear stress to the average principal stress) in the measured area indicates that the fault in measured area is in a steady state，which also shows that the northeast part of Guangxi basin is the area with stable structure.

Key words： geomechanics guangxi basin crustal stress sate Byerlee?s law fault slip stability lateral pressure coefficient

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	Articles by authors
	LI Bing1
	2
	3
	LI Bingyan4
	ZHANG Ce1
	2
	WANG Jianxin1
	2
	LI Cong5
	GUO Qiliang1
	2

Cite this article:

LI Bing1,2,3, et al. Distribution characteristics of the crustal stress in the northeast of Guangxi Basin[J]. , 2017, 36(S1): 3475-3485.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0721 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3475

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