基于中国西部构造应力分区的川藏铁路沿线地应力的状态分析与预估

doi:10.13722/j.cnki.jrme.2019.0624

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Abstract Analysis and prediction of stress fields along the Sichuan—Tibet railway area is of important significance and high application value. Combining the tectonic stress field zoning，geomechanical trace analysis method and Anderson?s theory of faulting mechanics，the stress orientations along the new Sichuan-Tibet railway area were analyzed based on the databases from WSM and Crustal Stress Database of China Mainland. The strength of rock masses in the engineering area was estimated by using Hoek-Brown criterion，the stress magnitudes of this area were predicted by the modified Sheorey model，and consequently，the stress state and potential high stress were comprehensively evaluated. The results show that the regional dominant orientation of SH is NE while that the orientation of the stress field varies around the Namche Barwa Terrane，Eastern Himalayan Syntaxis and the northeastern margin of the Qinghai—Tibet Plateau. The dominant orientation of SH near Eastern Himalayan Syntaxis is NNW–NEE，and the range of the orientation is 20°–140° at the northeastern margin of the Qinghai—Tibet Plateau. The predicted results indicate that the maximum and minimum horizontal principal stresses at a burial depth of 1 000 m along the new Sichuan-Tibet railway are respectively up to 26.19–38.41 MPa and 13.88–21.81 MPa and，at a burial depth up to 2 500 m，are 66.44–86.48 and 35.02–49.11 MPa respectively. It is also pointed out that，under such high stress，brittle failure or rock bust of hard rock and large deformation of soft rock would occur in the case of the overburden over 1 000 m. According to an application case，the proposed method works well combined with the databases and limited stress measurement results.

Key words： geomechanics Sichuan&mdash Tibet railway stress state tectonic stress stress division stress prediction

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	WANG Chenghu
	GAO Guiyun
	YANG Shuxin
	YAO Rui
	HUANG Luyuan

Cite this article:

WANG Chenghu,GAO Guiyun,YANG Shuxin, et al. Analysis and prediction of stress fields of Sichuan—Tibet railway area based on contemporary tectonic stress field zoning in Western China[J]. , 2019, 38(11): 2242-2253.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0624 OR http://www.rockmech.org/EN/Y2019/V38/I11/2242

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