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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

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文章编号:1672-7029(2015)05-1088-08
四川“Y字形”断裂交汇部应力场反演分析
王敏杰,李天斌,孟陆波,唐浩

(成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都 610059)

摘 要: 以四川地区地应力实测资料为基础,采用地质过程数值模拟的三维有限元数值分析方法,对四川省“Y字形”断裂交汇部区域应力场进行反演分析,得到四川省“Y字形”断裂交汇部周围地区不同埋深的地应力分布情况及数值大小。区域最大水平主应力总体为NW向,但中部、东北侧部分区域有NE向出现。本区内埋深500 m最大水平应力为12.5~15 MPa,1 000 m最大水平应力为26~30 MPa,1 500 m最大水平应力为38~44 MPa,2 000 m最大水平应力为50~57.5 MPa。同时,在前人对四川省地应力3个大区分区的基础上,根据反演得到的区域地应力大小及方向,又将“Y字形”区域各分为2~3个亚区,为该区域其他公路、铁路以及隧道工程的选线提供了参考资料。

 

关键字: 数值模拟;地应力反演; FLAC3D;交通选线;地应力分区

Back analysis of stress field in the intersection region of Y shaped fault,Sichuan
WANG Minjie, LI Tianbin, MENG Lubo, TANG Hao

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

Abstract:This article utilizes the numerical simulation on geological process of 3D finite element numerical simulation analysis to conduct a back analysis of stress field in the intersection region of Y shaped fault. And the distribution and magnitude of in-situ stress in different depth around the intersection are as follows: the regional maximum horizontal principal stress is overall along the orientation of NW, although in some parts of middle and northeast seems to be NE. The region maximum horizontal tectonics stress is 12.5-15 MPa at the depth of 500 m, 26-30 MPa at the depth of 1 000 m, 38-44 MPa at the depth of 1 500 m and 50-57.5 MPa at the depth of 2 000 m. At last, based on the 3 stress zones divided by previous scholars, and the results of orientation and magnitude, we divide each main zone into 2 or 3 subregions, making it a reference for line selection of highway, railway and tunnels in this area.

 

Key words: numerical simulation; back analysis of in-situ stress; FLAC3D; traffic line selection; stress zoning

ISSN 1672-7029
CN 43-1423/U

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