上海交通大学学报(自然版) ›› 2013, Vol. 47 ›› Issue (09): 1399-1403.

• 建筑科学 • 上一篇    下一篇

基于地应力实测值的断层构造区域地应力场有限元回归反演分析

王颖轶1,李科2,黄醒春1   

  1. (1.上海交通大学 海洋水下工程科学研究院, 上海 200240; 2.招商局重庆交通科研设计院有限公司 公路隧道建设技术国家工程实验室,隧道建设与养护技术交通行业重点实验室, 重庆 400067)
     
  • 收稿日期:2012-12-15 出版日期:2013-09-28 发布日期:2013-09-28

Finite Element Method Regression Back Analysis of Initial Stress Field in a Large Underground Chamber Area

WANG Yingyi1,LI Ke2,HUANG Xingchun1
  

  1. (1. Chinese Underwater Technology Institute, Shanghai Jiaotong University, Shanghai 200240, China; 2. National Engineering Laboratory for Highway Tunnel Construction Technology, Key Laboratory of Tunnel Construction and Maintenance Technology of the Communication Ministry, China Merchants Chongqing Communications Research and Design Institute Co. Ltd., Chongqing 400067, China)
  • Received:2012-12-15 Online:2013-09-28 Published:2013-09-28

摘要:

结合四川省长河坝水电站地下厂房硐室工程,考虑地形、地貌与断层等地质构造,建立了三维有限元模型,基于实测地应力值,采用多元线性回归分析方法对地应力场进行反演,以分析地下厂房区的地应力分布情况.结果表明:地下厂房硐室岩体地应力的实测值与有限元法所得反演值吻合较好,回归分析方法适用于对地应力场的反演;工程区域的水平地应力大于竖向地应力,并且地应力量值随着垂直埋深与水平埋深的增加而增大;断层附近的地应力出现了局部应力集中现象,须引起注意.
 
 

关键词: 地下硐室, 地应力场, 有限元方法, 回归反演

Abstract:

Based on the measured initial stress, topography, geomorphology, and geological structure such as fault, a 3D FEM model was established for the multivariable regression back analysis of initial stress field in the underground powerhouse area of Changheba Hydropower Station. The results show that the FEM regression stress values are in good agreement with the measured values of the rock mass in the underground chamber area, and the regression method is effective for the back analysis; the horizontal stress is larger than the vertical stress, and the initial stress increases with the horizontal and vertical depth; and stress concentration appears near the fault, which should be paid attention for.

 

Key words: underground chamber, initial stress field, finite element method, regression back analysis

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