自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第47卷    第8期    总第264期    2016年8月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2016)08-2842-06
应变软化圆形隧道围岩的逐步量纲一化应力分析方法
蒋武军1,邹金锋2

(1. 湖南省高速公路管理局,湖南 长沙,410001;
2. 中南大学 土木工程学院,湖南 长沙,410075
)

摘 要: 基于线性Mohr-Coulomb强度准则,采用量纲一化分析方法,改进应变软化围岩应力位移求解的逐步应力分析法。通过将软化围岩塑性区分为有限个圆环,对每个圆环求解其应力和应变增量,得到软化围岩应力和位移解。利用现有的理论解验证该方法的正确性和可靠性。通过数值计算和参数分析,揭示部分参数对围岩应力和位移的影响规律。研究结果表明:当圆环数量n=500时,逐步量纲一化应力解与精确解吻合度较高;塑性区随临界塑性应变偏差 增大而减小,当 增加到某一定值时,围岩内部不存在残余区;塑性半径及围岩位移随着 的减小而不断增大,当 为0时,软化围岩近似于脆性状态。

 

关键词: 应变软化;逐步应力法;Mohr-Coulomb强度准则;圆形隧道

Dimensionless analysis of stress numerical stepwise procedure in strain-softening rock mass
JIANG Wujun1, ZOU Jinfeng2

1. Hunan Provincial Expressway Administration Bureau of Hunan Province, Changsha 410001, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:Based on generalized Mohr-Coulomb failure criterion, an improved numerical method and stepwise procedure for the stress and displacement analysis of a circular opening excavated in a strain-softening rock mass were proposed by using the dimensionless analysis method. By deviding the plastic region of strain-softening rocks into finite annuli and calculating the stress and strain increments, the stress and displacement in the plastic region were obtained. The stress and displacement increments of the annulus were obtained through the stress equilibrium and compatibility equation of the annulus, and the stress and displacement of strain-softening region were obtained. The validity and reliability of the proposed solution were confirmed by the existing theoretical solution. The influence of partial parameters on the stress and displacement was revealed by numerical calculation and parameter analysis. The results show that the dimensionless solution is in agreement with the exact solution when the number of the annulus is enough. The plastic region decreases with the increase of the critical plastic strain deviation, and the plastic residual area vanishes when the critical plastic strain deviation increases to a certain definite value. The plastic radius and displacement increase with the decrease of the critical plastic strain deviation. The softened region turns into brittle when the softening control parameter is equal to zero.

 

Key words: strain-softening; numerical stepwise stress procedure; Mohr-Coulomb failure criterion; circular tunnel

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号