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[1]罗勇.基于D-P准则巷道围岩应变软化与破裂膨胀弹塑性分析[J].中国安全生产科学技术,2018,14(11):108-113.[doi:10.11731/j.issn.1673-193x.2018.11.017]
　LUO Yong.Elastoplastic analysis on strain softening and fracture expansion of roadway surrounding rock based on D-P criterion[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2018,14(11):108-113.[doi:10.11731/j.issn.1673-193x.2018.11.017]
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基于D-P准则巷道围岩应变软化与破裂膨胀弹塑性分析
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
14
期数:
2018年11期
页码:
108-113
栏目:
职业安全卫生管理与技术
出版日期:
2018-11-30

文章信息/Info

Title:
Elastoplastic analysis on strain softening and fracture expansion of roadway surrounding rock based on D-P criterion
文章编号:
1673-193X(2018)-11-0108-06
作者:
罗勇
(中南大学 资源与安全工程学院，湖南 长沙 410083)
Author(s):
LUO Yong
(School of Resources and Safety Engineering, Central South University, Changsha Hunan 410083, China)
关键词:
D-P准则; 圆形巷道; 应变软化; 破裂膨胀; 弹塑性分析
Keywords:
DruckerPrager (D-P) criterion;  circular roadway;  strain softening;  fracture expansion;  elastoplastic analysis
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2018.11.017
文献标志码:
A
摘要:
为了得到考虑围岩应变软化、破裂膨胀和中间主应力情况下的巷道围岩弹塑性解，基于非关联流动法则和Drucker-Prager准则，引入中间主应力系数，建立软化和膨胀模型，得到了巷道变形、破裂区和塑性区半径的解析式，并进行了应用分析。研究结果表明：随中间主应力增大，巷道变形、破裂区和塑性区半径先减后增；围岩软化越严重，对巷道变形、破裂区和塑性区半径影响越显著；软化阶段的膨胀行为对塑性区半径不产生影响，但影响巷道破裂区半径和变形；残余阶段的膨胀行为对破裂区和塑性区半径不产生影响，但影响巷道的变形；巷道变形、破裂区和塑性区半径随支护阻力增大而减小，且原岩应力越大，支护对变形影响越显著。
Abstract:
To obtain the elastoplastic solution of roadway surrounding rock considering the strain softening, fracture expansion and intermediate principal stress of surrounding rock, the softening and expansion model was established by introducing into the intermediate principal stress coefficient based on the nonassociated flow rule and DruckerPrager (D-P) criterion. The analytical expressions of roadway deformation, radius of fracture zone and radius of plastic zone were derived, and the calculation case and application analysis were carried out. The results showed that the roadway deformation, radius of fracture zone and radius of plastic zone decreased first and then increased with the increase of intermediate principal stress. The higher the softening degree of surrounding rock, the more significant the influence on the roadway deformation, radius of fracture zone and radius of plastic zone. The expansion behavior in the softening stage would not affect the radius of plastic zone, but affect the roadway deformation and the radius of fracture zone. The expansion behavior in the residual stage would not affect the radius of fracture zone and radius of plastic zone, but affect the roadway deformation. The roadway deformation, radius of fracture zone and radius of plastic zone decreased with the increase of support resistance, and the greater the in situ rock stress, the more significant the influence of support on the deformation.

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备注/Memo

备注/Memo:
收稿日期： 2018-10-16；数字出版日期：2018-11-23
基金项目： 中南大学中央高校基本科研业务费专项资金项目(2017zzts167)
作者简介： 罗勇，博士研究生，主要研究方向为巷道围岩控制和支护。
更新日期/Last Update: 2018-12-03