上海交通大学学报（英文版） ›› 2012, Vol. 17 ›› Issue (5): 552-558.doi: 10.1007/s12204-012-1324-7

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Study on Toughening on Crack Prevention of Jointed Rock Masses with Different Pre-Stress Anchor Cables

WANG Zhong-chang1,2* (王忠昶), ZHAO De-shen2 (赵德深), WU Hui-jun1 (吴会军)   

  1. (1. School of Civil and Safety Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China; 2. College of Civil and Architectural Engineering, Dalian University, Dalian 116622, Liaoning, China)
  • 出版日期:2012-10-30 发布日期:2012-11-16
  • 通讯作者: WANG Zhong-chang1,2* (王忠昶) E-mail: wazoch@163.com

Study on Toughening on Crack Prevention of Jointed Rock Masses with Different Pre-Stress Anchor Cables

WANG Zhong-chang1,2* (王忠昶), ZHAO De-shen2 (赵德深), WU Hui-jun1 (吴会军)   

  1. (1. School of Civil and Safety Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China; 2. College of Civil and Architectural Engineering, Dalian University, Dalian 116622, Liaoning, China)
  • Online:2012-10-30 Published:2012-11-16
  • Contact: WANG Zhong-chang1,2* (王忠昶) E-mail: wazoch@163.com

摘要： The major reason of the failure of jointed rock-mass is the formation of the plastic zone near the crack tip of I-II mixed crack which leads to the growth, propagation of the branched crack under load condition. In the paper, the failure judgment of mini-plastic zone’s displacement is derived by the Mises yielding rule. The anchor cable is simulated by the different link elements and inflicting pre-strains according to the difference of mechanism of the consolidated segment and free segment. The stress and strain fields near crack tip of twain collinear cracks of different angles and consolidated conditions are simulated by iso-parametric element with eight nodes. The iso-parametric element with eight nodes is degenerated to singular element at crick tip to simulate crack. It is shown that the mini plastic zone’s displacement near the crack tip begins to increase, then decreases with the increase of the angle of the crack. The better consolidated condition is, the smaller the angle of crack tip is when the mini plastic zone’s displacement near the crack tip arrives at the biggest value. The mini plastic zone’s displacement near the crack Tip 2 is bigger than that near the crack Tip 3. The crack is easier to failure with the increase of load.

关键词: Mises yielding rule, I-II mixed crack, stress strength gene, rock bridge, plastic zone, pre-stressed anchor cable

Abstract: The major reason of the failure of jointed rock-mass is the formation of the plastic zone near the crack tip of I-II mixed crack which leads to the growth, propagation of the branched crack under load condition. In the paper, the failure judgment of mini-plastic zone’s displacement is derived by the Mises yielding rule. The anchor cable is simulated by the different link elements and inflicting pre-strains according to the difference of mechanism of the consolidated segment and free segment. The stress and strain fields near crack tip of twain collinear cracks of different angles and consolidated conditions are simulated by iso-parametric element with eight nodes. The iso-parametric element with eight nodes is degenerated to singular element at crick tip to simulate crack. It is shown that the mini plastic zone’s displacement near the crack tip begins to increase, then decreases with the increase of the angle of the crack. The better consolidated condition is, the smaller the angle of crack tip is when the mini plastic zone’s displacement near the crack tip arrives at the biggest value. The mini plastic zone’s displacement near the crack Tip 2 is bigger than that near the crack Tip 3. The crack is easier to failure with the increase of load.

Key words: Mises yielding rule, I-II mixed crack, stress strength gene, rock bridge, plastic zone, pre-stressed anchor cable

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