土工基础

›› 2013, Vol. 27 ›› Issue (5): 44-47.

• 工程实录 • 上一篇    下一篇

隧道光面爆破空气间隔装药不耦合系数研究

林 云1，程 康2   

  1. （1.四川能源投资集团有限责任公司，成都 610030;2.武汉理工大学土木工程与建筑学院， 武汉 430070）
  • 收稿日期:2013-03-06 出版日期:2013-10-22 发布日期:2013-10-28
  • 作者简介:林云(1963-)，男，高级工程师，研究方向为水电工程施工技术和施工管理工作。

Study on the Longitudinal Decoupling Coefficient of Airdecked Charge for Tunnel

LIN Yun1,CHENG Kang2   

  1. （1. Sichuan Energy Investment Group CO.,Ltd,Chengdu 6100302.School of Civil Engineering and Architecture, Wuhan University of Technology,Wuhan 430070）
  • Received:2013-03-06 Online:2013-10-22 Published:2013-10-28

摘要： 利用大别山隧道爆破空气间隔装药实验所得岩体的力学特性以及材料的CowperSymonds破坏准侧，采用LSDYNA数值模拟，建立双孔不耦合装药爆破模型，模拟不耦合装药爆破的应力发展过程，得出了应力时程曲线；分析了装药长度在1.4 m、1.5 m、1.6 m、1.7 m和1.8 m时，爆破孔壁压应力及孔壁破坏情况，得出了Ⅲ类围岩在孔深3.5 m的情况下最佳不耦合系数为1.94~2.18。

关键词: 隧道, 空气间隔装药, 光面爆破, 纵向不耦合系数, LS-DYNA

Abstract: During tunnel outline excavation,airdecked charge as a newtype technology is being used gradually.The decoupling coefficient will directly influence the result of smooth blasting.Using rock mechanical properties obtained from airdecked charge testing site of tunnel excavation in Dabie mountain,and CowperSymonds failure criterion,a double arch decoupling charge blasting model was established by using LSDYNA,to obtain decoupling charge blasting stress and simulate the process of blasting stress over time. The stress of hole wall and its damage situation was analyzed in the case of the chargelength at 1.4m,1.5m,1.6m,1.7m and 1.8m,from which an optimum longitudinal decoupling coefficient in the range of 1.94 and 2.18 was obtained for Rock Class III in the hole depth at 3.5m.This offered a theoretical foundation for the parameters for presplitting and smooth blasting.

Key words: Tunnel, Airdecked Charge, Smooth Blasting, Longitudinal Decoupling Coefficient；LSDYNA