分离式隧道非同步开挖岩爆预测研究

Study of rockburst prediction of separated tunnel excavated asynchronoushy

分离式隧道是深埋长大高速公路隧道施工的主要方式,鉴于两洞的施工进度不同,利用先开挖洞的岩爆发生情况,对后开挖洞的岩爆发生情况进行了预测,并采用有限元数值模拟进行计算分析。结果表明,当初始应力场中的水平应力和竖向应力相当时,随着研究区侧压力系数的增大和净距的减小,后开挖洞拱底发生岩爆的强度会随之增大。当初始应力场中的水平应力占主导地位时,随着研究区侧压力系数的增大和净距的减小,后开挖洞拱顶发生岩爆的强度会随之减少。通过实际工程对计算分析结果进行了验证,结果表明,隧道实际发生岩爆的情况和计算结果较为吻合。

Separated tunnel is a primary job practice in deep and overlength highway tunnel.Taking into account the diversity of construction progress of two tunnels,it is put forward that the study of rockburst prediction of the tunnel excavated slower through the rockburst condition of the tunnel excavated quicker.In order to investigate the rockburst influence of the tunnel excavated quicker to the tunnel excavated slower,a series of calculations and analyses are carried out by using the FEM;and some results are ob...