大断面隧道塌方机理与安全性控制研究

隧道工程在现代城市建设中起到了至关重要的作用。大断面隧道因其具备较高的通行能力以及良好的通风条件,被广泛应用于城市地下交通、水利工程等领域。然而,随着隧道工程规模的不断扩大,大断面隧道的安全问题也逐渐引起了人们的关注。隧道塌方作为大断面隧道工程中的一种常见事故类型,一旦发生,往往会导致严重的人员伤亡和财产损失。因此,深入研究大断面隧道塌方的机理以及相应的安全性控制措施显得尤为重要。

富水软弱围岩隧道塌方机理及治理技术研究

隧道施工穿越富水软弱围岩时常发生塌方地质灾害,给工程建设带来困难。该文依托江西省昌宁高速公路莲花山隧道塌方实例,运用多物理场耦合模拟软件对典型断面进行流固耦合数值计算,定量分析了富水软弱围岩隧道塌方过程中围岩和支护结构的应力、位移以及渗流场响应特征,研究了塌方发生机理。基于稳固处治原则,采取了包含塌体稳固、塌方影响段加固、塌方情况物理探测、管棚支护参数设计、塌方段洞内管棚注浆支护、短开挖强支护的综合治理技术措施。围岩变形监测结果表明:塌方处治效果较好。

Collapse mechanism of deep tunnels with three-centered arch cross section

The possible collapse of different circumstances is derived with the help of the limit analysis theory.Analytical equations related to collapsing mechanisms in deep tunnel with smooth three-centered arc cross sections are derived on the basis of Hoek-Brown failure criterion and upper bound limit analysis.The pore water pressure is considered in the analysis,as a work rate of external force.Numerical results about the shape of detaching curve and the weight of collapsing block per unit length corresponding to different parameters are obtained with the help of mathematical software.The shapes of collapsing block are drawn with respected to different parameters.Furthermore,the effects of different parameters on the shape of detaching curve and the weight of the collapsing block are discussed.