摘要
通过建立静力模型模拟既有隧道衬砌的现有受力状态并分析新隧道开挖时引起既有隧道的衬砌应力重分布;然后建立动力模型分析新隧道爆破时应力波在既有隧道二次衬砌中引起的应力状态;将静力模型和动力模型中隧道衬砌的应力进行矢量叠加,评判新隧道爆破开挖对既有隧道的影响。结果表明新建隧道爆破开挖对既有隧道的应力分布有较大影响,使得既有隧道二次衬砌近新隧道侧边墙处拉应力达到1.57MPa,超出混凝土抗拉强度,建议对新隧道施工采取必要的控制措施,从而保证既有隧道的安全。
Through establishment the static model to simulate and analyze the stress of existing tunnel lining and the stress redistribution of existing tunnel lining that caused new tunnel excavation; Then create dynamic model to analysis the stress state of existing tunnel lining when the new tunnel blasting stress wave induced in the existing tunnel lining; The static model and dynamic model of the stress vector superposition of tunnel lining to judge the influences of new tunnel blasting to near tunnels. The results showed a greater impact of the new tunnel blasting stress distribution of existing tunnel,it makes the existing tunnel side wall tensile stress of secondary lining that near the new tunnel reaches 1. 57 MPa,which beyond the tensile strength of concrete. Recommends that the necessary measures to control the construction of the new tunnel,so as to ensure the safety of existing tunnel.
出处
《青海交通科技》
2016年第4期101-106,共6页
Qinghai Transportation Science and Technology
关键词
隧道
爆破
震动
应力
Tunnel
Blasting
Shock
Stress
