山区城市环境下节理围岩小净距隧道施工力学研究

Research on Mechanics in Construction of Small Clearance Tunnels of Joint Wall Rocks in Mountainous City Environment

以重庆东水门长江大桥和千厮门嘉陵江大桥渝中区连接隧道为依托工程,在室内岩石力学试验的基础上,结合工程地质分析和公路隧道设计规范,选取比较符合工程实际的节理围岩参数,且基于二维离散元软件UDEC建立节理围岩小净距隧道数值模型,并对其施工力学效应进行研究,详细分析隧道围岩的位移及应力变化特征、隧道开挖对上覆建(构)筑物的影响等。此外,还对隧道施工支护方法进行优化分析。

With Yuzhong connecting tunnel between Chongqing Dongshuimen Yangtze River Bridge and Qiansimen Jiangling River Bridge as a supported project, on the basis of indoor rock mechanical test and in combination with geological analysis of the project and the code for design of highway tunnels, this paper establishes numerical model of small clear distance tunnels of joint wall rocks by selecting joint wall rock parameters compliant with the practicality of the project and based on 2D discrete element software UDEC, studies its mechanical effect in construction, and analyzes displacement and stress change features of tunnel wall rocks and influences of tunnel excavation on overlying buildings （ structures ） , etc. In addition, the paper also performs optimized analysis for support methods in tunnel construction.