【摘要】 偏压连拱隧道不同的施工过程对衬砌、岩体的受力特征和稳定性有着截然不同的影响,在地质条件较差的情况下该影响更为明显。结合安徽铜黄高速富溪隧道进口段工程项目,运用FLAC3D程序,对复杂地质条件偏压连拱隧道采用三导洞施工方法下的施工顺序进行了数值模拟研究,分析了进口段隧道衬砌、围岩和边坡在不同导洞、主洞施工顺序下的应力应变情况,通过对比,确定了先开挖左导洞的导洞开挖顺序和先开挖右主洞的主洞开挖顺序是较合理的。更多还原

【Abstract】 Different construction processes of a double-arch tunnel under an unsymmetrical pressure have completely different influences on the stress characteristics and stability of lining and rock mass,especially more obvious under poor geological conditions.By referring to the similar project of the Fuxi tunnel and using the software of FLAC3D,the authors simulate the excavating sequence of a double-arch tunnel during its construction under an unsymmetrical pressure and complex geological conditions by the 3-heading excavation method,and research the stress-strain state of lining and rock mass under different excavating sequences of the guide tunnel and main tunnel.A comprehensive analysis shows that a reasonable excavating sequence of a guide tunnel is to excavate the left guide tunnel firstly,and that of a main tunnel is to excavate the right main tunnel firstly.更多还原