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以长沙市营盘路湘江隧道东岸并行立交段施工为研究对象,对浅埋条件下并行立交隧道施工安全性进行三维数值模拟分析。研究结果表明:隧道施工结束后地表沉降最大值为39.66 mm,并位于隧道上下立交区域,地表沉降不能满足安全要求,还需对地表采取加固措施,如采取地表锚杆、地表袖阀管注浆或旋喷桩加固;下部隧道初期支护变形及受力受上部隧道施工影响不大,安全系数均大于1,结构能满足安全要求,但施工中仍不能忽视对初期支护变形及内力的监测,视情况采取加固措施,或改变施工工艺,如可以先行贯通下部隧道二次衬砌。其研究结果可为类似地质条件和施工方法的同类工程提供借鉴。
Taking the construction of parallel crossings on the eastern bank of Xiangjiang River tunnel in Yingpan Road, Changsha City as the research object, the three-dimensional numerical simulation of the construction safety of parallel interchange tunnels in shallow buried conditions was carried out. The results show that the maximum surface settlement is 39.66 mm after the completion of tunnel construction and is located in the up and down interchange area of the tunnel. The settlement of the ground surface can not meet the safety requirements. Reinforcement measures should be taken on the ground surface such as grouting Or jet grouting pile. The deformation and stress of the initial support of the lower tunnel are not affected by the construction of the upper tunnel, the safety factor is greater than 1, the structure can meet the safety requirements, but the monitoring of initial support deformation and internal force can not be ignored , Depending on the circumstances to take reinforcement measures, or change the construction process, such as can be carried out through the lower tunnel secondary lining. The results of this study can provide reference for similar projects of similar geological conditions and construction methods.