地铁联络线洞室群施工安全性分析

Safety Analysis on Construction of Cave Group in Metro Connecting Lines

为了分析地铁联络线洞室群施工的安全性,依托徐州地铁2号线中心医院站淮塔东路站区间段施工工程,采用有限元的分析方法,建立了横通道竖井开挖段的数值计算模型,设置了5种不同的区间隧道开挖进洞的施工工况,分析了横通道两端5个洞室采用不同的开挖进洞顺序施工时对横通道和周边环境的影响,提出合理安全的区间隧道的施工进洞顺序,同时也对横通道两侧的开挖段进行了分析,得出D型断面开挖进洞施工对整个横通道竖井开挖段的影响最大,并指出了各区间隧道开挖进洞时横通道段的不利位置,最后将相应监测点处的模型计算结果与现场监测资料对比分析,验证了模型的正确性。

In order to analyze the safety of the construction of the tunnel group of the subway connection line,relying on the construction project of the section from the Central Hospital Station to the Huai Ta East Road Station of Line 2 of Xuzhou Metro,the numerical calculation model of the excavation section of the transverse channel was established by using the finite element method,five different working conditions of tunnel construction were set,and analyzed the influence on the cross-channel and surrounding environment when the five tunnels at both ends of the cross-channel were constructed with different excavation sequences. The construction sequence of reasonable and safe interval tunnels was proposed. Meanwhile,the excavation sections on both sides of the transverse channel were also analyzed. It is concluded that the D-section excavation has the greatest influence on the entire transverse passage shaft excavation section,and points out that the transverse passage section when the tunnel is excavated in each section. Finally,the model calculation results at the corresponding monitoring points are compared with the onsite monitoring data to verify the correctness of the model.