浅埋偏压连拱隧道施工对既有隧道力学特性的影响研究

Study on Influence of Construction of Shallow Buried Biased Arch Tunnel on Mechanical Characteristics of Existing Tunnels

新建隧道与既有隧道间距较小时,新建隧道施工易对既有隧道产生扰动,为保证既有隧道安全,需对其进行加固。为验证以工字钢为骨架,结合喷射混凝土作为支护结构,并以导管注浆加强的加固方案有效性,采用数值模型的方法,分别建立加固前后的数值计算模型,分析加固前后既有隧道支护结构的受力变形规律。

When the distance between the newly built tunnel and the existing tunnel is small,the construction of the new tunnel is likely to cause disturbance to the existing tunnel.To ensure the safety of existing tunnels,it is necessary to reinforce existing tunnels.In order to verify the effectiveness of the reinforcement scheme with I-beam as the skeleton,combined with shotcrete as the supporting structure and enhanced by conduit grouting,The numerical model is used to establish the numerical calculation model before and after reinforcement,and the force deformation law of the existing tunnel support structure before and after reinforcement is analyzed.