基坑开挖对邻近既有隧道结构影响及注浆加固措施分析

以某邻近隧道的基坑开挖工程为研究对象,采用数值模拟手段分析基坑开挖对隧道结构的影响,并对注浆加固隧道的效果进行了研究.结果 表明:基坑开挖对邻近隧道弯矩影响明显,开挖后隧道结构内侧最大应力明显增大,最大应力均超过了混凝土的最大抗拉强度,存在开裂的风险;采用注浆加固后,最大正、负弯矩分别减小了28.7％和30.2％,隧道...

Influence of Foundation Pit Excavation on Adjacent Existing Tunnel Structure and Analysis on Grouting Reinforcement Measures

Relying on the foundation pit excavation engineering on adjacent existing tunnel as an research object, the influence of foundation pit excavation on tunnel structure is analyzed by numerical simulation, and the effect of grouting reinforcement of tunnel is studied. The results show that: the excavation of foundation pit has a significant impact on the bending moment of the adjacent tunnel, and the maximum stress inside the tunnel structure increases significantly after the excavation, and the maximum stress exceeds the maximum tensile strength of concrete, so there is a risk of cracking; After grouting reinforcement, the maximum positive and negative bending moments are reduced by 28.7 % and 30.2 % respectively, and the maximum tensile stress of the tunnel structure is reduced by nearly 32.0 %, which makes the inner stress of the tunnel less than the maximum tensile strength of the concrete, and ensures that the excavation of the side foundation pit will not lead to cracks in the tunnel.