Metro Jet System (MJS) joint microdisturbance reinforcement is often adopted to strengthen and remediate existing tunnels that are severely deformed by under-construction peripheral works, but analysis related to the reinforcement system of tunnel under consideration of seismic effects is insufficient at present. In this work, a field test of MJS joint microdisturbance reinforcement system of existing tunnels was conducted on the basis of a subway tunnel deformation reinforcement project. Then, a numerical simulation study of the seismic dynamic response of reinforcement system was performed in combination with seismic wave direction and intensity. Results show that the MJS joint microdisturbance reinforcement measures can effectively reduce the settlement and horizontal radial convergence deformation of the tunnel. The seismic longitudinal wave significantly affects the vertical displacement of the tunnel, and the seismic-induced vertical displacement of the tunnel increases with the rise in seismic intensity. The seismic transverse wave significantly affects the horizontal radial convergence deformation of the tunnel, and the seismic-induced horizontal radial convergence deformation of the tunnel increases with the rise in seismic intensity. The antiseismic property of MJS joint microdisturbance reinforcement measures on the existing tunnel is not obvious.

中文翻译：

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既有隧道MJS联合微扰加固现场试验及抗震性能研究

Metro Jet System（MJS）联合微扰加固常用于加固和修复因在建外围工程而变形严重的既有隧道，但目前考虑地震效应的隧道加固体系相关分析尚不充分。本文以某地铁隧道变形加固工程为基础，对既有隧道MJS联合微扰加固系统进行了现场试验。然后，结合地震波的方向和强度，对加固系统的地震动力响应进行了数值模拟研究。结果表明，MJS联合微扰加固措施能有效降低隧道的沉降和水平径向收敛变形。地震纵波对隧道竖向位移有显着影响，地震引起的隧道竖向位移随着地震烈度的增加而增大。地震横波对隧道水平径向会聚变形有显着影响，地震引起的隧道水平径向会聚变形随着地震烈度的升高而增大。MJS联合微扰加固措施对既有隧道的抗震性能不明显。隧道地震引起的水平径向辐合变形随着地震烈度的增加而增大。MJS联合微扰加固措施对既有隧道的抗震性能不明显。隧道地震引起的水平径向辐合变形随着地震烈度的增加而增大。MJS联合微扰加固措施对既有隧道的抗震性能不明显。