盾构下穿钱塘江大堤动态分析及控制技术研究

RESEARCH ON DYNAMIC PARAMETER CONTROL TECHNOLOGY OF QIANTANG RIVER EMBANKMENT UNDER SHIELD

盾构隧道越江施工下穿大堤,往往引起大堤过大变形进而影响其服役安全,探索泥水隧道下穿大堤变形控制技术与最优施工技术参数对越江工程具有指导意义。文中结合杭州地铁8号线盾构下穿钱塘江实际工程,采用软件PLAXIS 3D对盾构下穿钱塘江大堤进行了有限元数值分析。运用小应变土体硬化模型(HSS)分析了不同注浆压力、掌子面支护压力和盾构掘进速度对大堤沉降影响规律,并对不同位置隧道施工的最优注浆压力进行模拟分析,从而确定出最优盾构施工技术参数。文中研究可为隧道下穿大堤沉降变形提供技术支撑,为类似过江隧道工程施工提供参考。

Cross-river construction of a shield tunnel underneath the levee often causes excessive deformation of the levee and affects its service safety.Exploring the deformation control technology and optimal construction technical parameters of the mud water tunnel underneath the levee has guiding significance for cross-river projects.In this paper,the software PLAXIS 3D was used to conduct a finite element numerical analysis of the shield tunneling under the Qiantang River embankment combined with the actual project of Hangzhou Metro Line 8 shield tunneling under the Qiantang River.The small strain soil hardening model(HSS)was used to analyze the influence of different grouting pressures,tunnel face supporting pressures and shield tunneling speeds on the settlement of the levee.The optimal grouting pressure for tunnel construction at different locations was simulated and analyzed.So as to determine the optimal shield construction technical parameters.This study can provide technical support for the settlement and deformation of the tunnel underneath the embankment,and provide a reference for the construction of similar tunnels across the river.