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唐家山隧道位于构造地震断裂带,地质水文条件复杂,岩性及构造产状变化大,受“5.12”汶川地震的影响,含水破碎软岩变形比较突出,对施工中围岩变形控制要求较高。现场通过监控量测结合数值分析,探讨了隧道穿越软弱破碎岩层下围岩非线性变形特性,确定了隧道二次衬砌支护合理距离和时机,总结了唐家山软弱围岩变形特点。
The Tangjiashan tunnel is located in the tectonic earthquake fault zone, with complex geological and hydrological conditions and large changes in lithology and tectonics. Due to the influence of Wenchuan 5.12 Wenchuan earthquake, the deformation of water-bearing soft rock is more prominent. Higher. Through the monitoring and measuring combined with numerical analysis, the nonlinear deformation characteristics of surrounding rock under tunneling through soft broken rock are discussed. The reasonable distance and timing of secondary tunnel lining support are determined. The deformation characteristics of soft rock in Tangjiashan are summarized.