引汉济渭工程黄三段输水隧洞围岩变形与压力分析

发布时间：2018-08-15 15:54

【摘要】：以分析深埋长隧洞围岩应力和应变为目标,考虑隧洞施工方式,围岩支护形式等因素,通过数值计算,动态模拟隧洞施工过程,获取了黄三段输水隧洞初期支护后的围岩变形情况以及围岩与衬砌相互作用关系。计算结果显示:采用设计的初期支护形式,可有效控制不良洞段的围岩变形,Ⅳ、Ⅴ类围岩最大收敛变形满足规范设计要求。Ⅳ、Ⅴ类围岩与衬砌间的相互作用力随衬砌浇筑时距掌子面距离的增加而降低,但在距掌子面约4倍洞径后降幅微小。通过对比分析经验方法与数值方法所确定围岩压力成果,确定了衬砌结构设计所需的围岩压力指标,为黄三段输水隧洞设计提供了依据,分析方法可为相似工程提供参考。
[Abstract]:In order to analyze the stress and strain of surrounding rock in deep buried long tunnel, considering the factors such as tunnel construction mode, surrounding rock supporting form and so on, the construction process of tunnel is simulated dynamically by numerical calculation. The deformation of surrounding rock and the interaction between surrounding rock and lining are obtained. The results show that the initial support can effectively control the deformation of the surrounding rock in the bad tunnel section, and the maximum convergent deformation of the surrounding rock of class 鈪，

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