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以宝天高速公路天水过境段梁家山泥岩隧道为工程背景,通过现场测试,研究了围岩拱顶下沉、围岩与初期支护接触压力、钢拱架应力和初衬与二衬接触压力随时间变化规律及分布特征,并应用现有的理论和方法对实际工程安全状态进行评估。研究结果表明:以隧道开挖空间效应和Chern经验公式两种理论方法对拱顶沉降数据进行分析处理,所得到的隧道极限位移相差较小;围岩与初期支护压力的分布具有不均匀性特点;钢拱架外缘应力平均值大于内缘,拱顶处应力大于其他部位,按其推算得到的拱顶沉降极限位移更接近于实际情况;初衬与二衬间接触压力先迅速增加后逐渐较小最后趋于稳定,其稳定值整体偏小。
Taking the Liangjiashan mudstone tunnel in the Tianshui transit section of Baotian Expressway as the engineering background, field tests were conducted to study the relationship between the surrounding rock cavern and the initial support contact pressure, the stress of the steel arch and the contact pressure between the first lining and the second lining With time variation and distribution characteristics, and apply existing theories and methods to evaluate the actual project safety status. The results show that the settlement of the dome is analyzed by the two theoretical methods of tunnel excavation space effect and Chern empirical formula, and the difference of the ultimate displacement of the tunnel is small. The distribution of the surrounding rock and the initial support pressure is inhomogeneous The stress of the outer edge of the steel arch frame is greater than the inner edge, and the stress at the vault is greater than that of other parts. The ultimate displacement of the vault settlement is closer to the actual situation. The contact pressure between the first lining and the second lining rapidly increases Gradually smaller and eventually stabilized, the overall stability of the small value.