不同坡度下偏压黄土隧道开挖衬砌结构受力特征研究

Study on the Force Feature of Lining Structure for Large Bias Loess Tunnel Under Different Slope Gradient

偏压隧道的受力与常见的对称应力的受力情况有较大区别,随着西部地区基础设施建设的发展,在建设工程中经常遇到不同偏压地形下的黄土隧道,由于偏压隧道的特殊性,受力极不对称,对隧道的设计和施工产生较大影响。为了研究偏压黄土隧道开挖围岩及衬砌结构受力特征,利用FLAC^(3D)软件建立数值模型,计算不同坡度地形条件下隧道的围岩变形规律和衬砌结构的受力特征。

The stress situation of bias tunnel is quite different from the common stress situation symmetrical stress. More and more bias tunnels are encountered in the actual project with the development of construction,due to the special nature of the bias tunnel,so the force discontinuity symmetry. In order to study the forces of lining structure construction process for bias tunnel,a numerical model of loess tunnel is established by FLAC^（3D）software which come into different surrounding rock slope gradient,using up and down stairs construction method for the construction, the bias tunnel ＇s construction process simulation is done by different wall rock slope gradient.