Effect of ground fissures on lining structure of tunnels and engineering measures

Under the influences of tectonic movement and groundwater change, the fissures in Xi'an area are widely distributed at the concave junction of loess beam.The monitoring results of ground fissure movement show that the ground fissure movement has experienced the stage of development, violent activity, slow deformation and stability.On the basis of determining the relative settlement displacement of the upper and lower discs of the fissure movement, the structural measures of the tunnel with ground fissures adopting the expansion section and setting the deformation joints are put forward.With the development of the relative settlement deformation of the upper and lower plates of ground fissures, the lining structure of joints produces vertical staggered displacement and rotational motion characteristics.In order to adapt to the displacement of ground fissures and to meet the requirements of subway operation space, the concentrated distribution area of tensile stress and the movement of lining structure of joints are produced in the inner arch waist of tunnel.The engineering measures of asphalt concrete sealing deformation joints to prevent groundwater leakage are put forward.