Ground movement analysis of soft surrounding rock during highway tunnel construction in mountainous areas

Based on the soft surrounding rock practical engineering situation of Hanjiazhuang tunnel of Baofu highway in Taihang mountainous areas, the stochastic medium theory is applied to analyze the ground movement induced by tunnelling excavation in mountainous areas. In the project, the passing through zone of the tunnel has soft surrounding rock, big transformation and big-span tunnel. Because of big transformation and high construction difficulty in tunnelling engineering of soft surrounding rock, more deep study is needed for characteristics of big-span roadway. For the natural slope safety and normal usage of the tunnel, it is extremely important to estimate the ground movement induced by tunnelling construction. The ground movement is viewed as a stochastic process and the stochastic medium theory is applied to predict and analyze the ground movement in cross section due to tunnelling construction. By comparing the theoretical results with the practical engineering examples, the construction technological scheme applied to the safety in the tunnelling engineering is proposed.