Movement Of Tunnel And Soil Between Two Adjacent Excavations

With the explorations of underground space and the development ofexcavation technology, excavation with complex form is more and morecommon. Closely constructed excavations will cause complex deformationbehavior of the soil, especially with existing tunnel. The excavation may evenbe a threat to the safe operation of the tunnel. Use nonlinear plane finiteelement method to research the deformation characteristics of soil and tunnelbetween two excavations and the influence of construction methods. Theconclusions provide reference and basis for future similar projects. The maincontent and research are as follows:(1) Research the influence of distance between excavations, the widthand depth of excavations to the deformation of soil between excavations. Therelationship of optimal distance between excavations and the width ofexcavations is derived. The influence of the distance between the tunnel andthe excavation to the deformation of tunnel and diaphragm wall is analyzed.(2) The influence of separated excavation, tie-pile were analyzed. Theresults show that the deformation caused by excavation increased much morewhile the partition wall is close to the central tunnel. The tied pile candecrease the lifting value of the tunnel at some extents. Discuss thedeformations in different construction sequences. It is concluded that theheave of tunnel will be reduced in symmetric excavation sequence.(3) Apply the research conclusion to a foundation pit project. Analyze the monitoring data and summarize the law of tunnel deformation, lateraldisplacement of wall, settlement of ground and so on.