Analysis And Control Measures Of Shallow Buried Tunnels Parallel Crossing Road Retaining Wall

With the advent of underground construction of urban rail transit,urban integrated pipe corridors,underground roads,etc.,coupled with the complex and diverse urban ground transportation system,various forms of retaining walls are used in roads,shallow buried tunnels When the road is laid,it is inevitable to cross the retaining wall in parallel.As we all know,the construction of shallow buried tunnels will affect the surrounding environment and buildings.Therefore,it is of great practical significance to study the influence and control measures of shallow buried tunnels passing through the retaining walls.Based on extensive research on relevant literatures at home and abroad,this thesis takes the common road gravity retaining wall and buttress retaining wall in Beijing as the research object,and combines theoretical analysis,numerical simulation and field measurement.The method of conducting a series of studies on the shallow buried tunnels through the retaining wall and achieving the following results:(1)When there is a retaining wall in the road,there is a height difference on the surface.When the tunnel is constructed below it,it is equivalent to construction in the bearing stratum.With the help of Matlab and FLAC3 D software,the differences between the construction of the tunnel in the free stratum and the formation deformation caused by the construction in the bearing stratum are compared and analyzed.Based on the stratum deformation caused by the construction of the tunnel in the bearing stratum,the displacement of the retaining wall under different spatial locations is analyzed form of deformation;(2)Using numerical analysis method,280 numerical models were established based on three factors: “retaining wall form”,“ratio of tunnel excavation size and retaining wall floor” and “relative spatial position”.The three factors were analyzed.The influence law of the displacement deformation of the retaining wall when the buried tunnel is traversed in parallel,and according to the degree of influence,it is divided into five sections from the spatial positional relationship from heavy to light,which provides a basis for the evaluation of tunnel line selection and crossing engineering;(3)With the aim of controlling the deformation of the stratum and the stability of the retaining wall,the corresponding control measures are proposed to ensure the stability of the retaining wall,and the effectiveness and rationality of the control measures are verified with the measured data.