Analysis of the Effect of Parallel Rectangular Pipe Jacking Construction on Surface Settlement
In the design and construction of parallel rectangular pipe jacking,the surface settlement caused by construction is a very important consideration.In order to investigate the influence of the mutual position between parallel rectangular jacking pipes on the surface settlement,a comparative study on the construction process of parallel rectangular jacking pipes under different construction parameters is carried out through numerical simulation to obtain the change rule of the construction-induced surface settlement curve.The study shows that when the ratio of two rectangular jacking pipe spacing to pipe diameter is small,the influence of the first pipe on the later pipe is obvious,and the surface settlement in the middle of the two parallel jacking pipes is larger,and with the increase of the ratio,the surface settlement in the middle position decreases from 36.6 mm to 24.9 mm,and the surface settlement curve is transformed from the"U"shape to the"W"shape;when the ratio of burial depth to pipe diameter is small,the surface settlement value is the largest,but the mutual influence between the top pipes is not obvious,and the surface settlement curve shows"W"shaped in general.As the burial depth increases,the surface settlement value decreases from 41.1 mm to 36.6 mm,at which point the settlement curve transitions into a"U"shape.The influence between the pipe jacking sections is concentrated in the central area,where the surface settlement varies little with changes in various parameters.