Abstract: The construction of crossing gallery under the urban roads may cause uneven settlement or even excessive settlement, which will affect the normal traffic and even cause traffic accidents. In order to study the influence of shallow buried pipe gallery project on pavement settlement, based on the integrated pipe gallery project of the third section of the rapid transformation project of Susong Road in Hefei City, the parameters of pipe shed and small conduit in advanced support were analyzed by field measurement and numerical simulation. The results show that the diameter of pipe shed has little effect on the control of ground surface settlement. There is an optimal circumferential spacing of 0.4 m for pipe shed. As the distance between pipe shed and lining increases, the supporting effect of pipe shed decreases. The pipe shed support can be used alone, and small conduit can only be used as an auxiliary advanced support method. The comprehensive supporting effect of pipe shed and small conduit is likely to be superposition of their respective supporting effects. Considering other unstable factors in actual construction, the best supporting scheme is as follows: for pipe shed, the diameter is 69-89 mm, the circumferential spacing is 0.4 m, and the distance from the lining is 0.3 m; for small conduit, the external intercalation angle is $ 45^{\circ}-60^{\circ} $, the circumferential spacing is 0.3-0.4 m, and the length is 2.5-3.5 m.
Keywords: integrated pipe gallery; pipe shed; small conduit; step method; ground surface settlement
合肥工业大学学报自科版