The Rule Of Surface Settlement At Double Tunnel In Clay

With the development of our country’s economy, in order to meet the demand oftraffic, subway tunnel are constructed in many cities, and those tunnels are double holes.Tunnel construction will inevitably cause the subsidence of the ground. When thesurface settlement is larger, it is bound to affect the ground transportation and thenormal use of underground pipeline. Now, there are many researches about singletunnel construction, but there are little researches on the double parallel tunnelconstruction, because of its complexity. Besides, most of the researches tend to studythe double hole ground lateral settlement caused by tunnel construction, the researchesabout longitudinal surface settlement are few. Therefore, it is necessary to study thehorizontal and vertical settlement in the process of double parallel tunnel construction.In consider of the development of modern large computer, it is available for usingelement software to simulate the surface settlement caused by tunnel construction.By consulting a lot of materials in domestic and overseas, FLAC3D is adoptedto simulate the laws of surface settlement and considering the condition of elastic andelastic-plastic, under the condition of elastic, Schwarz alternating method is deduced thelaw of surface settlement. The main contents include:1. Through studying different embedded depth to the effect the double tunnellongitudinal settlement, Summing up the impact of buried deep to the effect of thesurface longitudinal settlement.2.Simulating with FLAC3D,considering spacing, the ration of depth,diameter andthe loss rate of strata to the effect of the surface lateral settlement.3. By changing the buried depth of the tunnel，the double tunnels at not the sameplane.To studying the effect of different buried depth for the surface settlement4. In semi-infinite plane, trough Using the complex variable function and Schwarzalternating method, the surface settlement caused by tunnel construction are got.