The Indoor Model Experimental And Numerical Simulation Analysis Of Excavation And Supporting On Foundation

With the rapid development of city construction, large number of high-rise buildingconstruction and municipal underground space development, in order to meet the needs ofbuilding structure and the use of functional requirements, excavation depth is more and moredeeper, and the growing area.Soil nailing is a kind of economic and reliable, fast construction foundation bracing infoundation engineering technology, a large number of applications received. But the soilnailing support cannot be used for silt soil and other bad soil, underground water level and onthe deformation control strictly in foundation engineering. In recent years, soil nailing isdeveloped on the basis of soil nailing and cement soil mixing pile, prestressed anchor bolt,advanced micro pile supporting forms combining composite soil nailing support. Compositesoil nailing technology can be targeted at different sites and geological condition, suit one’smeasures to local conditions, flexible combination. But the composite soil nailing workingmechanism research is not deep enough, resulting in engineering is often appear in order toensure the safety and stability of the foundation, foundation support design personnel tocontinuously improve the safety coefficient, causing material waste; on the other hand,because the instability of foundation and the deformation caused by the engineering accidentbut when have happened.Combined with the actual project, using similarity theory to the indoor model test designstudy. And the prestressed anchor composite soil nailing by MIDAS / GTS finite analysissoftware for numerical simulation and engineering monitoring and contrast. The prestressedanchor composite soil nailing were studied thoroughly, the conclusion to the similarengineering design has a certain reference value: (1) Different modes of arrangement, in the supporting system of soil nailing and anchorthe axial force transmission and distribution;(2) Each construction stage, foundation horizontal displacement curve will appear" drumbelly" phenomenon, the maximum horizontal displacement of foundation is occurred, not thetop;(3) Prestressed anchor section of the axial force and the free section are connected tolocal maximum, minimum variation in the distal, axial force distribution curve, and with theincrease of depth of excavation.