Quzhou Yinglun Residence Deep ExcavationCompound Soil Nailing Structure By Simulation And Comparative Analysis Of GTS

With social progress and economic development, the process of urbanization is more and more quickly, now we on the underground space development and utilization of the demand is also growing, more and more of the deep foundation pit and ultra deep foundation pit in the geotechnical engineering field was born. Deep foundation pit engineering not only in the design to ensure feasible, in construction process to ensure the stability and safety of foundation pit, construction technology should be simple, maximum cost savings. The pit will be discussed in this paper are the most common in the foundation pit supporting form a composite structure of soil nailing wall. Application of composite soil nailing wall can be widely used in combination for different strata of flexible. However, the application of composite soil nailing technology often appears the following two phenomena: design personnel on the one hand, in order to ensure the safety and stability of the foundation pit, greatly improve safety coefficient, lead to the waste of material and manpower; on the other hand to save costs, the designers will appear too take into the design lead to deformation of the foundation and instability, caused the accident, resulting in the loss. Based on the composite soil nail wall supporting the research status, this paper combines the Handan City Wanxiang real estate development company for the development of Quzhou Yinglun Residence Area Deep Foundation Pit Engineering, the application of MIDAS / GTS analysis software of the most common soil nailing wall and prestressed anchor cable and waterproof curtain of composite soil nailing support to analyze ways and thus obtained some useful conclusions. The main conclusions are as follows:(1) By using MIDAS/GTS finite element software, the maximum horizontal displacement of the composite soil nailing structure was obtained in the middle and lower part, showing the ‘drum belly’.(2) The largest part of the axial force of the prestressed cable is in the intersection of the free section and the anchoring section, the minimum axial force occurs at the end of the anchorage segment, and the axial force distribution is not uniform, and the axial force is equal to the tension locking value. The axial force of soil nails are a ‘semi jujube-stone-like’ distribution.(3) With the increase of the load near the foundation pit, the ground settlement value will increase accordingly, the foundation pit supporting design should pay attention to the surrounding overload and the scope of the overload.