Optimal Design Of Pile And Anchor Supporting Structure

With the rapid development of urban construction in China and the continuous emergence of high-rise and super high-rise buildings,the building area available for urban use is becoming less and less,the complexity of the surrounding environment is increasing,and the scale of urban underground space development is becoming larger and larger.At the same time,it has greatly promoted the rapid development of the theory and technical level of foundation pit engineering.At present,many deep foundation pit retaining designs are relatively conservative,resulting in some unnecessary waste.Therefore,under the condition that the overall stability and deformation of the foundation pit meet the requirements of the corresponding codes,it is particularly important to optimize the supporting design of the foundation pit and make it economical and reasonable.Taking a deep foundation pit project in Xi ’an as the research background,this paper carried out optimization research on the supporting design scheme of deep foundation pit project with the help of MIDAS/GTS finite element software platform,in order to achieve the purpose of safe and reliable,technically feasible and economically reasonable of deep foundation pit project.The following work was mainly carried out.Firstly,on the basis of summarizing the research status of deep foundation pit engineering at home and abroad,the types,characteristics,influencing factors,design concepts and calculation theories and technical methods of deep foundation pit supporting design are analyzed and discussed.Secondly,according to the engineering geology,hydrogeology and site environment conditions of a deep foundation pit in Xi ’an,the pile and anchor supporting structure is designed.Thirdly,using MIDAS/GTS finite element software for modeling,and in the selection of different design parameters,the numerical simulation is carried out.Through the comparative analysis of the maximum horizontal displacement of piles,in the premise of meeting the deformation requirements,a group of new pit pile anchor structure design scheme is selected.Finally,the maximum horizontal displacement and surface settlement of the optimized design scheme are compared with that of the original design scheme.It is proved that the optimized foundation pit supporting design scheme is safe and feasible,saves the project investment,and is an effective new design method.The research results of this paper have been applied to engineering practice,saving investment for engineering,and the design method can be used as a reference for similar engineering design in the future.