Numerical Simulation And Optimization Research Of The Inside-supporting Of One Deep Foundation In Kunming

With the rapid development of city scale and the land resources is increasingly nervous, the expansion of underground space is imperative. The research of foundation pit engineering has become a focus in geotechnical engineering field. This paper takes Kunming Dianchi Lake resort housing foundation pit engineering and Kunming Iron Home deep foundation pit engineering as the research background, using MIDAS/GTS to simulate the whole process of foundation pit supporting and making the contrastive analysis between results of numerical simulation and field measurement. The deformation, supporting force on the excavation process, the dependence of the related rule are discussed in this paper, the main work and research results are as follows:(1) This paper proposes a new method in the geotechnical engineering numerical simulation of soil layer calculation method for elastic modulus value, which analogy of specification layered summation method to calculate foundation settlement, considering the time effect of sedimentation and bits of ψs experience introduction of subsidence coefficient, and it also based on the compression modulus Es to rationalize calculated from the calculation of elastic modulus Ej. Adopts this method, the typical foundation pit supporting section of the results of numerical simulation of the ensured projects consistent with the field measurement, which shows that the calculating elastic modulus method is of high value rationality for calculation of soil modulus for MIDAS/GTS software, and it also provides a quantitative method of reasonable access, avoiding the subjectivity and with larger degree of access methods in the past..(2) Using MIDAS/GTS software to make numerical simulation analysis of the excavation of deep foundation pit engineering, through construction stage analysis, the process of measured data are in good agreement with numerical simulation results, which shows that in MIDAS/GTS software numerical simulation analysis process, according to the calculation of the proposed method to determine the soil elastic modulus, it can give tallies with the actual results; the numerical simulation results can be as a reference for subsequent excavation, and provides a certain guiding role for the project construction.(3) In the design of foundation pit supporting, to facilitate in the design of the retaining piles used in the present stage design software (such as Richard is deep foundation pit supporting software) or simplify part design work (such as environmental impact analysis), on the basis of overall analysis in the space, it need to simplify the support each section to plane problem to analyzed and designed. During the process of simplifying, it must be determine the elastic support stiffness with reasonable, this paper according to space overall analysis results to determine the elastic support stiffness. The corresponding overall peace surface analysis results verify the rationality of the method. To this project, comparison results show that the theoretical analysis and field testing of MIDAS/GTS can give a better prediction results, the software results are generally safe.(4) The numerical analysis results show that no matter from the perspective of safety and economy, there are several aspects can be optimized of the, this article has carried on the related research, presents three local optimization scheme and related discussion, the conclusion and points of view can be a reference for the similar engineering practice.