Research On Local Load Bearing Capacity Of The Manual Hole Digging Pile Under Multiple Loads

Based on the example of a high rise residential building in Kunming,which uses the foundation underpinning and Synchronous jack-up two technologies.A key problem in the construction project,that is,the calculation method of the bearing capacity of the manual hole digging pile under the multiple loads.It was not solved in the past design code yet and The research on the problem is not reported to date.This paper will discuss and analyze the problem.In this paper,the main achievements were summarized in detail as follows:In this paper,concrete plasticity damage models and ABAQUS are selected to analysis 12 local compression text.From the results,it can be seen that the concrete plasticity damage models in this paper has the advantages of clear mechanics concept and easy using.The parameters Y in the model have great influence on the simulation results,when(?)=40°,the numerical simulation results are close to the experimental results.Based on the apposite physical parameters,this paper analysis the variety of stress and strain,the variety of tension damage,and the N-S curve.It is the original work that the local compression mechanism of the manual hole digging pile under the multiple loads was discovered deeply and this paper puts forward the failure mode-truss model for the first time.Based on the above research and analysis,this paper presets two reinforcement measures-steel pipe and connecting block.From the results,it can be seen that local pressure carrying capacity,ductility and residual strength are strengthened of the manual hole digging pile.Influences of the number of loads,pile spacing,the volumetric ratio of net reinforcement,the load spacing and the pile diameter of the manual hole digging pile were investigated systemically.On the basis,the reduction factor was used to consider the effect of multiple loads in this paper.Finally,a calculation table of the bearing capacity of the manual hole digging pile under the multiple loads was established.The results indicate that the method has clear mechanics concept,and easy using,which can supply practical engineering and specifications with reliable references.