The Structure Of The Settlement Of Pile Foundation Stability Prediction Function Method And Its Application

In recent years,high-rise buildings spring up over towns.With prominent subsidence problems caused by these buildings,people pay more and more attention to subsidence observation and prediction.Researchers also attaches great importance to predict final settlement and to determine whether the subsidence is stable according to the last few times’ settlement.This kind of judgment method is more abstract,so this paper presents the view that construction function model can be used to predict settlement of pile foundation stability.This kind of new method is more accurate and faster to study rock-socketed pile’s settlement regularity of stable change under high-rise buildings loads,to find out from which one hundred year the pile begins to enter stable subsidence and its corresponding settlement amount,and to work out the final settlement amount.And this paper complements related information of subsidence experience coefficient in this area to provide theoretical reference basis for the coming subsequent engineering structure reliability design.There are some traditional computer programming methods to the study of predicting high-rise buildings’ subsidence,such as,the Asaoka’s method,classical gray model GM(1,1)and grey Verhulst model.These methods,with higher application value in engineering have received good feedback.However,these methods also have disadvantages.First of all,only considering settlement is the function of time,they ignore the main factor,load,which ultimately determines the settlement amount.Secondly,these above models’ theories are based on analyzing the equal intervals’ subsidence data,while the actually measured intervals are not equal.Thirdly,they can only be used to these continuous,and smooth developing events,not these mutational data sequence,so they often can not truly reflect the actual situation.Fourthly,they can not identify whether settlement enters a stable stage rapidly and accurately.These commonly used methods’ calculation results,of cause,have certain reference value,but their results often have a little deviation from the actual situation.So they can’t reflect effectively the high-rise buildings’ subsidence problems quickly and truly.To solve these deficiencies,this paper uses a new method to predict subsidence stability,structuring function model,which carries on numerical simulation of the sedimentation stability of rock-socketed pile by using the new structure function model according to the C++ programming software and forecasts and analyzes these data.Through the new structure function model,together with equivalent layered summation method,Boussinesq ’s solution,generation of entities based method,and Mindlin stress method,comparison is made between the actually measured values and the theoretical ones.The study shows that the results reached by numerical calculation between construction of functional model and C++ programming roughly match the theoretical ones.And they are better than Asaoka method,classical gray model GM(1,1)and grey Verhulst model.In the case quoted in the paper,rock-socketed pile settlement empirical coefficient in this area is from 0.5 to 0.8,which can guide the structure reliability design better;Correction coefficient caused by planar position is from 0.75 to 1.05.And when rock-socketed pile’s settlement stability time is 402 d,its corresponding settlement amount is 12.1 mm,and its final settlement one is 16.1 mm.The constructor calculation results are in good agreement wit the actual ones,which provide a new method to study the regularity stability of the rock-socketed pile settlement.