Abstract:

uring building works on soft ground, the work subsided identified observation is a prerequisite. The purpose of the observation at this stage aims to determine the subsidence of the works at the time of observation, check the calculation results predicted in the design stage, simultaneously can predict subsidence in future. According to the current Vietnamese Standard: 22TCN 262-2000, Roadbed Survey Standard embanked on soft ground; TCVN 9355:2012, Ground improvement by pretabricated vertical drain (PVD); Decision 384/QĐ-BGTVT, temporary regulations about construction techniques and acceptance items of processing soft ground, the application functions is Exponential, Hyperbolic function and Asaoka function. Currently, in many construction projects, Asaoka function is applied to subsidence forecast analysis by model of functions are very suitable with realistic subsidence. However, there is no variable of time in the function hence not to know the exact time of subsidence in the next period. In this paper, the authors will analyze each prediction function according to Vietnamese Standard and some other functions. From there, proposing and building model combines Asaoka function and other mathematical functions that promotes advantages in each function.