The Research On Regional Land Subsidence On The Impact Of The Bridge Pile Foundation

In recent years, high-speed railway in China has been rapid development, however, some high-speed railway passed through the area where land subsidence was severe.so it was particularly necessary to research on the effect of the land subsidence for working pile foundation characteristics and its relationship with the pile settlement.This article first to understand the factors that influenced regional land subsidence, predicted the regional settlement by artificial neural network technology and three-dimensional groundwater simulation software Visual Modflow, at the same time, making use of the plaxis software,obtained the work of the bridge foundation characteristics under the influence of the pumping groundwater level changes, and analysised of the factors which affected the characteristics of the bridge pile foundation, then continuly analysised of the relationship between the land subsidence and the pile settlement by data. Finally,proposed the corresponding control engineering measures of bridge pile foundation.Through this research, mainly achieved the following results:(1) the regional land subsidence was caused mainly due to excessive pumping of underground water; (2) the land subsidence of 10 years was predicted by artificial neural network technology which was based on existing experimental data; (3) made using of Visual Modflow software, based on the measured and predicted subsidence values, stady the water level changes which was caused by pumping groundwater,and calculated the precipitation caused by land subsidence by the empirical formula; (4) made using of Plaxisâ…¡dimensional finite element analysis software, analysised of the pile of the operating characteristics under the influence of the different pumping drawdown, it was showed that with the drawdown increasing, pile foundation decreasing; (5) In the case of regional land subsidence, the bearing layer of soil modulus and internal friction angle of the impact of change on the ground subsidence around pile was more obvious, while the pile length increased, the ground settlement around the pile was not affected,however, it was workful to pile settlement, and pile diameter effected on the pile settlement less; (6) proposed the relationship formula of the pile settlement with the changes of land subsidence; (7) proposed a number of regulatory measures of bridge pile foundation settlement.