| As there are more and more high-rise buildings in the big cities, new foundation pits are usually nearby old high-rise construction. In this case, the wall of the pit is actually a"soil column"with a rectanglular section,we have to considered not only the stability of the"soil column", but also the settlement of the old high building, so it is really very difficut to make a perfect design for the retaining structure of the new pit according to existing theory and methodology on soil pressure and the displacement of the retaining structure. This paper aim at the problem that there is a high-rise building who has a CFG composite foundation next to the foundation pit, though cantilever retaining pile model test, simulate the excavate process, made a testing system to measure datum in order to research on the characteristics of the soil pressure, the moment on the retaining pile, the displacement of the pile wall, and the settlement of the CFG composite foundation. This paper mainly achievements are as follows:⑴During the excavate process of the foundation pit, the displacement of the pile wall is mainly upright.⑵When the depth of the foundation pit is less than the CFG composite foundation of it's neighbor building, the pile wall is safer than have no neighbor building.⑶When the foundation pit is deeper than the CFG composite foundation of it s neighbor building, the pile wall is more dangerous than have no neighbor building.⑷During the excavate process of the foundation pit,the neighbor's composite foundation could"adjust"the moment on the pile wall, from the top down, make it smaller and distribute more well-proportioned.⑸The"adjust"is a stress transfering process, the stress is transferred to the end of the pile wall.As the pit is deeper than it's neighbour's composite foundation, the stress is large enough to make the pile wall pierce into the soil under it.⑹The"soil column"is very important to keep the pit's neighbour building fixing.
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