Abstract: In order to investigate the distribution regularity of the earth pressure in pile-anchor supporting system of foundation pit engineering, the field measured data of an express way project in Zhengzhou was employed to calculate respectively the active, passive, static earth pressure and the results determined by earth pressure model under fournonlimit states compare them to their actually measured data, and the applicability of various models was discussed. The result showed that when thequasi-active displacement was small, the results of Zai Jinmin model, Xu Riqing model and Chen Yekai model would be approximately equal to the static earth pressure while the result of Lu Guosheng model would be small and the actually measured value would be between the static earth pressure and the active earth pressure. When the quasi-passive displacement was small, the results of Xu Riqing model and Chen Yekai model would be almost equal to the static earth pressure. The result of Zai Jinmin model would be approximately 1.3 times of the static earth pressure. The result of Lu Guosheng model would be relatively larger. For a practical project with sound geological condition and 3 mm less horizontal displacement of supporting pile in pile-anchor supporting system, the static earth pressure could be taken as the earth pressure in design and construction of the pile-anchor supporting system.

Key words: foundation pit engineering, earth pressure, field monitoring, pile-anchor support