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Abstract Based on the deep foundation pit of Jiyuqiao Station of Wuhan Metro Line 2，a three-dimensional elastoplastic numerical simulation model is established. In this model，the groundwater seepage and soil consolidation effect are both considered. The ground settlement and lateral displacement of diaphragm wall are calculated；and the basic deformation characteristics of the foundation pit are studied. Then，the calculated results are compared with field data to verify the rationality and accuracy of the numerical model. Finally，the main factors and arrangement pattern of passive zone improvement，which both have influences on the magnitude and distribution of the foundation pit deformation，are analyzed. The results show that the displacement control effects of passive zone improvement are significant. Preferably，the width and depth of skirt border improvement should not be too large. When the width(or depth) exceeds a certain value，the increasing rate of improving effect will be very little. The optimum improving effect can be obtained when the width and depth of skirt border improvement are approximately equal. On the assumption that the parameters of skirt border improvement are unchanged，the improving effect is mainly determined by the replacement ratio of the strip improvement；and it is basically irrelevant to the arrangement pattern of passive zone improvement.
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Received: 26 September 2009
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