Abstract：Research purposes: With the numerical computation，considering the bearing capacity of the soil core within the closed underground diaphragm wall，the characters of the load － settlement，inside and outside frictional resistances，end － bearing resistance，resistance on the top soil core and its load － sharing ratio of the closed diaphragm wall were analyzed in detail，and the load transfer characteristics of the closed diaphragm wall were discussed．
Research conclusions: The closed underground diaphragm wall was in form of the whole settlement，and the up and middle parts of soil core presented the basic synchro settlement with the wall． The bottom part of soil core behaved the compressive deformation feature． The vertical load － bearing of the base relied on its settlement with the bearing characteristic of end skin friction bearing wall． As the inside and outside skin frictions of the wall presented the dissimilar operation mechanism，the most deformation of the the soil outside of the wall were the shearing deformation featured with effects of the outside skin friction from top to bottom． However，the inside skin friction，due to suffering upward compressive deformation， took place gradually from the bottom to the top when the bottom part of soil core was subjected to the reaction． The effect of the outside skin friction preexisted the end － resistance，sequentially the inside skin friction． The inside resistance along the depth presented exponential function expression．
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2011, Vol. 28 
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