数值模拟了上拔荷载、桩上拔位移与时步的关系，并与宏观物理实物试验的实测结果作了对比分析；
The relations between uplifting load , displacement and time were simulated numerically and compared with the results of actual pile tests, and the ultimate uplifting bearing capacity was defined.
研究了极限上拔承载力和抗拔桩的破坏机理。
The ultimate uplift bearing capacity, failure mechanism of piles were studied.
结果表明，DX桩的抗拔承载力明显大于同等条件下的等截面桩，且DX桩的荷载-上拔位移关系呈缓变形；
The results show that the tension bearing capacity of DX pile is apparently higher than that of the pile with constant section, and the curve of load-displacement of DX pile is slowly varying.
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