考虑土体连续性的桩承载力自平衡法研究及工程试验

自平衡试桩法因其具有方便、经济等优势而被推广起来，但目前关于该方法转换成静载法荷载-位移曲线过程中涉及到的转换系数的研究较少.在对比研究自平衡试桩法与传统单桩竖向抗压静载试验方法的基础上，依据Mindlin解，对未考虑土体连续性时转换后得到的自平衡试桩桩顶位移与实际结果的差异进行分析，研究砂土地区试桩中的上托桩桩周土体位移对桩端沉降变化的影响，进而对现有确定自平衡试桩承载力的转换方法进行改进.通过室内模拟试验验证了该方法的可行性，将此方法应用到沈阳某高层桩基础工程试验中，发现采用考虑土体连续性的自平衡转换方法明显降低了荷载-位移曲线的拟合误差.

Research on the Self-balanced Method of Pile Bearing Capacity Considering Soil Continuity and Engineering Test

The self-balanced test pile method is gradually popularized due to its convenience and economy. However， few studies were focused on the conversion coefficient involved in the process of converting this method into the static load-displacement curve. Because the settlement on the pile top is affected by soil continuity， the displacement difference on the pile top of the self-balanced test pile and the static load pile were analyzed using the Mindlin′s formula based on the comparative study of the self-balanced test pile method and the traditional vertical compression static load test method of single pile. An equivalent conversion method to determine the bearing capacity of self-balanced test pile was proposed in order to improve the empirical formula. The rationality of the improved method was verified by indoor simulation test as well as pile foundation engineering test of a super high-rise building in Shenyang. It is found that the self-balance conversion method taking the soil continuity in to account can significantly reduced the fitting error of the load-displacement curve.