中文摘要：

通过数值模拟试验，计算分析了先加桩后填筑坝体（先桩后土）、先填筑坝体后加桩（先土后桩）和先填筑坝体后加桩并注浆（先土后注浆）3种情况下的地基固结变形、应力特性。以秦岭电厂灰坝加固工程为例，探讨了复合地基施工顺序优化的方法机理和影响因素，结果表明：“先土后桩”的施工顺序较传统的“先桩后土”可以较大地发挥上部土体对地基的压密作用，使桩间土承担更大的上覆荷栽，促进地基土的固结，大大减少地基的“工后沉降”，有利于坝体或路基的安全运行。

英文摘要：

Through numerical simulation, we analyzed the consolidation deformation and stress characteristics of foundation under three conditions, including dam filling after piling （first pile, then earth filling）, piling after dam filling （earth filling first, then pile） and piling and grouting after dam filling （earth filling first, then grouting）. Taking dam consolidation project of Qinling Power Plant for example, we studied the mechanism of construction procedure optimization and its influential factors. The results show that piling after dam filling can play greater compact role of upper soil to foundation consolidation more than that of the traditional dam filling after piling make earth between piles bear larger load, promote foundation consolidation, and largely reduce settlement after construction, which is beneficial for safe operation of dam and roadbed.