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一、前言膨胀土地区的桩基在桩周土反复胀缩变形作用下,受力状态十分复杂,在桩基设计中还存在不少难以解决的问题。近年来,国内外科学工作者为了探索合理的桩基计算公式提出了许多理论。但迄今尚无确切的定论。我国自1974年开展膨胀土专题研究工作以来,对作为膨胀土地基处理的主要措施——桩基进行了研究。该研究成果大部分已纳入国家“膨胀土地区建筑技术规范”(送审
I. INTRODUCTION Under the effect of repeated expansion, contraction and deformation of pile soil in piles in the expansive soil area, the stress state is very complicated. There are still many problems that are difficult to solve in the pile foundation design. In recent years, scientists at home and abroad have put forward many theories for exploring reasonable pile foundation calculation formulas. But so far there is no definitive conclusion. Since 1974, when China launched a special study on expansive soil, it has studied the pile foundation, which is the main measure for treating expansive ground. Most of the research results have been incorporated into the national “expansive soil area building technical specifications” (for review