钙质砂土中的桩基础工程综述

桩基础广泛应用于钙质砂土这类高压缩性地基中。在总结钙质砂土的成因、分布特点、基本物理性质和力学 特性的基础上，认为在钙质砂土地基中传统打入桩提供的承载力不能满足工程要求，并针对传统打入桩失败原因进行了分 析。详细介绍了两种新型桩结构形式、施工方法、承载力特性及存在的问题，对两种新型桩进行了比较。总结了两种新型桩 的优缺点，提出对新型桩形式的可能的改进方案。在总结已有研究的基础上，建议引入数值模拟方法配合试验研究的新思路。

Pile foundation engineering in calcareous soils

Pile foundations are widely used in compressible soils such as calcareous sediments. Based on an introduction of the origin, distribution, basic physical properties and mechanical properties of calcareous soils, it is concluded that traditional driven piles are ineffective in calcareous soils and the reasons for it are analyzed. A review of the published literature pertaining to pile foundations in calcareous soils is summarized, and two new types of piles are described, along with their structural types, construction methods, bearing capacity characters, existing problems and comparison between them. Each method has its own advantages and disadvantages. Some improved schemes are proposed and new research approaches combing experiments with numerical simulation are suggested.