中文摘要：

排水量堆积的一种新类型， X 节 cast-in-place 水泥(XCC ) 堆积，最近在中国被开发了。广泛的领域测试和实验室实验被承担评估它的表演并且确定 X 塑造生气的节的不一致的变丑效果(裸体) 在安装期间。这份报纸开发试图捕获 NUDE 的一个简化理论模特儿。基于复杂可变飞机弹性的理论，为 X 塑造洞边界值问题的压力和排水量的靠近形式的解决方案被给。随后，分析答案被用来评估 NUDE，具体充满索引(CFI ) ，和周界减小 XCC 堆积十字的系数节。计算结果与领域测试结果相比，显示出合理同意。现在的简化理论模特儿揭示 X 塑造洞的变丑机制并且在 geotechnical 工程便于最新发达的 XCC 堆积技术的申请。

英文摘要：

A new type of displacement pile, the X-section cast-in-place concrete （XCC） pile, has recently been developed in China. Extensive field tests and laboratory experi- ments are undertaken to evaluate its performance and quantify the non-uniform deforma- tion effect （NUDE） of the X-shaped cross section during installation. This paper develops a simplified theoretical model that attempts to capture the NUDE. Based on the theory of complex variable plane elasticity, closed-form solutions of the stress and displacement for the X-shaped cavity boundary value problem are given. Subsequently, the analytical solution is used to evaluate the NUDE, the concrete filling index （CFI）, and the perimeter reduction coefficient of the XCC pile cross section. The computed results are compared with field test results, showing reasonable agreement. The present simplified theoretical model reveals the deformation mechanism of the X-shaped cavity and facilitates applica- tion of the newly developed XCC pile technique in geotechnical engineering.