某软基砂井堆载预压失效原因分析

在某防洪工程的软基砂井堆载预压处理中，两预压段虽然采用相同的预压加固设计方案．但在预压加固后的检测中发现.其中一预压段预压效果良好，达到设计要求，另一预压段软土特性未能得以明显改善。通过比较分析后认为，砂井堆载预压效果影响因素有井径、井距、砂料、垫层及软土成分等因素，通过合理的设计和施工，能有效地对软基进行加固处理。

ANALYSIS ON PRELOADING FAILURE OF A SAND WELL ON THE SOFT FOUNDATION

In the process of a sand-well preloading on the soft foundation of a flood protective project, the designers adopted similar ways of preloading reinforcement in the two preloading periods, but only one of them met the requirements of the project design. This paper holds the belief that such factors as well diameter, well distance, sand material, cushion and the components of soft soil have their respective influences on the preloading results and that the problems can be solved if designed and constructed reasonably and appropriately.