（上海市浦东新区公共交通投资发展有限公司， 上海 200125）

［摘要］由于受最大有效加固深度的限制，强夯置换在软弱土层深厚的大型油罐地基中的应用受到了制约。结合云南某炼油项目地基处理工程，通过多种检测手段对强夯置换试验区地基加固效果进行了分析和评价，确定了强夯置换墩长度、墩底软弱土层和墩间土加固效果，并根据试验区检测结果，确定10万m3油罐地基分层强夯置换的设计施工参数。分层强夯置换方案中，底层采用柱锤强夯置换，以形成较长的置换墩来穿透软弱土层；顶层回填土层采用平锤强夯置换，使松散回填土得到立体全方位的挤密加固。大面积施工检测结果和油罐充水预压监测结果表明，油罐地基承载力和变形均能满足相关规范的要求，分层强夯置换在该项目中具有较好的地基加固效果，可在类似工程中推广应用。

［关键词］大型油罐； 强夯置换； 置换墩； 软弱土层

中图分类号：TU472-1文献标识码：A文章编号：1002-848X(2017)06-0096-06

Application of layered dynamic compaction replacement in foundation treatment of large oil tank project

Chen Guodong

(Shanghai Pudong Public Transport Investment & Development Co., Ltd., Shanghai 200125, China)

Abstract:The application of dynamic compaction replacement in foundation treatment of large oil tank project is limited when soft soil layer is thick or deeply buried because of the limitation of the maximum effective reinforcement depth. Based on the foundation treatment in a refinery project in Yunnan Province, effects of foundation reinforcement for foundation in test region of dynamic compaction replacement were analyzed and evaluated through a variety of detection methods. The dynamic compaction replacement pier length, soft soil layer at bottom of pier and reinforcement effect of soil between piers were determined. According to detection results in test region, design and construction parameters of layered dynamic compaction replacement of 100 000 m3 tank foundation were determined. Pillar-hammer dynamic compaction replacement was adopted in layered dynamic compaction replacement to form a long replacement pier to penetrate soft soil layer. Meanwhile flat-hammer dynamic compaction replacement was adopted in top-layer backfill soil to compact and reinforce loose backfill three-dimensionally and omnidirectionally. The large area construction detection results and water filling preloading monitoring results of oil tank show that the bearing capacity and deformation of oil tank foundation can satisfy the requirements of relevant specifications and layered dynamic compaction replacement in this project has a good effect of foundation reinforcement, so the method of layered dynamic compaction replacement can be widely applied in similar projects.

Keywords:large oil tank; dynamic compaction replacement; replacement pier; soft soil layer

*上海市科技启明星资助项目（No.08QB14026），上海现代建筑设计集团基金资助项目（No.15-1类-0016-基）。

作者简介：陈国栋，硕士，高级工程师，注册土木工程师（岩土），Email:guodong19@126.com。