软基处理中土体抗剪强度与压缩模量的研究

The Increment of Shear Strength and Compression Modulus during Soft Ground Improvement

以福州江阴港铁路大型货场的软基处理项目为背景,对四种常用的软基处理工法(包括排水板堆载预压、砂桩堆载预压、真空联合排水板堆载预压、搅拌桩联合排水板堆载预压)进行了工程适用性研究。通过对现场监测、原位测试与室内试验数据的分析,在现有规范公式的基础上引入了两个新参数,提出了东南滨海相欠固结软土的抗剪强度与压缩模量随上覆荷载增长的经验公式。这种反映软土主要力学指标随上覆荷载发展的规律,可以为东南沿海地区类似条件下的软基处理工程提供借鉴与参考。

Based on the ground improvement project of Jiangyin Rail Spur Line in Fuzhou City,the applicability of four ground improvement methods commonly used in practice（ including heap preloading by plastic drainage pile and heap preloading by sand pile,vacuum combined heap preloading by plastic drainage pile,heap preloading by plastic drainage pile and cement-mixed pile） are studied. Based on the data from in-site tests,in-site monitoring and laboratory tests,introducing two new parameters into the standard formulas,two empirical formulas for the increase of shear strength and the increase of compression modulus are proposed. These two empirical formulas,which reflect the increasing of soft ground mechanical indexes with the preloading,can provide some reference for the similar project in the coast area of southeast China.