基于CPTU土分类的振杆密实法适用范围与评估方法研究  

Study on assessment method and application scope of vibratory probe compaction method using CPTU-based soil classification method

作　　者：高常辉 杜广印[1,2] 刘松玉[1,2] 章定文[1,2] 杨泳 曾彪 谢羚 Gao Changhui;Du Guangyin;Liu Songyu;Zhang Dingwen;Yang Yong;Zeng Biao;Xie Ling(School of Transportation,Southeast University,Nanjing 211189,China;Jiangsu Key laboratory of Urban Underground Engineering and Environmental Safety,Southeast Iniverity,Nanjing 211189,China;Jiangsu Shengtai Constniction Engineering Co.,Ltd.,Lianyungang 222000,China;Suzhou Highway Administration,Suzhou 215000,China)

机构地区：[1]东南大学交通学院,江苏南京211189 [2]东南大学江苏省城市地下工程与环境安全重点实验室,江苏南京211189 [3]江苏盛泰建设工程有限公司,江苏连云港222000 [4]苏州市公路管理处,江苏苏州215000

出　　处：《土木工程学报》2022年第2期82-91,119,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(41977241);江苏省自然科学基金(7621000141);东南大学优博培育基金(YBPY1981)。

摘　　要：传统基于Fellenius-Eslami研究的适合振动密实的土类评估方法仅认为砂和砂砾土是可密实的,然而在国内过去十余年的工程实践表明该评估方法过于保守。该文通过介绍十字形振杆密实法处理可液化粉土地基、复杂的滨海相可液化地基等施工案例,论证了振动密实技术处理粉土地基的良好效果。在此基础上,提出了基于孔压静力触探测试(CPTU)的中国国标土分类的振动密实土类评估方法,认为归一化CPTU数据处于"中砂"、"细砂"、"粉砂"和"粉土"区域内的地基土是可以采用振杆密实法进行加固处理的。该判别方法适合当前国内振杆密实法的应用实践,同时又进一步扩大了振杆密实法在地基加固处理方面的优势。In the traditional assessment method for soil classification of vibration compaction based on Fellenius-Eslami researches, only sand and gravel soil are considered to be compactable.However, the engineering practices of China in the past decade have revealed that the method is over-conservative.In this work, the two construction cases for the treatment of liquefiable silt ground and complex coastal liquefiable ground using cross-shaped vibratory wing are introduced, so that the good performance of vibration compaction technology in treating silt ground can be validated.Furthermore, an assessment method for vibrating compacted soil based on the Chinese standard for soil classification using the piezocone penetration test(CPTU) is proposed.It is believed that the ground soil with normalized CPTU data classified into “medium sand”, “fine sand”, “silt sand” and “silt” can be improved by vibratory probe compaction method.Hence, the new assessment method is suitable for the practical applications of the vibratory probe compaction method to China, and at the same time the advantages of the method in ground improvement ared highlighted.

关 键 词：振动密实 振杆密实法 孔压静力触探 十字形振动翼 粉土地基 滨海相可液化地基 湿陷性黄土 

分 类 号：TU472.1[建筑科学—结构工程]