振杆密实法处理筛余回填土地基现场试验研究  

Field study on the treatment of sieve residual backfills using vibratory probe compaction method

作　　者：杜广印[1] 徐金涛 刘松玉[1] 王宇虓 杨泳 刘学军 Du Guangyin;Xu Jintao;Liu Songyu;Wang Yuxiao;Yang Yong;Liu Xuejun(School of Transportation,Southeast University,Nanjing 211189,China;Jiangsu Shengtai Construction Engineering Co.,Ltd,Lianyungang 222000,China;Xinjiang Academy of Architectural Sciences Co.,Ltd,Urumqi 830000,China)

机构地区：[1]东南大学交通学院,南京211189 [2]江苏盛泰建设工程有限公司,连云港222000 [3]新疆建筑科学研究院(有限责任公司),乌鲁木齐830000

出　　处：《东南大学学报（自然科学版）》2024年第6期1504-1510,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(42277153,41977241);天山英才培养计划资助项目(2023TSYCLJ0055)。

摘　　要：为探究振杆密实法应用于筛余回填土地基的可行性,依托乌鲁木齐市白鸟湖医院建设项目,采用自主研发的振杆密实法设备开展了筛余回填土地基现场试验研究,使用压实度检测、重型动力触探和平板载荷试验及瑞利面波测试等原位测试方法对加固效果进行了评价.结果表明:处理后筛余回填土的压实度提高了12.13%~48.08%;处理范围内土层的动力触探击数随深度增加而增大,较处理前平均提高2倍以上;处理后地基承载力特征值f_(ak)为277 kPa,满足设计要求,土层平均波速由136 m/s提升至175 m/s,提高约29%.振杆密实法可以显著提升筛余回填土地基的承载力和均匀性,为筛余回填土地基的加固处理提供了一种新思路.To explore the viability of the vibratory probe compaction(VPC)method applied to sieve residual backfills,utilizing the Bai Niao Lake Hospital project in Urumqi,field experiments were conducted with VPC equipment developed independently.The reinforcement effectiveness was evaluated using in-situ testing methods such as compaction detection,dynamic penetration test,plate load test and surface wave test.The results show that the degree of compaction of the sieve residual backfills increases by 12.13%-48.08%after treatment.The number of blows in dynamic penetration tests within the treated layer rises with the increase of depth,averaging over double the level before treatment.After the treatment,the characteristic bearing capacity value f_(ak)reaches 277 kPa,satisfying the design requirements.The average Rayleigh wave velocity of soil layer increases by almost 29%,from 136 to 175 m/s.The VPC method can significantly improve the bearing capacity and homogeneity of sieve residual backfills,providing a new idea for the treatment of sieve residual backfills.

关 键 词：采砂坑 筛余回填土 振杆密实法 深层振动密实 地基处理 

分 类 号：TU472[建筑科学—结构工程]