围海造地软基加固试验研究  

Consolidation of Soft Foundation of Reclamation Projects

作　　者：朱群峰[1] 赵士文 杨守华[1] 胡为贤 张凌[1] 高长胜[1] 

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024 [2]南京瑞迪建设科技有限公司水科院勘测设计院,江苏南京210029

出　　处：《郑州大学学报（工学版）》2012年第5期16-21,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：江苏省自然科学基金资助项目(BK2009052);中央级公益性科研院所基本科研业务费专项资金重点资助项目(Y300901)

摘　　要：围海造地形成的吹填淤泥地基具有含水率高、压缩性高、强度极低等特点,对工程使用极其不利,必须进行加固处理.结合某工程,采用真空预压法对吹填淤泥地基进行加固,同时布置原观仪器进行现场试验研究.位移监测结果表明试验区实测地表沉降量达1 616mm,地基加固结束时的平均固结度达86%,工后沉降小于300mm;水平位移小于10mm;吹填淤泥单位厚度的压缩量达267mm/m,属于大变形的范畴;真空度和孔隙水压力监测结果表明真空度在吹填淤泥地基中的传递存在较大的沿程损失;地基加固效果检测结果表明加固后的吹填淤泥平均十字板强度达15.2kPa;吹填淤泥的土性指标得到了不同程度的改善;地基承载力大于60kPa;地基加固达到了预期的效果.探讨了真空预压加固吹填淤泥地基存在的问题,建议进一步开发土工水箱来改进吹填淤泥地基加固方法.The dredger fill of reclamation projects is characterized by high water content, high compression and low strength, etc. , and it must be reinforced because of its adverse effects on projects. Based on a practi- cal project, the dredger fill is consolidated by means of the vacuum preloading method. Field tests are per- formed by arranging in-situ instruments. According to the results of displacement monitoring, the ground sur- face settlement is 1616 mm, the average degree of consolidation may reach 86% at the end of foundation rein- forcement, and the post-construction settlement is less than 300 ram. The horizontal displacement is less than 10 mm. The compressive deformation of dredger fill per unit thickness is 267 ram/m, and it belongs to large deformation. According to the results of degree of vacuum and power water pressure monitoring, the degree of vacuum which transmits in the dredger fill foundation has larger frictional loss. The average vane strength of the dredger fill after construction is 15.2 kPa. The indices of the dredger fill are improved to some extent. The bearing capacity of the foundation is more than 60 kPa, and the foundation consolidation is satisfactory. The existing problems in consolidating the dredger fill by use of the vacuum preloading method are discussed. It is suggested that the consolidation method for the dredger fill should be improved by developing the geotechnical water box.

关 键 词：吹填淤泥 真空度 工后沉降 承载力 土工水箱 

分 类 号：TU472.6[建筑科学—结构工程]