无砂垫层真空预压突出问题及沉降卸载标准探讨  

Discussion on prominent problems and settlement unloading standard of vacuum preloading without sand mat layer

作　　者：吴雄伟[1,2] 金华辉[1,2] 

机构地区：[1]浙江广川工程咨询有限公司,浙江杭州310020 [2]浙江省水利河口研究院,浙江杭州310020

出　　处：《中国港湾建设》2014年第11期8-11,共4页China Harbour Engineering

基　　金：浙江省自然科学基金项目(LY13E090002);浙江省科技厅创新团队建设与人才培养(2011F2042);水利部公益性行业科研专项(201201043)

摘　　要：基于温州某大面积真空预压处理工程实践,对无砂垫层真空预压新技术在实践中较为突出和争议的问题进行了探讨,表明在避免"土柱"效应前提下,适当增加开泵率和布泵数,对预压效果提高较为有利;严格控制吹填淤泥(预压前)质量,对场地沉降和标高控制较为重要;由于加固效果在水平和纵向分布上的不均匀性,大面积真空预压加固地基不均匀性不可避免;选择代表性场地进行试验,对确定沉降卸载标准和提高预压效果较为重要。Taking a large-area vacuum preloading project in Wenzhou as an example, we discussed the prominent and controversial issues about the new technology of vacuum preloading without sand mat layer in actual project. The results show that proper increase the open pump rate and pump distribution number in the premise of avoiding ’earth-pillar’ effect will improve the preloading effect remarkably;strictly control of hydraulic fill mud＆#39;s quality before preloading plays an important role in the control of site settlement and elevation control;due to the nonuniformity of reinforcement effect in horizontal and vertical direction, the nonuniformity of large-area vacuum preloading subgrade is unavoidable, the selection of representative field for testing is quite important for confirming the settlement unloading standard and improving the preloading effect.

关 键 词：真空预压 无砂垫层 沉降 稳定标准 

分 类 号：U655.544.4[交通运输工程—港口、海岸及近海工程] TU43[交通运输工程—船舶与海洋工程]