超软淤泥地基浅层二次真空预压效果试验研究  

Experimental study on reinforcing effects of twice vacuum pre-loading of extreme-soft silt foundation

作　　者：姜建芳[1,2] 黄林根[1,2] 姜梅玲[1,2] 

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

出　　处：《人民长江》2015年第11期65-67,79,共4页Yangtze River

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：针对吹填淤泥地基承载力几乎为零的特点,采用二次(一次无砂垫层,二次有砂垫层)真空预压法对大面积吹填淤泥进行处理。通过现场试验,分别对两次真空预压中的真空度、地基沉降等进行了观测。结果表明,对超软淤泥地基采用无砂垫层进行一次预压处理,能有效解决因地基承载力过低而无法施工的问题;进而采用有砂垫层的二次预压提高了真空压力的传递效果,可以进一步提高地基承载力。Aiming at the extremely low bearing capacity of hydraulic fill foundation, the twice vacuum pre-loading reinforcing method, firstly preloading cushion layer without sand and then preloading cushion layer containing sand, was adopted to strength-en the silt foundation. By in-situ test, the vacuum degree and foundation settlement in the two preloading process were meas-ured. The results showed that the first preloading could effectively solve the problem of unable-to -construction caused by the extremely low foundation bearing capacity;the second preloading could improve transmission effect of vacuum pressure and fur-ther upgrade the foundation bearing capacity.

关 键 词：超软淤泥地基 真空预压 二次预压 现场试验 

分 类 号：P642[天文地球—工程地质学]