摘要
针对沿海吹填超软土地基,提出了"先浅后深"的两次真空预压施工方法,即无砂垫层改性真空预压处理浅层吹填土和二次真空预压处理深层软土。一次真空预压使表层土承载力满足施工机械进场条件后,再敷设砂垫层并布置深层塑料排水管,开展二次真空预压以处理深层软土。通过现场试验,测得了浅层和深层两个加固阶段的超净孔隙水压力、地表沉降和加固前后地基的剪切强度,发现两次真空预压法在沿海超软土地基加固中具有显著效果和良好的工程适用性。
This paper proposes twice vacuum preloading methods in shallow and deep soil layers,the fist vacuum preloading treatment in shallow filled ground without sand cushion and the secondary vacuum preloading treatment in deep soft soil.When the shallow ground can bear the construction load(such as machines)after the first vacuum preloading treatment,sand cushions and plastic drain boards are constructed for the secondary vacuum preloading to reinforce the deep soft soil.The variations of pore water pressure and ground settlement during twice vacuum preloading,and the ground shear strength before and after the treatments are tested,finding that this method has significant effects and good engineering applicability in filled coastal ground.
作者
李维安
王伟刚
LI Weian;WANG Weigang(Ningbo Municipal Engineering Construction Group Co.,Ltd.,Ningbo,Zhejiang 315046,China)
出处
《施工技术》
CAS
2019年第1期43-45,49,共4页
Construction Technology
关键词
地基
超软土
真空预压
施工技术
试验
foundations
super soft soil
vacuum preloading
construction
tests