真空预压加固吹填淤泥土现场试验研究.pdfVIP

2010 年4 月 水运工程 Apr. 2010 第4 期 总第440 期 Port Waterway Engineering No. 4 Serial No. 440 ·地 基· 真空预压加固吹填淤泥土现场试验研究* 唐彤芝，黄家青，关云飞，陈海波，程万钊 （南京水利科学研究院，江苏南京210029） 摘 要：分析了某滨海地区新近吹填淤泥土的物理力学性质、颗粒组成和强度分布特点，通过现场试验研究了真空预压 作用下吹填淤泥土的沉降和强度变化特性，指出吹填淤泥土为大变形沉降，固结和强度提高较慢，加密排水板可促进淤泥土 的排水固结，增大沉降，泥面铺设土工布有利于真空压力的平面传递和排水固结。分析了抽真空过程中排水板周围淤泥抱团 区的土性、颗粒组成和强度变化，指出吹填淤泥土颗粒细、结构性强度低、含水率高、流动性大是形成淤泥抱团的主要原 因，提出了解决设想。 关键词：吹填淤泥；真空预压；软土地基；固结；强度 中图分类号：TU 472 文献标志码：A 文章编号：1002-4792 （2010）04-0115-08 Experimental study on dredger fill sludge improved by vacuum preloading TANG Tong-zhi, HUANG Jia-qing, GUAN Yun-fei, CHEN Hai-bo, CHENG Wan-zhao （Nanjing Hydraulic Research Institute, Nanjing 210029, China） Abstract: Some characteristics of fresh dredger fill sludge in a coastal area including physical and mechanical performances, grain composition and strength distribution are analyzed. The settlement and strength change of dredger fill sludge in the course of vacuum preloading is studied by in-site experiment and model test. It shows that the settlement of dredger fill sludge is larger, and the rate of consolidation and strength increase is slower in contrast with general soft clay. The drainage consolidation effect and settlement of dredger fill sludge will be improved and increased while the space between the prefabricated vertical drain (PVD) is reduced. The geotextile laying in the surface of sludge is useful for vacuum pressure plane transfer and drainage consolidation. A thick sludge membrane appeared around the prefabricated vertical drain (PVD) is observed in the course of in-site and model test, and the physical and mechanical para