吹填细砂软弱地基处理试验研究.pdfVIP

第29卷第4期 岩 土 力 学 Vb1．29 NO．4 2008年4月 Rock and Soi1 Mechanics Apr 2008 文章编号l 1000--7598--(2008)04--859--06 吹填细砂软弱地基处理试验研究 周 健，崔积弘，贾敏才，史旦达 (同济大学 地下建筑与工程系，上海 200092) 摘 要：结合实际工程情况，针对吹填细砂及下卧软黏土地基的工程性质，对强夯．降水联合法和无填料振冲法结合整体塑 料排水板加固此类地基的适用性进行了试验研究。在试验的基础上，确定了振冲施工工艺的振冲间距、上拔间距等振冲大面 积施工参数，同时分析了强夯过程中下卧黏性土中孔隙水压力的增长消散过程及影响因素，得到了一些有益的结论，对类似 工程有一定的借鉴意义。 关 键 词：强夯；吹填细砂；真空井点降水；无填料振冲法；地基处理 中图分类号：Tu 441 ．8 文献标识码：A In—situ test study on ground treatment of hydraulic fine soils ZHOU Jian，CUI Ji-hong，JIA Min-cai，SHI Dan—da (Department of Geotechnical Engineering，Ton~i University,Shanghai 200092，China) Abstract：According to Shanghai harbor ground treatment project，considering the engineering properties of fine sands and disturbed soft soils underlying it，method of PVD—improved subsoil with two technologies of vibroflotation compaction without additional stone aggregates for improving fine sands as well as well dewatering combining with dynamic consolidation for strengthening the disturbed soft soils underlying the hydraulic fine sands is introduced．Based on results of field tests，large—area vibroflotation compaction construction parameters are determined；and the increasing and dissipation regularity of excess pore water pressure in different soil layers and its influencing factors are analysed．Finally，some useful conclusions are drawn． Key words：dynamic consolidation；hydraulic fine sands；vacuum well dewatering；vibroflotation without additional backfill materials；ground treatment 程中应用存在一定的技术优势。对于无填料振冲法 1 前 言 的适用范围，国内外一般认为无填料振冲法仅适用 振冲法加固砂土类地基，一方面是依靠振冲器 于小于0．074 mm的细粒含量不超过1O％的中、粗 的强力振动和水冲，伎砂层发生