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真空预压法加固广州南沙港区软基现场试验研究
作者:陈平山 董志良 张功新  
单位:中交四航工程研究院有限公司  
关键词:真空预压  大面积软基  现场试验  沉降  侧向位移  加固效果 
分类号:U655.54
出版年,卷(期):页码:2009,33(6):45-49
摘要:
为研究真空预压加固大面积软基的变形及孔压变化规律,在广州南沙港真空预压试验区对地表沉降、分层沉降、侧向位移和孔压变化等进行了监测,并分析了实测数据。现场试验表明:真空预压法能使地基产生较大的沉降速率,且工后沉降较小;加固深度主要在塑料排水板打设深度范围内,但影响深度可达该深度以下3~4 m处;边界处土层沉降较小,但侧向位移较大。通过比较加固前、后土样的物理力学指标,说明真空预压法加固大面积超软弱淤泥土效果显著。
To study the laws of displacement and pore-water pressure variations induced by the improvement of large area soft ground by vacuum preloading,the details of settlements,multi-point settlements,deep horizontal displacement and pore pressure variations were monitored and analyzed in testing area strengthened by vacuum preloading in Guangzhou Nansha Port.Field experiment showed that vacuum preloading can cause more settlement velocity and less post-construction settlement,and the effective improving depth was mainly in the range of the depth of PVD while the influenced depth was 3 ̄4 m below the bottoms of PVD.The settlement of clay on the boundary of foundation was less than that of soil inside the ground,while the horizontal displacement was over than that of other areas.The physical and mechanical indexes before and after soil improvement were compared,which indicated the super-soft reclamation silt was strengthened greatly by vacuum preloading.
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参考文献:
[1]Kjellman W.Consolidation of clay by means of atmospheric pressure[C]//Proc.Conference on soil stabilization MIT.Boston,1952. [2]邓龙照,柯朝晖.大面积真空预压在南沙一期工程中的成功应用[J].水运工程,2004(03):115-120. [3]朱平,闫澍旺,刘润,等.真空预压法加固路堤软基的工程实例分析[J].岩土工程学报,2003,25(4):508-510. [4]姜增国,姚志安.真空预压方法在沿海软基处理中的应用及效果分析[J].岩土工程技术,2005,19(1):36-38. [5]张功新.真空预压加固大面积超软弱吹填淤泥土试验研究及实践[D].广州:华南理工大学,2006. [6]焦淑贤.真空预压法在广州南沙港区特殊地基上的应用[J].水运工程,2003,(10):55-58. [7]娄炎.真空排水预压法加固软土技术[M].北京:人民交通出版社,2002.
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