真空预压法及真空-堆载联合预压法的室内试验研究  

Laboratory test of vacuum preloading and vacuum combined surcharge preloading

作　　者：彭劼[1] 刘汉龙[1] 丰土根[1] Ali Hasson 

机构地区：[1]河海大学岩土工程研究所,南京210098

出　　处：《岩土力学》2005年第S2期103-106,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50379010)

摘　　要：通过室内试验,研究了试样在模拟的堆载预压、真空预压、真空-堆载联合预压以及各向等压4种情况下土体的固结变形特性。结果表明,在真空预压模拟试验情况下,试样的变形、加固情况等指标与各向等压模拟试验下的情况很接近,即:试样的竖向变形小于堆载预压模拟试验情况下试样的竖向变形,土性改善程度要优于堆载预压的情况。而真空-堆载联合预压模拟情况下,试样的竖向变形大于真空预压的情况,加固效果好于堆载预压的情况,总体上具有更好的加固效果。Four kinds of laboratory experiments,those are vacuum preloading,surcharge preloading,vacuum combined surcharge preloading and each direction equal loading,were made to study the consolidation character of soil.The rcsuR shows that the deformation and improvement of soil of vacuum preloading is more close to that of each direction equal loading.The vertical deformation of vacuum prcloading sample is smaller than that of surcharge preloading;and the improvement degree of soil under vacuum preloading is better than that under surcharge preloading.The vertical deformation of vacuum combined surcharge prcloading sample is larger than that of vacuum preloading;and the improvement degree of soil of vacuum combined surcharge preloading is better than that of surcharge preloading.As a whole,the vacuum combined surcharge prcloading is most effective to improve the soft soil.

关 键 词：室内试验 真空预压 真空-堆载联合预压 固结 

分 类 号：TU472.33[建筑科学—结构工程]