土质修正系数β_0对湿陷性黄土场地的湿陷类型判定的影响

The Impact of Amended Soil Property Coefficient β_0 on Judging Collapsible Type in Loess Yard

土质修正系数β0值是判定湿陷性黄土湿陷类型的关键指标,不同的值对判定结论会产生很大的影响。按照《湿陷性黄土地区建筑规范》(GB50025-2004),山西的黄土地区,β0值可以有1.2和0.5两种选择。为了合理选定这一系数值,在地处湿陷性黄土地区的山西禹门口提水工程的PCCP项目上,沿管线48.8 km范围内,取土样49处,完成室内压缩试验200余组,并在管线现场进行了2组室外浸水试验,通过沉陷量的计算和比较,探讨了这一问题,并得出结论:在工程较为重要的地区,应增加室外试验予以判定。

The amended soil property coefficient β0 is the key index for judging collapsible type of loess.The different coefficient values can make big impact on judgement conclusion.Accoding to Code for building construction in collapsible loess regions（GB50025-2004）,in Shanxi＇s loess regions,two values of the coefficient can be selected,i.e.1.2 or 0.5.In order to reasonably select this coefficient,in PCCP works of Yumenkou Eastern Extension Pumping Project,along 48.8 km length range of pipe line,49 samples had be taken and above 200 iterms of laboratory test had be completed.Besides,2 groups of in-site immersion test had be carried out.Through computing the settlement vaues and comparing them,the selection issue is studied and one of the conclusions is that in important region,the in-site test must be increased for judgement job.