含水层试验井回填层比贯入阻力分布特性研究  

Study on distribution characteristics of backfilled layer ps values in aquifer test well

作　　者：张国伟 Zhang Guowei(Shanghai Shannan Investigation&Design Co.,Ltd.,Shanghai 201206,China)

机构地区：[1]上海山南勘测设计有限公司,上海201206

出　　处：《工程勘察》2025年第2期38-43,共6页Geotechnical Investigation & Surveying

摘　　要：含水层试验井井壁与回填层界面的侧摩阻力是制约试验井能否拔除的关键因素。静力触探成果可以有效地评价桩土界面的侧摩阻力,本文针对试验井开展了原位的静力触探测试,通过分析不同回填层的比贯入阻力分布特征,发现各回填层的ps值均符合Weibull分布,浅部黏性土回填层以及深部中粗砂回填层的ps值都呈现出随着深度增加而增大的趋势,而黏土球回填层在上下界面处存在明显的界面效应,在土性相近的界面表现为滞后影响,土性差异较大的界面主要是超前影响。The lateral fraction of the aquifer test well and the back-filled layers is the key factor restricting whether the test well can be pulled out.The cone penetration test(CPT)can be used to evaluate the lateral fraction of pile-soil interface effectually.A CPT in aquifer test well is conducted in this paper,after analyzing the distribution characteristics of the specific penetration resistance(ps)of different backfilled layers,it indicates that the ps values of different backfilled layers are according to Weibull distribution,the ps values of the clay-backfilled layer and the medium-coarse-sand-backfilled layer increase proportionally with depth,the ps value nearby the interface of different backfilled layers is affected by upper layer or lower layer.The interfaces with similar soil properties exhibit lagging effects,while the interfaces with significant differences in soil properties are mainly influenced by leading effects.

关 键 词：试验井回填层 静力触探 界面效应 WEIBULL分布 

分 类 号：TU411.2[建筑科学—岩土工程]