Combining NSP- and CPTu-based Nkt to evaluate undrained shear strength

IF 0.9 Q4 GEOSCIENCES, MULTIDISCIPLINARY
G. W. Quiros, Patricia M. Peters, Kuat C. Gan
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引用次数: 0

Abstract

A procedure for estimating reliable ranges of Nkt for direct simple shear (DSS)-based and anisotropically consolidated triaxial compression (CAUC)-based undrained shear strength is presented. The procedure is based on a combination of three Normalized Soil Parameter (NSP) methods and two CPTu (piezocone penetrometer) methods and are related to the ratio of net cone resistance to hydrostatic effective vertical stress. The NSP and CPTu data used were acquired from seven sites: these sites have stress histories ranging from very underconsolidated to very highly overconsolidated. The stratigraphies of the seven sites consist of clays that are moderately plastic to highly plastic. This proposed procedure was then applied to 22 published sites with a wide range of fine-grained soil types and index properties. The procedure yielded very consistent and reasonable envelopes of Nkt, which in turn, provide sound DSS-based strength profiles as well as CAUC-based strength profiles. The proposed procedure also clearly demonstrates that the range for Nkt factors is not limited to 15 to 20 for normally consolidated to lightly overconsolidated cohesive sediments, which is frequently employed by practitioners.
结合NSP-和cptu -基于Nkt评价不排水抗剪强度
提出了一种估算基于直接单剪(DSS)和基于各向异性固结三轴压缩(CAUC)的不排水抗剪强度Nkt可靠范围的方法。该程序基于三种归一化土壤参数(NSP)方法和两种CPTu(压电锥贯入计)方法的组合,并与净锥阻力与静水有效垂直应力的比率有关。所使用的NSP和CPTu数据来自7个站点:这些站点的应力历史从非常欠固结到非常高度过度固结不等。这七个地点的地层由中等塑性到高度塑性的粘土组成。然后将该建议的程序应用于22个已发表的站点,这些站点具有广泛的细颗粒土壤类型和指数属性。该过程产生了非常一致和合理的Nkt包层,这反过来又提供了基于dss的强度分布图和基于caucs的强度分布图。拟议的程序还清楚地表明,对于通常固结到轻度过度固结的粘性沉积物,Nkt因子的范围不限于15至20,这是从业者经常使用的。
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来源期刊
AIMS Geosciences
AIMS Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
7.70%
发文量
31
审稿时长
8 weeks
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