Robertson et al (1986) and Robertson (1990) stressed that the CPT-based charts were predictive of Soil Behavior Type (SBT), since the cone responds to the in-situ mechani-cal behavior of the soil and not directly to soil classification criteria based on grain-size distribution and soil plasticity (e.g. Unified Soil Classification System, USCS).

2016年7月14日 · CPT-based SBTn chart suggested by Robertson (1990) and updated by Robertson (2009). [Colour online.] Proposed Q tn-I G chart to identify soils with microstructure. Proposed updated SBTn chart...

Robertson (1990) suggested two charts based on either Q t -F r and Q t -B q but recommended that the Q t -F r chart (illustrated in Fig. 2) was generally more reliable, since the CPT penetration...

Robertson chart (Robertson 1990) for soil classification based on normalized CPTU data. This paper presents an application of the Bayesian Mixture Analysis (BMA) to deal with the classification...

1989 Several charts exist for evaluating soil type from &ctric cone penetration test (CpT) data. A new system is propowd based on normahzed CPT data. The new chans are based on extensive data available from published and unpublished experience worldwide.

The soil behavior type index can be thought of as a representative value that combines Qt and Fr to produce concentric circles delineating Robertson’s 1990 SBT chart zones. Ic expresses the radius of those concentric circles. There are two ways to correlate shear wave velocity with CPT cone resistance.

Twelve ´soil behaviour type` (SBT) zones were proposed by Robertson et al. (1986) and nine (SBTn) by Robertson (1990). Later, Robertson (2010) updated the early Robertson et al.´s (1986) method including a dimensionless cone resistance (qc/pa, where pa=atmospheric pressure) and reducing the number of SBT zones from 12 to 9 in order to

A popular CPT soil behavior chart based on normalized CPT data is that first proposed by Robertson (1990) and shown in Figure 23. The linear normalization suggested by Wroth (1984) was used: Q t or Q t1 = (q t - σ vo ) / σ’ vo

Robertson et al (1986) and Robertson (1990) stressed that the CPT-based charts were predictive of soil behavior, and suggested the term ‘soil behavior type’ (SBT), because the cone responds to the in-situ mechanical behavior of the soil (e.g. strength, stiffness and compressibility) and not directly to soil classification criteria using geologic...

The objective of this paper is to present an update to the Robertson (1990, 2009) and Schneider et al. (2008) CPT-based SBT classification system with behaviour-based descriptions for each soil group. The importance of microstructure and how it can influence CPT-based classification is …