Statistical Analysis of Cone Penetration Tests and Soil Engineering Parameters at the National Geotechnical Experimentation Clay Site, Texas A&M University (original) (raw)
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Correlation of Standard and Cone Penetration Tests: Case Study from Tekirdag (Turkey)
IOP Conference Series: Materials Science and Engineering
In geotechnical engineering, the Standard Penetration Test (SPT-N value) is often used as an in-situ test. The Cone Penetration Test (CPT) is based on design and cone resistance (qc) and is becoming increasingly widespread. However, there is also a need for a SPT-CPT correlation association that can be used in the basic design. In this study, the values of the SPT-CPT tests applied to the ground were compared and tried to generate a certain statistical data. SPT and CPT experiments were performed side by side to determine the soil properties. Formulas have been developed using various statistical methods and correlation coefficients have been established between the data obtained for "high-medium-low plastic clay" and "sand and sandy clayey soils". The obtained data were compared with the studies in the literature.
Evaluation of Cone Penetration Test (CPT) Classification Methods for some Local Soils
The paper presents a comparison between soil classification based on the Cone Penetration Test (CPT) charts reported in the literature and the actual soil classification obtained by direct boring and laboratory test results. Three sites in Khartoum state, resembling 3 different soil types, were chosen . Boreholes were drilled using conventional soil mechanics rigs. CPT Soundings were performed at each site very near to the positions of the boreholes. The soil classification predicted by the theoretical approaches was compared with the observed soil borehole logs obtained by direct boring and laboratory tests. It is concluded that non of the theoretical approaches gave satisfactory results for the three soil stratification observed in the actual bore holes at the three locations in Khartoum state. Hence further research is recommended for correlating CPT results and soil stratification in different types of soils in Khartoum State.
Stress History of Soils from Cone Penetration Tests
Soils and Rocks, 2017
Stress history is an important measurement in soils as it affects strength, stability, stiffness, and flow characteristics. The evaluation of the in-situ preconsolidation stress, or effective yield stress, from the results of piezocone penetration tests allows for an economical and expedient means to profile the stress history of clays, sands, and mixed soil types on geotechnical projects. The methodology is based on a derived analytical cavity expansion-critical state solution for clays and statistical inversion of data from calibration chamber tests on sands. Applications are given for case studies involving clay, silt, and sand where laboratory consolidation tests provide benchmark values for the stress history. Since yield stress demarcates contractive vs. dilative soil behavior, extended uses in screening soil susceptibility for concerns involving flow and cyclic liquefaction are also presented.
Use of Static Cone Penetration Test for Classification of Local Soils
2016
This paper presents an updated and modified version of a previously developed numerical soil classification method based on analysis of data from the static cone penetration test CPT. Relevant data was obtained in the study for over 900 samples representing various soil types collected from many sites located in different parts of Sudan. Classification of studied soils was made according to the Unified System for Classifying Soils (USCS) using the results of standard tests performed in the laboratory on representative samples. The cone resistance q c and friction ratio R f were obtained for each soil type from CPT soundings made adjacent to boreholes at the same sample depths in each site. The ‘discriminant’ concept of statistical analysis was employed for proposing a numerical classification method that assigns a given soil to one of five main groups selected on soil type basis following the USCS scheme. A computer program that automatically predicts the type of penetrated soil ac...
Cone Penetration Test to Assess the Mechanical Properties of Subgrade Soils
1998
The scope of this research project was to develop an interpretational tool, which could make the dynamic cone penetrometer test (DCPT) a practical and simple technique for assessing the in-situ soil characteristics under the pavement in the approximate zone of influence of traffic. Also, DCPT could be employed to determine the densities of the compacted subgrade instead of other methods. This method could also be employed to verify the INDOT proof-rolling operation. These tasks became the objective of this study.
Case Study: use of correlations between SPT and CPT data from geotechnical investigation to understand soil properties, 2021
This article present data from a subsurface exploration analysis is ascertaining the various soil profile components at test locations, providing laboratory test results for use by the design engineers in preparing and installation techniques, record groundwater levels at the time of the investigation and discuss the potential impact on the proposed construction. Usually the scope of the exploration and analysis included site geologic research and evaluation, subsurface exploration, field testing and sampling, laboratory testing, geotechnical engineering analysis and evaluation of the subsurface materials.
The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2012
As a support for a future construction, geotechnical soil characterization is necessary by laboratory testing or in situ probing methods for optimal choice of foundation system, and for avoiding that the soil foundation will not reach the ultimate limit states or the serviceability limit states. Most of in situ methods of probing the soil foundation are made discontinuously by meter to meter, having the disadvantage that cannot provide geotechnical information for the entire depth of the investigated area. Cone Penetration Tests (CPT) and cone penetration tests with pore water pressure measurement (CPTu), are among the only tests that provide accurate information about the stratigraphic limits, lithologic anomalies and soils type as a result of continuous records of the geotechnical parameters of the foundation soil for the entire study area.
State Parameter Interpretation of Cone Penetration Tests in Agricultural Soils
Cone penetrometer resistance in saturated sands has been shown by earlier workers to be an exponential function of a state parameter in critical state space. The present investigation demonstrates that this concept of a state parameter-penetrometer function (SPP-function) also holds good in a partly saturated agricultural soil. The two coefficients which characterize the SPP-function have been evaluated from extensive tests carried out in a miniature penetrometer calibration chamber. These coefficients were found to vary in a systematic manner with the moisture content of the sandy loam soil used in the experiments, as do the three basic parameters necessary to characterize the critical state boundaries of this soil. The paper presents a method of using this experimentally obtained information to interpret the pore space of the soil from measured penetrometer resistance in that soil. The performance of the proposed method was checked against penetrometer readings made under carefully controlled laboratory conditions in an indoor soil tank. The prediction accuracy was poor, but it is felt that this could be improved by using an iterative solution in place of the single step method used in the validation. The tedious and time consuming experimental work described in the paper is confined to a single sandy loam soil, typical of a light agricultural soil. In order to generalize the solution, it is necessary to test the procedure over a wide range of soils, including clay. If the SPP-functions can be established for these conditions then the state parameter concept could prove to be a powerful tool in the interpretation of cone penetrometer readings. #