Tom Lunne

Bio: Tom Lunne is an academic researcher from Norwegian Geotechnical Institute. The author has contributed to research in topics: Cone penetration test & Oedometer test. The author has an hindex of 19, co-authored 58 publications receiving 2744 citations.

Cone Penetration Testing in Geotechnical Practice

Abstract: Preface. Acknowledgements. Symbol List. Conversion Factors. Glossary. 1. Introduction. 2. Equipment and procedures. 3. Checks, corrections and presentation of data. 4. Standards and specifications. 5. Interpretation of CPT/Piezocone data. 6. Direct application of CPT/CPTU results. 7. Additional sensors that can be incorporated. 8. Geo-Environmental applications of penetration testing. 9. Examples. 10. Future trends. References. Appendices. Index.

Effects of sample disturbance and consolidation procedures on measured shear strength of soft marine Norwegian clays

Abstract: After many decades of research, the issue of sample disturbance is still important as regards to determining reliable and representative soil parameters for foundation design in soft clays. Paralle...

Estimating coefficient of consolidation from piezocone tests

Abstract: Data have been reviewed from sites in Europe and North and South America as well as published data from South Africa. The review has concentrated on dissipation data from piezocone tests (CPTU) to ...

Use of In Situ Tests for Foundation Design on Clay

Abstract: Years of evaluated experience with the field vane test in soft clays have resulted in empirical correction factors well suited for design practice. An extension of L. Bjerrum's correction curve is presented. Results show that the field vane test interpreted with the results from a triaxial compression test can predict the in situ coefficient of earth pressure at rest, K//o. The piezocone test combines wide applicability and cost-effectiveness and is excellent to investigate soil variability. Correlations of the corrected cone resistance to undrained shear strength indicate that the cone factor depends on plasticity index, soil anisotropy and strain rate effects. The paper stresses the importance of correlating the cone factor to a well defined and relevant reference undrained shear strength.

The strength and dilatancy of sands

Abstract: Extensive data of the strength and dilatancy of 17 sands in axisymmetric or plane strain at different densities and confining pressures are collated. The critical state angle of shearing resistance of soil which is shearing at constant volume is principally a function of mineralogy and can readily be determined experimentally within a margin of about 1°, being roughly 33° for quartz and 40° for feldspar. The extra angle of shearing of ‘dense’ soil is correlated to its rate of dilation and thence to its relative density and mean effective stress, combined in a new relative dilatancy index. The data of o′max – o′crit in triaxial or plane strain are separately fitted within a typical margin of about 2°, though the streneth of certain sands is underpredicted in the 1000–10000 kN/m2 range owing to the continued dilation of their crush-resistant grains. The practical consequences of these new correlations are assessed, with regard to both laboratory and field testing procedures. L'auteur analyse de nombreuses d...

Soil Behaviour and Critical State Soil Mechanics

Abstract: Soils can rarely be described as ideally elastic or perfectly plastic and yet simple elastic and plastic models form the basis for the most traditional geotechnical engineering calculations. With the advent of cheap powerful computers the possibility of performing analyses based on more realistic models has become widely available. One of the aims of this book is to describe the basic ingredients of a family of simple elastic-plastic models of soil behaviour and to demonstrate how such models can be used in numerical analyses. Such numerical analyses are often regarded as mysterious black boxes but a proper appreciation of their worth requires an understanding of the numerical models on which they are based. Though the models on which this book concentrates are simple, understanding of these will indicate the ways in which more sophisticated models will perform.

Interpretation of cone penetration tests — a unified approach

Abstract: The electric cone penetration test (CPT) has been in use for over 40 years and is growing in popularity in North America. This paper provides some recent updates on the interpretation of some key g...

The interpretation of in situ soil tests

Abstract: The purposes of in situ testing are set out, and the difficulties of the interpretation of the observations are emphasized. These difficulties are due to the complex behaviour of soils together with the lack of control and of choice of the boundary conditions in any field test. One notable exception is the pressuremeter test, from which soil properties can be derived directly without recourse to empirical correlations. The discussion is concentrated on the measurement of undrained shear strength. The results obtained from different tests (triaxial, plane strain, direct simple shear, pressuremeter and vane) are compared by expressing them in terms of the undrained strength ratio su/σv0′ as a function of the friction angle φ. Special attention is paid to tests in which the principal axes of stress and of strain increment are free to rotate. In such tests, uncertainty exists regarding the definition of failure and the planes of maximum stress obliquity. To derive these functions Matsuoka's failure criterion ...

Interpretation of cone penetration tests. Part I: Sand

Abstract: Significant advances have been made in recent years in research, development, interpretation, and application of cone penetration testing. The addition of pore pressure measurements during cone pen...