Correlation between shear wave velocity and cone resistance of Quaternary glacial clayey soils defined by Seismic Cone Penetration Test (SCPT), Lithuania

The correlation between the cone resistance and the shear wave velocities was derived for the Quaternary glacial clayey soil (moraine) using Seismic Cone Penetration Test (SCPT) technique. The correlation obtained between two parameters is as high as +0.73. The derived regression equation has significant differences from those of clayey soils reported from other regions that are accounted to different genetic type of sediments and evolutionary history. Accordingly the obtained results can be applied in defining the dynamic geotechnical properties of glacial clayey soils of Lithuania and other regions that have similar geological conditions (i.e. formerly glaciated areas)

Problems of Correlation Between Dynamic Probing Test (DPSH) and Cone Penetration Test (CPT) for Cohesive Soils of Lithuania

The paper analyses problems of correlation between the results of dynamic probing (DPSH – Super heavy dynamic probing) and cone penetration test. According to investigations of geological cross-sections of cohesive soils of the territory of Lithuania correlation dependencies are evaluated. Reliability of dynamic probing and modern methods of results correction are discussed. Effect of DPSH rods and lateral stress of soils to the results of probing is evaluated. Correlation dependencies between blow count N and depth of probing and cone resistance qc for various cohesive soils found in the territory of Lithuania

Klaipėdos uosto smulkiųjų gruntų savybių ypatumai

In the article, taking Klaipėda quays 7, 8 and 9 as examples, peculiarities of fine soil (silty clay, silty sandy clay and clayey silt) grain size distribution, physical state and mechanical properties are discussed. It was established that in these soils of a very similar physical state, the grain composition determines their mechanical properties.Lietuviška santrauka. Klaipėdos uosto krantinių rekonstrukcijos vietose yra sudėtingas geologinis pjūvis. Nors didesniąją pjūvio dalį sudaro glacigeninės kilmės smulkieji rišlūs gruntai, tačiau juose randama dulkingo molio tarpsluoksnių ir intarpų. Statybos metu jie gali išmirkti ir būti išplauti. Atlikti tyrimai rodo, kad smulkiųjų gruntų rūšys – tai moreninis dulkingas molis, moreninis dulkingas smėlingas molis ir nemoreniniai molingi dulkiai. Visi minėti gruntai pasižymi panašia fizine būkle, tačiau skirtinga granuliometrinė sudėtis lemia įvairias stiprumo rodiklių vertes ir jų pokyčius esant skirtingomis ašinėmis deformacijomis

Problems of Usage of Soil Classification Systems for Sand Soils of Lithuania

Sand soils cover approximately 30 % of the territory of Lithuania. They are frequently used as foundation for different buildings. Lately, in geotechnical investigations, classification of sand soils according to their grain size distribution has been based on different classification schemes: Lithuanian (LST 1445:1996, LST 1331:2002), German (DIN 18196), United Kingdom (BS 5930:1990), USA (ASTM D2487-06e1), European (EN ISO 14688-2:2004), and Russian (GOST 25100-82). In Lithuania, in different classifications, principles for sand division are various. The purpose of this article is to assess similarities and differences of classification of sand soils according to their grain size distribution based on investigations of sand soil grain size distribution and of mechanical properties using different classification systems

Investigation of Geofiltration Properties of Clay Soils

Filtration properties of clay (Kuksa mine, Lithuania) were investigated and analysis of the results was done. Investigations were carried out using a permeameter with a varying hydraulic head. A potential dependence of the clay hydraulic conductivity values on the filtration process duration as well as hydraulic gradient and compaction range were determined. The importance of the clay structural peculiarities, carrying out filtrations through clay paste, natural structure and compacted samples was evaluated. It was determined that the clay hydraulic conductivity values varied greatly only at the beginning of the filtration while, later on, when continuing the filtration for a few days, the change reduced. This shows that, during the filtration, there are structural clay-forming unit rearrangements that are taking place. The filtration investigation of the clay paste studies show that there exist clay structural links different changes the filtration capacity of clay. The determined varying behaviour of the clay and the clay paste in the course of filtration as well as under various loads must be evaluated in the design and reconstruction of roads with subgrade of the clayey soils

Correlation of shear-wave velocities and cone resistance of quaternary glacial sandy soils defined by seismic cone penetration test (SCPT)

The derivation of dynamic geotechnical parameters of soil are of primary importance in designing specific structures. Direct measurements are expensive and time-consuming. In this study the correlation between the seismic wave velocities and cone resistance was derived from seismic cone penetration testing (SCPT) of Quaternary glacial sandy soils in Lithuania. The close relationship was obtained for sandy soils indicating wide range of cone resistance and seismic wave velocities. The correlation is as high as R = 0.80. The derived regression equation could be reasonably used in assessing dynamic geotechnical and seismic parameters in Lithuania and other territories characterized by similar geological conditions using conventional cone penetration testing (CPT) method. It enables consistent geotechnical and seismic zoning of sandy soils