Kvartāra mālaino grunšu drenētas bīdes stiprības noteikšana ar tiešās bīdes metodi
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Latvijas Universitāte
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lav
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Kvartāra mālaino grunšu drenētas bīdes stiprības noteikšana ar tiešās bīdes metodi. Tračevska D., darba vadītājs asoc. prof., Dr.ģeol. Māris Krievāns. Bakalaura darbs, 59 lapaspuses, 21 attēls, 7 tabulas, 31 literatūras avoti, 1 pielikums, latviešu valodā. Bakalaura darbā analizēta kvartāra glacigēno un glaciolimnisko mālaino grunšu drenētā bīdes stiprība, izmantojot tiešās bīdes metodi. Literatūras analīzē aplūkoti bīdes pretestības parametri un to izmaiņas pārkonsolidētās gruntīs, īpaši uzsverot Kulona sabrukšanas robežas nelinearitātes aspektus. Darba mērķis ir izvērtēt, kā normālā sprieguma izvēle ietekmē testēšanas rezultātus un to atbilstību reālajiem apstākļiem. Eksperimentālajā daļā veikta astoņu netraucētu grunts paraugu laboratoriskā testēšana, pielietojot standarta tiešās bīdes metodi drenētos apstākļos, un noteikti būtiskākie fizikālie parametri – ūdens saturs, cieto daļiņu blīvums, kā arī plūstamības un plastiskuma robežas. Iegūtie dati neuzrāda konsekventu korelāciju starp normālā sprieguma līmeni un pārkonsolidētu grunšu bīdes pretestības parametriem, kas liecina par nepieciešamību individuāli pielāgot testēšanas apstākļus, ņemot vērā konkrētā grunts masīva sprieguma-deformācijas vēsturi un iespējamās strukturālās īpatnības. Darba rezultāti veicina izpratni par drenētas bīdes stiprības raksturlielumu interpretāciju un sniedz praktiskas rekomendācijas ģeotehniskās izpētes kvalitātes uzlabošanai inženierģeoloģiskajos novērtējumos.
Determination of drained shear strength of Quaternary clayey soils by direct shear method. Tračevska D., thesis advisor asoc. prof., Dr. geol. Māris Krievāns. Bachelor's thesis, 59 pages, 21 figures, 7 tables, 31 sources, 1 appendix, in Latvian. The bachelor's thesis analyzes the drained shear strength of Quaternary glacial clayey soils using the direct shear method. The literature analysis examines the shear resistance parameters and their changes in overconsolidated soils, with special emphasis on the nonlinear aspects of the Coulomb failure limit. The aim of the work is to evaluate how the chosen values for normal stress affect the testing results and their compliance with real conditions. In the experimental part, laboratory testing of eight undisturbed soil samples was carried out using the standard direct shear method under drained conditions, and the most important physical parameters were determined - water content, solid particle density, as well as liquidity and plasticity limits. The obtained data do not show a consistent correlation between the level of normal stress and shear resistance parameters of overconsolidated soils, which indicates the need to individually adjust the testing conditions, taking into account the stress-strain history of the specific soil mass and possible structural features. The results of the work contribute to the understanding of the interpretation of drained shear strength characteristics and provide practical recommendations for improving the quality of geotechnical investigation in geological engineering assessments.
Determination of drained shear strength of Quaternary clayey soils by direct shear method. Tračevska D., thesis advisor asoc. prof., Dr. geol. Māris Krievāns. Bachelor's thesis, 59 pages, 21 figures, 7 tables, 31 sources, 1 appendix, in Latvian. The bachelor's thesis analyzes the drained shear strength of Quaternary glacial clayey soils using the direct shear method. The literature analysis examines the shear resistance parameters and their changes in overconsolidated soils, with special emphasis on the nonlinear aspects of the Coulomb failure limit. The aim of the work is to evaluate how the chosen values for normal stress affect the testing results and their compliance with real conditions. In the experimental part, laboratory testing of eight undisturbed soil samples was carried out using the standard direct shear method under drained conditions, and the most important physical parameters were determined - water content, solid particle density, as well as liquidity and plasticity limits. The obtained data do not show a consistent correlation between the level of normal stress and shear resistance parameters of overconsolidated soils, which indicates the need to individually adjust the testing conditions, taking into account the stress-strain history of the specific soil mass and possible structural features. The results of the work contribute to the understanding of the interpretation of drained shear strength characteristics and provide practical recommendations for improving the quality of geotechnical investigation in geological engineering assessments.