Pomen zgoščenosti in vlage na trdnost in vodoprepustnost zemljin

diplomska naloga št.: 423/B-GR

Ana Konkolič (Author), Janko Logar (Mentor), Jasna Smolar (Co-mentor)

Abstract

V sklopu diplomske naloge smo preučevali vpliv vlage na zgoščenost ter vpliv zgoščenosti na trdnost, stisljivost in vodoprepustnost zemljine. Laboratorijske preiskave smo izvedli na vzorcu kraške gline, klasificirane kot mastna glina (CH). Za ugotavljanje optimalne vlage in maksimalne suhe gostote kraške gline smo najprej izvedli standardni Proctorjev preskus (SPP), nato pa smo na različno vlažnih nabitih preizkušancih izmerili tlačno in strižno trdnost, stisljivost in vodoprepustnost po dveh standardnih postopkih. Rezultati preiskav kažejo, da vlaga in zgoščenost nimata značilnega vpliva na drenirano strižno trdnost kraške gline, medtem ko so ostali preiskovani parametri stanja odvisni od obeh parametrov. Višja vlaga nabitih preizkušancev rezultira v nižjo enoosno tlačno trdnost, bolj vlažni preizkušanci so tudi bolj stisljivi. Kraška glina, nabita pri vlagah, ki so nižje od optimalne, je občutljiva na vplive vode. To se kaže v bistveno nižji enoosni tlačni trdnosti saturiranih preizkušancev v primerjavi z enoosno tlačno trdnostjo nesaturiranih preizkušancev, nabitih pri primerljivi začetni vlagi. Tudi pri preiskavi stisljivosti smo zaznali nabrekanje preizkušancev, nabitih pri vlagi, ki je nižja od optimalne, kar je posledica preplavitve. Meritve vodoprepustnosti v permeametru s spremenljivim hidravličnim padcem generalno kažejo upad koeficienta vodoprepustnosti z višanjem vlage in bremenske stopnje. Podobnega vzorca obnašanja pri meritvah koeficienta vodoprepustnosti v triosni celici nismo prepoznali. Na podlagi odstopanj v izmerjenih koeficientih vodoprepustnosti tudi ugotavljamo, da je izmerjena vrednost koeficienta vodoprepustnosti odvisna od uporabljene metode merjenja.

Keywords

gradbeništvo;diplomske naloge;UNI;GR;B-GR;Standardni Proctorjev preskus;vlaga;zgoščenost;parametri stanja;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[A. Konkolič]
UDC:	535.345:624.131.37(043.2)
COBISS:	126069251
Views:	62
Downloads:	17
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	ǂThe ǂimportance of compaction and water content on strenght and water permeability of soils
Secondary abstract:	n the thesis, the effect of water content on compaction and the effect of compaction on strength, compressibility and water permeability of the soil were investigated. Laboratory tests were carried out on a sample of karst clay, classified as fat clay (CH). To determine the optimum water content and maximum dry density of the karst clay, the standard Proctor test (SPP) was performed. Then the uniaxial compressive and shear strength, compressibility and water permeability, using two standard procedures, were measured on differently moisturized compacted specimens. The results show that water content and compaction have no significant effect on the drained shear strength of karst clay, while the other investigated state parameters depend on both. Higher water content of compacted samples results in lower uniaxial compressive strength. Samples with higher water content are also more compressible. Karst clay compacted at sub-optimal water content is sensitive to the effects of water. This translates into significantly lower uniaxial compressive strength of saturated specimens compared with uniaxial compressive strength of unsaturated specimens compacted at equivalent initial water content. In the compressibility test, swelling of samples that were compacted at sub-optimal water content, as a result of overflooding, was detected. Water permeability measurements in a permeameter with variable hydraulic gradient generally show a decline of water permeability coefficient with increasing water content and load step. We did not detect a similar pattern with water permeability coefficient measurements in the triaxial cell. Based on the deviations in measured water permeability coefficients, we also note that the measured value of water permeability coefficients depends on the measurement method used.
Secondary keywords:	graduation thesis;civil engineering;Standard Proctor test;water content;compaction;state parameters;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	X, 33 str.
ID:	16901257