Vpliv dodatka bentonita na geomehanske lastnosti zemljin

diplomska naloga št.: 126/B-VOI

Marija Rakita (Author), Janko Logar (Mentor), Jasna Smolar (Co-mentor)

Abstract

Bentonit je glina z visoko vodovpojnostjo in nabrekalnim potencialom. Predhodne raziskave kažejo, da dodatek bentonita poveča vlažnost tal in zalogo vode v tleh, ter da se lahko uporablja za izboljšanje tal. V diplomski nalogi smo preiskali vpliv dodatka bentonita na geomehanske lastnosti organske gozdne zemljine odvzete na Ljubelju, v sklopu projekta ONEforest. Zasledovali smo vpliv dodatka dveh različnih vrst bentonita na sposobnost vpijanja in zadrževanja vode, vodoprepustnost, sukcijo, drenirano strižno trdnost in stisljivost. Primerjali smo rezultate laboratorijskih preiskav zemljine z različnimi deleži dodatka (0,4 m% - 8,0 m%) kalcijevega in aktiviranega natrijevega bentonita, ki ima večjo sposobnost vpijanja vode in večji nabrekalni potencial od kalcijevega. Rezultati kažejo, da dodatek bentonita poveča vodovpojnost in zmanjša vodoprepustnost zemljine. Zaradi dodatka bentonita se zmanjša strižni kot, nekoliko poveča pa se kohezija zemljine. Na sukcijo in stisljivost pa preiskani vrsti bentonita in v deležih, ki smo jih primešali zemljini, nimajo pomembnega vpliva. Dodatek bentonita je pokazal potencial za izboljšanje zadrževanja vode v tleh v majhnih odmerkih, kar spodbuja rast rastlin, ki kasneje s svojimi koreninami zagotavljajo odpornost proti eroziji tal. Priporočljive so nadaljnje raziskave bentonita, ker je stroškovno učinkovit in ni biorazgradljiv, po čemer se tudi razlikuje od biopolimerov, ki po določenem času izgubijo svojo učinkovitost.

Keywords

gradbeništvo;diplomske naloge;UNI;VOI;B-VOI;bentonit;zemljina;vodoprepustnost;vodovpojnost;sukcija;drenirana strižna trdnost;stisljivost;

Data

Language:	Slovenian
Year of publishing:	2023
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[M. Rakita]
UDC:	624.131(043.2)
COBISS:	178698499
Views:	190
Downloads:	43
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Effect of bentonite addition on geomechanical properties of soils
Secondary abstract:	Bentonite is a highly absorbent clay with swelling tendency. Previous research shows that adding bentonite to soil increases soil moisture and water retention in the soil. It can also be used to improve and stabilize soil. In this thesis, we examined the influence of bentonite addition on the geomechanical properties of the soil taken from Ljubelj as a part of the ONEforest project. We examined the influence of bentonite addition on the ability to absorb and retain water, water permeability, suction, drained shear strength and compressibility. We compared the differences between the addition of calcium and activated sodium bentonite, considering that sodium bentonite has greater absorbtion and swelling abilities. The results show that the addition of bentonite increases the water absorption and decreases the water permeability of the soil with each addition of bentonite. Cohesion was increased, and shear angle was decreased with each addition, with the highest cohesion and the lowest shear angle being at the biggest addition of sodium bentonite. The addition of bentonite has no significant effect on suction and compressibility. The addition of bentonite has shown potential to improve water retention in soil at low doses, promoting the growth of plants that later provide resistance to soil erosion through their roots. Further research on bentonite is recommended, due to its cost-effectiveness and non-degradability, which distinguishes it from biopolymers, which lose their effectiveness over time.
Secondary keywords:	graduation thesis;civil engineering;bentonite;soil;water permeability;water absorption;suction;drained shear strength;compressibility;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XIV, 39 str.
ID:	22264494