Geosynthetic-encased stone columns - analytical calculation model

Boštjan Pulko (Avtor), Bojan Majes (Avtor), Janko Logar (Avtor)

Povzetek

This paper presents a newly developed design method for non-encased and encased stone columns. The developed analytical closed-form solution is based on previous solutions, initially developed for non-encased columns and for non-dilating rigid-plastic column material. In the present method, the initial stresses in the soil/column are taken into account, with the column considered as an elasto-plastic material with constant dilatancy, the soil as an elastic material and the geosynthetic encasement as a linear-elastic material. To check the validity of the assumptions and the ability of the method to give reasonable predictions of settlements, stresses and encasement forces, comparative elasto-plastic finite element analyses have been performed. The agreement between the two methods is very good, which was the reason that the new method was used to generate a parametric study in order to investigate various parameters, such as soil/column parameters, replacement ratio, load level and geosynthetic encasement stiffness on the behaviour of the improved ground. The results of this study show the influence of key parameters and provide a basis for the rational predictions of settlement response for various encasement stiffnesses, column arrangements and load levels. The practical use of the method is illustrated through the design chart, which enables preliminary selection of column spacing and encasement stiffness to achieve the desired settlement reduction for the selected set of the soil/column parameters. (C) 2010 Elsevier Ltd. All rights reserved.

Ključne besede

izboljšava tal;gruščnati slopi;geosintetiki;napoved posedanja;elasto-plastična rešitev;soil improvement stone;columns;geosynthetic;encasement;settlement;prediction;elastoplastic solution;

Podatki

Jezik:	Angleški jezik
Leto izida:	2010
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	Elsevier
UDK:	624.131
COBISS:	5133409
ISSN:	0266-1144
Št. ogledov:	2927
Št. prenosov:	971
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarne ključne besede:	izboljšava tal;gruščnati slopi;geosintetiki;napoved posedanja;elasto-plastična rešitev;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Delo ni kategorizirano
Strani:	str. 29-39
Letnik:	ǂLetn. ǂ29
Zvezek:	ǂšt. ǂ1
Čas izdaje:	feb. 2011
DOI:	10.1016/j.geotexmem.2010.06.005
ID:	8312317