ǂThe ǂstability of the excavation face of shallow civil and mining tunnels

Abstract

The stability of the excavation face of shallow tunnels excavated in difficult ground conditions is currently a relevant problem in the sector for tunnelling and mining. Even though face-reinforcement interventions with fibreglass dowels have proved to be efficient, there is still no reliable analysis and dimensioning method available. A new calculation procedure is illustrated in this paper for the analysis of the face static condition in shallow tunnels, also when reinforcement interventions with fibreglass dowels are used. The procedure is based on the limit-equilibrium method applied to the ground core ahead of the face. The main result of the calculation is that the safety factor of the excavation face is also obtained in the presence of reinforcements and from this it is then possible to proceed with the dimensioning of the intervention. The procedure has been applied to two real cases and satisfactory results have been obtained.

Keywords

fibreglass dowels;face reinforcement;surface tunnel;limit equilibrium method;factor of safety;

Data

Language:	English
Year of publishing:	2011
Typology:	1.01 - Original Scientific Article
Organization:	UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC:	624.19.04
COBISS:	262546432
ISSN:	1854-0171
Parent publication:	Acta geotechnica Slovenica
Views:	664
Downloads:	74
Average score:	0 (0 votes)
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Other data

Secondary language:	Slovenian
Secondary title:	Stabilnost površine izkopa plitvih gradbenih in rudarskih predorov
Secondary abstract:	Stabilnost površine izkopa plitvih predorov, ki so bili izkopani na problematičnih tleh, je danes relevanten problem na področju gradnje tunelov in rudarstva. Čeprav je ojačitev s palicami iz steklenih vlaken učinkovita, še vedno ni zanesljivih analiz in obsežnih metod. V tem prispevku je prikazan nov računski postopek, ki analizira statične pogoje površine v plitvih predorih, tudi če so ojačani s steklenimi vlakni. Postopek temelji na omejeni ravnotežni metodi, uporabljeni na zemljišču pod površino. Najpomembnejši rezultat izračuna je, da lahko varnostni faktor izkopavanja površine izračunamo tudi, če je predor ojačan, iz česar potem lahko nadaljujemo z dimenzioniranjem posega. P. Oreste je izvedel postopek na dveh primerih in je dosegel zadovoljujoče rezultate.
Secondary keywords:	geotehnika;statika;predori;ojačitev;palice iz steklenih vlaken;modeli;
URN:	URN:SI:UM:
Type (COBISS):	Scientific work
Pages:	str. 56-65
Volume:	ǂVol. ǂ8
Issue:	ǂ[no.] ǂ2
Chronology:	2011
ID:	10941018