Ground settlement induced by tunnel boring in stiff clay

Milaković, Davor; Szavits-Nossan, Antun

doi:10.14256/jce.1044.2014

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The stability of singular and twin tunnels has been studied in different kinds of soils [14][15][16][17][18] or rock masses [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…The stability of dual unsupported square sectioned tunnels in rock masses subjected to surcharge loading, obeying Generalized Hoek-Brown (GHB) failure criterion is investigated by Xiao et al [23]; the safety factor was calculated with changing center to center distance ratio, cover depth ratio, GSI (50, 60, 70, 80, 90, 100) and m i (5,10,15,20,25,30).…”

Section: Introductionmentioning

confidence: 99%

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The Effect of GSI and mi on the Stability of 3D Twin Tunnel in Limestone

Zenah,

Görög

2024

Period. Polytech. Civil Eng.

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The Generalised Hoek-Brown (GHB) failure criterion is one of the most used criteria to study the behaviour of the rocks; affected parameters of the Hoek-Brown equation are Geological Strength Index (GSI), intact rock constant (mi), and Disturbance factor (D). GSI is one of the rock classification systems used to evaluate jointed rocks. In light of this equation, this paper studies the stability of unsupported twin tunnels in a weak rock by changing the mentioned parameters (GSI, mi) to find the relation between the stability and these parameters under different distances between the centres of the tunnels (L). The tunnels have a circular cross-section with a diameter (B), and they have been modelled in three dimensions using Rocscience software package (RS3). The results showed that the stability of the tunnels, which was represented by the strength reduction factor (SRF), increased as a result of increasing L/B or GSI in the studied range; for mi , the modelling results showed that the SRF value increased while mi value was increased.

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“…The stability of singular and twin tunnels has been studied in different kinds of soils [14][15][16][17][18] or rock masses [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of GSI and mi on the Stability of 3D Twin Tunnel in Limestone

Zenah,

Görög

2024

Period. Polytech. Civil Eng.

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A Comprehensive Comparison and Analysis of In-Situ Dynamic and Static Tests of a Cased Drilled Shaft

Tomac¹

2022

DFIJ

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This paper analyzes the undrained bearing capacity of temporary cased drilled shaft foundations installed as part of a new tower in Zagreb, Croatia. The comprehensive analysis focuses on skin friction resistance factors using in-situ static and dynamic test loading tests, a finite-difference computational model, and multiple semi-empirical bearing capacity equations. The cased drilled shafts support a 19-story tower on a layered deposit of soft, normally consolidated clay overlying stiff, normally to slightly overconsolidated Zagreb clays. Furthermore, the finite-difference simulations complement the dynamic testing to better understand the spatial and temporal evolution of the load transfer mechanism between the cased drilled shafts and adjacent soils during testing. Although many large-diameter piles have already been installed in Zagreb for buildings or bridge support, the skin friction resistance factors have not been fully understood in local clays, while full-scale in-situ testing has rarely been disseminated to a broader public. Therefore, the presented study will help guide future designs for cased drilled shafts in clays and contribute to global databases. In addition to exhibiting satisfactory bearing capacity in the tests performed as part of this study, the foundation raft system and the tower’s superstructure performed well during the 2020 Zagreb Mw5.3 and 2020 Petrinja Mw6.4 earthquakes.

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Assessment Principles for the Mechanical Behavior of Clay Soils

Alamanis

Lokkas

Chrysanidis

et al. 2021

Wseas Transactions on Applied and Theoretical Mechanics

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The factors that determine the geotechnical behavior of soils are mainly their composition, the size of their grains and their moisture content. The design of a soil structure or foundation project must ensure the shear adequacy of the soil in all phases of construction and throughout the life of the project. However, the shear strength, in general, of the soil is not "constant" but depends on key external factors such as the prehistory of loads, the time and succession of load states, the overpressure of the pore water as well as other factors such as relative density, or any preload, the pressure field, the rate of change of the intensive state, etc. The influence of the deformations as well as the change of the intensive state during the sampling should not be ignored. Unlike other materials, in clay materials the determination of shear strength and its interpretation is a very complex problem. The aim of this article is to search for the mechanical behavior of clay soils (lignite, kaolinite, marl) as shown by the laboratory illustration related with the problems on shear strength of materials, based on the results of experimental research

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Ground settlement induced by tunnel boring in stiff clay

Cited by 3 publications

References 3 publications

The Effect of GSI and mi on the Stability of 3D Twin Tunnel in Limestone

The Effect of GSI and mi on the Stability of 3D Twin Tunnel in Limestone

A Comprehensive Comparison and Analysis of In-Situ Dynamic and Static Tests of a Cased Drilled Shaft

Assessment Principles for the Mechanical Behavior of Clay Soils

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