The Hyperstatic Reaction Method for the Analysis of the Sprayed Concrete Linings Behavior in Tunneling

Oreste, Pierpaolo; Spagnoli, Giovanni; Ramos, Cesar Alejandro Luna; Sebille, Lisa

doi:10.1007/s10706-018-0454-6

Cited by 14 publications

(3 citation statements)

References 21 publications

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“…The β value was assessed by researchers to vary depending on the parameters of the tunnel lining and the surrounding soil. β could be equal to 1 [8][9][10][19][20][21] or 2 [4]. In this study, β = 2 is adopted based on the fitting of the results obtained by using the finite element method Plaxis 2D .…”

Section: The Ground-support Interaction Impactmentioning

confidence: 99%

Behaviour of Square and Rectangular Tunnels Using an Improved Finite Element Method

et al. 2022

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Due to its advantages (fast and accurate calculations), the Hyperstatic Reaction Method (HRM) was used to calculate the internal forces of circular tunnel linings in former works. This paper presents an improved HRM method that is developed to estimate the internal forces induced in square and rectangular tunnel linings. Based on the comparison of the internal forces induced in these linings obtained from the HRM method and the finite element method (FEM), the improved HRM method was validated. An extensive parametric analysis of the tunnel lining and ground parameters was then carried out using both the HRM and FEM. The results indicated a great influence of the lateral earth pressure coefficient K0, and the tunnel lining flexibility ratio F on the internal forces induced. Accordingly, the bending moments M, normal forces N, and shear forces T, induced in the tunnel lining decrease when the flexibility ratio of tunnel lining F increases. The maximum bending moment is observed at the tunnel sides that are perpendicular with the larger principal stress direction.

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Section: The Ground-support Interaction Impactmentioning

confidence: 99%

Behaviour of Square and Rectangular Tunnels Using an Improved Finite Element Method

et al. 2022

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“…The application of additives in jet grouting can be used for instance, to overcome the issue in high-speed ground water, where the treated soils can be flushed and to speed up the curing time. Accelerators and superplasticizers are well known in tunneling engineering, where they are added to the shotcrete [24,25] to decrease w/c ratio, improve rheology and compressive strength. Superplasticizers (abbreviated here as SP) in jet grouting can be used to improve the rheology of the grout and, therefore, the hydrodynamic efficiency of the jet [2], for instance, Gurpesaud et al [26] tested SP in a jet grouting job site with w/c ratio 2:1 dosed up to 1.65% (computed as fraction of the cement weight-CWF), but also to decrease spoil volumes if lower w/c ratios are used.…”

Section: Introductionmentioning

confidence: 99%

Improving the Hydrodynamic Performance of Jet Grouting with Chemical Additives

Spagnoli

Modoni

Arciero

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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Efficiency for jet grouting consists in forming cemented soil columns with the largest diameter and the highest mechanical strength. Experimental evidence supported by analytical models shows the two requirements being often contradictory. In fact, strength proportional to the amount of injected cement per unit column volume and higher values are achieved increasing the cement water ratio of the grout. However, the thicker grout obtained by this measure makes the cutting action of the jet less efficient. The paper proposes a solution based on the use of chemical additives to reduce the viscosity of the cement grout and enhance the penetration capacity of the submerged jet. After reporting the results of a field trial, the theory of submerged jets was recalled from previous studies to explain observation highlighting the role of grout rheological properties. Then, laboratory tests were performed varying the grout composition, namely cement-water ratios and fractions of chemical additive, to explore the effects on the grout viscosity. The effects of grout conditioning on the diameter of columns were finally quantified with predictive relations developed in this study.

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“…In the process of underground excavation, the combined support system consists of steel arch and shotcrete is the primary support structure to close the fracture of rock mass, to maintain its stability, and to mobilize its self-bearing strength (Figure 1) (Bjureland et al, 2019; Carranza-Torres and Diederichs, 2009; Oreste et al, 2018; Song et al, 2019; Vojtasik et al, 2017). However, the steel-concrete bond-slip behavior is generally considered to be one of the decisive factors affecting the failure mechanism of composite structures (Kabir et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Study on support characteristic curve of primary support structures in underground excavation considering bond-slip behavior

Lü

Sun

2020

Advances in Structural Engineering

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Steel reinforced shotcrete lining (SRSL) support is the primary structure to maintain the stability and mobilize the self-bearing capacity of surrounding rock. However, the structural design of SRSL in underground excavation still relies on experience-based method and lack of quantitative mechanical analysis. This paper aims to propose a modified analytical model of support characteristic curve (SCC) that represents the mechanical behavior of SRSL structures in underground construction, through which the interface bond-slip behavior between steel arch and shotcrete layer is taken into consideration. Four-point bending test of SRSL composite beam was carried out to study the bearing mechanism and failure performance. Test results show that the shotcrete-steel interface is prone to slip failure which significantly reduces the overall strength of SRSL. The laboratory test is complemented by non-liner finite element parametric studies considering the bond-slip properties to clarify the design principles and to obtain the flexural stiffness of tunnel primary lining structures. Based on above studies, the simplified formulas for the SCC of SRSL is constructed. The research results provide a theoretical basis for the design and application of SRSL structure in related projects.

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The Hyperstatic Reaction Method for the Analysis of the Sprayed Concrete Linings Behavior in Tunneling

Cited by 14 publications

References 21 publications

Behaviour of Square and Rectangular Tunnels Using an Improved Finite Element Method

Behaviour of Square and Rectangular Tunnels Using an Improved Finite Element Method

Improving the Hydrodynamic Performance of Jet Grouting with Chemical Additives

Study on support characteristic curve of primary support structures in underground excavation considering bond-slip behavior

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