Numerical analysis of surface subsidence in asymmetric parallel highway tunnels

Das, Ratan; Singh, Pankaj; Kainthola, Ashutosh; Panthee, Suman; Singh, T. N.

doi:10.1016/j.jrmge.2016.11.009

Cited by 82 publications

(15 citation statements)

References 37 publications

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“…domain discretization, local approximation, global matrix assembly, and solution. The problem domain is discretized into a finite number of subdomains called "finite elements" having a particular shape and fixed number of nodes [39].…”

Section: Numerical Modellingmentioning

confidence: 99%

Analysis and prediction of brittle failure in rock blocks having a circular tunnel under uniaxial compression using acoustic Emission technique: laboratory testing and numerical simulation

2021

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In this research, the failure mechanism and anomalous behavior of intact and jointed rock block having a circular tunnel under compression are studied. This was done by monitoring the progressive failure of a rock tunnel subjected to uniaxial loading. The tests were conducted in sandstone blocks and “Acoustic Emission” (AE) technique was used to identify the crack damage and other failure attributes. Three cases have been considered in the research, i.e. tunnel in the intact rock, with horizontal joints, and with vertical joint sets. Images of progressive failure, acoustic signals, and applied loads were simultaneously recorded during the test. The intact block demonstrates continuous crack generation while the block with horizontal joint set shows a stepwise cracking pattern. In the third case where the vertical joints were employed, the deformation was largely roof failure and joint perpendicular extension was dominant. The AE events show that a sudden drop and then a quiet period of seismic “Ib value” could be considered as the precursors to forecast the rockburst hazard. The paper also compares the results of the physical model test with a 2D finite element model. The compared results show good agreement between the physical and numerical models.

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Section: Numerical Modellingmentioning

confidence: 99%

Analysis and prediction of brittle failure in rock blocks having a circular tunnel under uniaxial compression using acoustic Emission technique: laboratory testing and numerical simulation

2021

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“…Numerical method, empirical formula, and analytical modeling are commonly used to predict the ground responses due to the shallow‐buried twin tunnel construction. The numerical method is mainly used in detailed tunnel design, with the consideration on complex geological conditions, as well as the interaction between the tunnels and existing structures . Although the numerical methods are extremely helpful, it requires a long running time, especially when complete parametric analyses need to be performed.…”

Section: Introductionmentioning

confidence: 99%

Analytical stress and displacement due to twin tunneling in an elastic semi‐infinite ground subjected to surcharge loads

Wang

Jiang

et al. 2018

Num Anal Meth Geomechanics

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The construction of twin tunnels at shallow depth has become increasingly common in urban areas. In general, twin tunnels are usually near each other, in which the interaction between tunnels is too significant to be ignored on their stability. The equivalent arbitrarily distributed loads imposed on ground surface were considered in this study, and a new analytical approach was provided to efficiently predict the elastic stresses and displacements around the twin tunnels. The interaction between 2 tunnels of different radii with various arrangements was taken into account in the analysis. We used the Schwartz alternating method in this study to reduce the twin-tunnel problem to a series of problems where only 1 tunnel was contained in half-plane. The convergent and highly accurate analytical solutions were achieved by superposing the solutions of the reduced single-tunnel problems. The analytical solutions were then verified by the good agreement between analytical and numerical results. Furthermore, by the comparison on initial plastic zone and surface settlement between analytical solution and numerical/measured results of elastoplastic cases, it was proven that the analytical solution can accurately predict the initial plastic zone and its propagation direction and can qualitatively provide the reliable ground settlements. A parametric study was finally performed to investigate the influence of locations of surcharge load and the tunnel arrangement on the ground stresses and displacements. The new solution proposed in this study provides an insight into the interaction of shallow twin tunnels under surcharge loads, and it can be used as an alternative approach for the preliminary design of future shallow tunnels excavated in rock or medium/stiff clay.

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“…The review on these numerical methods is done by Negro and De Queiroz [23], Jing [24] and Barla [25] in detail. Recently, Elarabi and Mustafa [18], Kanik et al [21],Yang et al [26] Maji and Adugna [27] Das et al [28] Vlachopoulos et al [29] and Abdolkader et al [30] utilized different numerical codes for underground excavations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Verification of Empirically Designed Support for a Headrace Tunnel

et al. 2018

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In this paper, we used two empirical rock classification systems of rock mass rating (RMR) and rock quality tunnelling index (Q-system) for the support design of a tunnel in District Battagram, Khyber Pakhtunkhwa, Pakistan. Along the tunnel route, the rocks of Precambrian namely Gandaf Formation, Karora Formation and Besham Complex were exposed. During the field investigations, two shear zones were marked in the schist of Karora Formation. The discontinuities parameters collected during the field investigations, results of laboratory testing and material constants determined from RocData version 5.0 software were used during the empirical classification and numerical modelling. The support was designed for the rock mass units from RMR and Q. The quantification of the thickness of plastic zone and total displacement around the tunnel were achieved by the numerical modelling of RS2 9.0 software in both unsupported and supported conditions. The empirically designed support was installed in the model prepared in the RS2 software. According to the results, the empirically designed support when installed in models prepared in RS2 significantly reduced the plastic zone around the tunnel. The reduction in the plastic zone and displacement around the tunnel verified the support design by empirical methods. The present research concludes that empirical designed support can be used for the complex geology of Pakistan.

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Numerical analysis of surface subsidence in asymmetric parallel highway tunnels

Cited by 82 publications

References 37 publications

Analysis and prediction of brittle failure in rock blocks having a circular tunnel under uniaxial compression using acoustic Emission technique: laboratory testing and numerical simulation

Analysis and prediction of brittle failure in rock blocks having a circular tunnel under uniaxial compression using acoustic Emission technique: laboratory testing and numerical simulation

Analytical stress and displacement due to twin tunneling in an elastic semi‐infinite ground subjected to surcharge loads

Numerical Verification of Empirically Designed Support for a Headrace Tunnel

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