Analysis and Design Approach for Large Storage Caverns

Mandal, A.; Chakravarthy, C. P.; Nanda, A.; Rath, R.; Usmani, A.

doi:10.1061/(asce)gm.1943-5622.0000180

Cited by 15 publications

(4 citation statements)

References 2 publications

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“…Contemporary geoenvironmental engineering and practices deal with design and construction of several thermo-active structures such as furnaces, boiler units, forging units, brick kilns and rocket launching pads, buried conduits and electrical cables, air conditioning ducts (Kadali et al 2013), disposal facilities of waste from the nuclear and thermal power plants (Rao and Singh 1999;Krishnaiah and Singh 2004;Delage et al 2010;Dao et al 2015), underground crude oil storage tanks (Mandal et al 2013;Padmakumar 2013;Usmani et al 2015), oil carrying pipelines ( Brandon and Mitchell 1989;Abuel-Naga et al 2008;Lee et al 2010;Manthena and Singh 2001), solar ponds (Velmurugan and Srithar 2008), energy geostructures ( Knellwolf et al 2011;Loveridge and Powrie 2013;Salciarini et al 2013;Yavari et al 2014;Di Donna et al 2016;Faizal et al 2016;McCartney et al 2016), which result in conveyance of thermal energy through the soil mass. Moreover, activities like dissociation of gas hydrates by heating (Feng et al 2015;Song et al 2015Song et al , 2016 and exploitation of oil sand by steam assisted gravity drainage (SAGD) (Elsayed et al 2015;Lazzaroni et al 2016) and also soil-atmosphere interaction ( Heusinkveld et al 2004;Ochsner et al 2007;Cui et al 2013) involve heat migration through soil mass.…”

Section: Introductionmentioning

confidence: 99%

A finite difference model for undefined end boundary to analyse the heat transfer in dry sands

Mondal

Singh

Tang³

et al. 2020

International Journal of Geotechnical Engineering

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Accurate prediction of thermal regime (i.e., the variation of soil temperature, θ, and heat flux,  ) to investigate the migration of thermal energy in soil mass, poses challenge to the geoenvironmental engineers while dealing with various thermo-active structures. In this context, several numerical approaches have been attempted to solve the heat transfer equation (HTE) for conduction to predict the thermal regime. However, most of them need accurate boundary condition defined and involve complicated numerical approach which is inconvenient for the practising engineers. Hence, an attempt has been made in the present study to develop a simplified, but numerically efficient, approach based on the finite difference method (FDM) to analyse one dimensional heat transfer in dry sands when the end boundary is not defined. Furthermore, a time dependent initial boundary condition has been applied to this model to simulate similar experimental condition and results have been compared vis-à-vis those obtained from the experiment and COMSOL Multiphysics ® to validate the proposed approach.

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Section: Introductionmentioning

confidence: 99%

A finite difference model for undefined end boundary to analyse the heat transfer in dry sands

Mondal

Singh

Tang³

et al. 2020

International Journal of Geotechnical Engineering

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“…Excavation of cavern was carried out in different stages (Fig. 1) to reduce the unsupported span thus to increased the stability of excavation (Mandal et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Archives of Mining Sciences

Bhatkar

Usmani

Mandal

et al. 2018

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This article presents a case study of a large wedge failure. It took place during excavation of the last bench of storage cavern with an approximate dimension of 80 m long having a depth of 8 m. The adopted intervention followed a structured approach, which included immediate rock support, geotechnical and geological investigations in the failure zone and design modifications. Back analyses of the failure zone were also carried out to assess design parameters with observed geological conditions. Re assessment in the failure zone was carried out using modified design parameters, which included shorter benches, rock support installation schemes such as longer rock bolts, reinforced ribs of shotcrete and reduced construction advances. Geotechnical monitoring in and around failure zone were carried out for recording any alarming movements in the rock mass. Initially, geotechnical monitoring was carried out in the recently excavated zone of the cavern on a daily basis. Based on continuous monitoring data for at least one week, the frequency of subsequent monitoring can be decided. In most cases the deformation of rock mass was considerably less than the alarming values which were calculated based on detailed design for different rock classes. The paper discusses the failure, investigation, cause, assessment and remedial measures to complete the construction of cavern.

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“…Continuous numerical approaches, such as finite difference method (FDM) (Narasimhan and Witherspoon, 1976), finite element method (FEM) (Koyama et al, 2009) and Boundary Element Method (BEM) (Mohanty and Vandergrift, 2012) have been extensively applied for stability analysis for underground storage caverns to deal with continuum-based problems (e.g. Preece and Foley, 1983;Lu, 1998;Heusermann et al, 2003;Mandal et al, 2013;Wang et al, 2015b). Discontinuous methods, for instance, discrete element method (DEM) (Cundall, 1971;Cundall and Strack, 1979), and discontinuous deformation analysis (DDA) (Shi, 1988), are useful to analyze discontinuities of rock masses (e.g.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Stability analysis of underground oil storage caverns by an integrated numerical and microseismic monitoring approach

Tang

Wang

et al. 2016

Tunnelling and Underground Space Technology

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a b s t r a c tUnderground storage in unlined caverns is of great significance for storing energy resources. Construction of underground storage caverns is an extremely complex process, involving extensive multi-bench excavation and strong unloading. Excavation-induced damage of surrounding rock masses may lead to instability of underground storage caverns. The aim of this paper is to put forward a method by integrating numerical simulation and microseismic monitoring for evaluation of cavern stability. A novel numerical method called Continuous-Discontinuous Element Method (CDEM) is applied to simulate micro-cracks under excavation-induced unloading conditions. Meanwhile, a microseismic (MS) monitoring system is employed to monitor real-time MS events during construction of storage caverns. Numerical results are validated using the monitoring data from the MS monitoring system. The integrated method is proved to be successful in capturing micro-cracks in underground storage caverns. Local instability, potential unstable zones and micro-crack evolution are analyzed, and cracking mechanisms are also discussed.

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Analysis and Design Approach for Large Storage Caverns

Cited by 15 publications

References 2 publications

A finite difference model for undefined end boundary to analyse the heat transfer in dry sands

A finite difference model for undefined end boundary to analyse the heat transfer in dry sands

Archives of Mining Sciences

Stability analysis of underground oil storage caverns by an integrated numerical and microseismic monitoring approach

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