Numerical Modelling of Building Response to Underground Tunneling-A Case Study of Pune Metro (original) (raw)
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IRJET- NUMERICAL MODELLING OF BUILDING RESPONSE TO UNDERGROUND TUNNELING -A CASE STUDY OF PUNE METRO
IRJET, 2020
The advancement in underground construction and use of Tunnel boring machine for construction is deeply studied. The construction of underground tunnel in ground involves potential risk of damage to old age structure and may lead to collapse of structure or tunnel. Thus it is very important to predict the surface settlement before construction to minimize risk of collapse. Numerical modelling by FEM analysis of a building in Pune is studied and settlement of building is compared with in-situ settlement. This also includes the numerical modelling of building response to underground tunneling by FEM analysis w.r.t. various parameters i.e., surface settlement (Ground and building, tilting). Then, a control measures over it were proposed to eliminate this risk, which are verified by using finite element software. This works focus on studying the excavation mechanics behavior of underground tunneling and its influence on the around environment, and these conclusions are useful for providing a basis for ongoing work as well similar project construction in the future.
Numerical Modelling of Building Response to Underground Tunnelling - A Case Study of Chennai Metro
International Journal of Civil Engineering
The advancement in underground construction and use of Tunnel boring machine for construction is deeply studied. The construction of underground tunnel in soft ground involves potential risk of damage to superstructure and may lead to collapse of tunnel. Thus it is very important to predict the surface settlement before construction to minimise risk of collapse. Numerical modelling by FEM analysis of a building named Prema Palace in Chennai, India is studied and settlement of building is compared with in-situ settlement. This also includes the numerical modelling of building response to underground tunnelling by FEM analysis w.r.t. various parameters i.e., surface settlement (Ground and building), tilting
A Review Paper on Numerical Modelling of Building Response to Underground Tunneling
2020
Numerous attempts have been done to predict and subsequently control the tunnelinginduced ground movements due to the fact that the number of tunnels in urban areas is increasing. However, existing methods are faced with some limitations and cannot take into account of all the influential parameters in creating surface settlements. As a result, in many cases, the existing methods are not accurate enough, whereas prediction of the exact amount of the maximum surface settlement and the shape of settlement troughs is important to estimate the potential risk of building damage induced by tunneling. Empirically derived relationships have been mainly developed based on field observations obtained from hand mines or tunnels excavated using open faced shields. Therefore, these methods mainly consider more of geological conditions than tunneling operational parameters. Although these methods provide satisfactory results in determining settlement troughs, they tend to be misleading in estimat...
IRJET- A REVIEW PAPER ON NUMERICAL MODELLING OF BUILDING RESPONSE TO UNDERGROUND TUNNELING
IRJET, 2020
Numerous attempts have been done to predict and subsequently control the tunneling-induced ground movements due to the fact that the number of tunnels in urban areas is increasing. However, existing methods are faced with some limitations and cannot take into account of all the influential parameters in creating surface settlements. As a result, in many cases, the existing methods are not accurate enough, whereas prediction of the exact amount of the maximum surface settlement and the shape of settlement troughs is important to estimate the potential risk of building damage induced by tunneling. Empirically derived relationships have been mainly developed based on field observations obtained from hand mines or tunnels excavated using open faced shields. Therefore, these methods mainly consider more of geological conditions than tunneling operational parameters. Although these methods provide satisfactory results in determining settlement troughs, they tend to be misleading in estimating maximum surface settlement. Analytical methods assume ground as an initially isotropic, incompressible and homogeneous mass. These methods have been only developed for circular tunnels and therefore are inapplicable for noncircular tunnels under invariant geological conditions. Finite element simulation usually obtains the settlement troughs shallower and wider than the field observations (Lee and Rowe
Advanced numerical modelling of multi-storey buildings response to tunnelling
In this study the interaction between the ground and a reinforced-concrete building during tunnelling is investigated by a fully coupled three-dimensional approach using the Finite Element code PLAXIS 3D. The excavation of the Milan underground new line 5 by an earth pressure balance (EPB) machine in granular soils is taken as reference for tunnel characteristics and ground conditions. A number of ideal multi-storey reinforced-concrete buildings with appropriate stiffness and weight is examined, all of them being located in a symmetric position with respect to the tunnel. The analysis is also extended to highlight the stiffening contribution of the infill external panels of the structures, schematised as equivalent cross-bracings, on the transversal and longitudinal settlement profiles. The attention is also focused on the evolving response shown by the building columns, evaluated in terms of normal compression forces, during the excavation process.
Indian Geotechnical Journal, 2019
This paper describes the effect of basement excavation and foundation loading on tunnel in sand. Typical tunnel geometry of Delhi Metro and soil conditions in part of Delhi (Yamuna Sand) are considered for modelling. The construction sequences of tunnel excavations, basement footing with retaining wall and the loading on footing have been numerically simulated using plane strain assumption in PLAXIS 2D. Basement foundation, retaining wall, sheet pile and support struts are modelled simulating the construction sequence that is normally adopted in practice. The soil is assumed as elastic-perfectly plastic material, and its failure is governed by Mohr-Coulomb criterion. The tunnel lining, footing, sheet pile, wall and struts are assumed as linear elastic materials. The loading on the footing is modelled in several stages simulating different numbers of storeys for studying the effect of basement excavation and structure/foundation loading. The results indicate that the response of tunnel lining is significantly affected by various stages of basement excavation and foundation loading. Based on the several response parameters of tunnel lining, it is concluded that the critical distance between the tunnel edge and basement footing is found as 2.5 times the tunnel diameter within which the basement excavation and foundation loading have shown significant influence on tunnel response.
Effect of Superstructure on the Stability of Underground Tunnels
Transportation Infrastructure Geotechnology, 2020
With the rapid development of underground space and the metro system in an urban area, the interaction between superstructures, foundations, and excavations with existing tunnels has been increasing. Hence, to ensure the safety of the tunnel, it is necessary to predict the displacement and stresses in tunnel induced by construction activity in its vicinity. The objective of the present study is to analyse the effect of superstructure construction on the stability of underground metro tunnels. A 2D numerical model has been developed using finite element software OptumG2 to replicate the Delhi Metro Phase 3 tunnel project. An elastoplastic model of the tunnel at a standard depth of 18 m has been analysed. The behaviour of the tunnel at the crown, invert, and springer (spring line) has been reported. The shear force and bending moment developed in tunnel lining has also been observed. The study investigates the stresses and displacement in the surrounding soil. Two parametric studies based on tunnel depth and load position have been studied. The study found that the displacement in tunnel points decreases but the lining forces increase with an increase in tunnel depth. The tunnel became stable with an increase in load eccentricity. It is also found that the maximum displacement of soil is not affected significantly either with the depth of tunnel or with load position. However, the stability of soil around the tunnel increases with an increase in depth of the tunnel and superstructure load eccentricity.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2021
Underground construction in urban areas is a challenging work to carry out and includes a lot of factors to be considered. In varying geological conditions, it becomes very difficult as there are various faults and fracture, so it requires a proper investigation to be done before starting of the project. The aim of this report is to determine the effects of tunneling on existing structures and tunnel surrounding due to tunnelling work, like crack in structure, vibrations caused to the above structure and ground settlement. To identify the movements caused and giving a solution by using the RS2 software and deciding the best suitable method for Construction of tunnel.
Effects on Underground Tunnel with or Without Building at Top in Different Ground Strata
This paper gives the idea of the settlement occurrence at the surface of soil due to tunnelling. The trough formed due to the tunnelling at various depths in Greenfield ground condition is compared with the formation of trough due to the presence of building at the top of tunnel. The tunnel section adopted is a modified horseshoe tunnel section, were this is taken from the Bharbai-Aizawl Railway Project Tunnel No.1. The soil settlement at top of surface is tried to reduce to minimum with the help of varying depths and varying lengths of construction stages. The prediction was that the settlement can be controlled by increase in depth of tunnel, but the experiment done shows the new path to control this formation of troughs. The soil profiles selected are the medium soil & the soft rock. This study has its importance to check the building effect due to the tunnel and what kind of possible damages could occur to existing structure. The building can face the minor-major cracks in the i...