Numerical Modelling Study of Behaviour of Consolidated Strata Around Tunnel
Journal Title: STAR Journal - Year 2014, Vol 3, Issue 2
Abstract
Tunnelling in densely populated areas and under existing buildings is common in most of the cities around the world. Upon excavation there are changes that take place in the soil /rock mass and these changes can have an impact on the surface structures. In this paper an attempt is made to assess the behavior of the tunnel in given environment and the associated displacements due to tunneling in a highly consolidated soil/rock mass with two different conditions of earth pressure coefficient. A case study of a tunnel in South India was taken up for studies. 3-dimensional Distinct Element Modelling code was used for the analysis. In the first stage, earth pressure coefficient Ko of 2.2 was taken for the top layers and 1.8 for bottom layers. In the second stage, a value of 2.2 was considered throughout the model. In the third stage displacement generated in the transverse direction, in the presence and absence of the building load was taken into consideration and analysed. Vertical displacements were found to be of considerable magnitude at the crown, showing a decreasing trend towards the surface. Horizontal displacements were of negligible magnitude along the depth. However, maximum displacement was noted at the springing level of the tunnel. Models incorporating weight of buildings showed no noticeable increase in the settlements, as the soil/rock mass is already consolidated.
Authors and Affiliations
Nalini Rebello| Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, India, Vedala Rama Sastry| Department of Mining Engineering, National Institute of Technology Karnataka, Surathkal, India, Shivashankar R| Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, India
Integration of Family Planning Services within Post Abortion Care at Health Facilities in Dessie –North East Ethiopia
The aim of this study is to investigate the integration of family planning services within post abortion care that plays a vital role in reducing maternal morbidity and mortality resulting from abortion and its complic...
Evaluations of Different Montage Types and Sizes on Eri and Mulberry Feeding Silkworms Cocoon Yield and Quality of Silk, at Melkassa Agricultural Research Center, East Shoa, Ethiopia
No Abstract
Antiradical and Antimicrobial Activityof Atylosia lineata Wt. andArn
No Abstract
Radical Scavenging, Antimicrobial and Insecticidal Efficacy of Parmotrema cristiferum and Dirinaria applanata
Lichens are self-supporting symbiotic association of mycobiont and photobiont. The present study was conducted to investigate antimicrobial, insecticidal and radical scavenging potential of methanol extract of two macrol...
Formulation, Development and Evaluation of Colon-specific Ketorolac Tromethamine Compression Coated Tablets
No Abstract