Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Prediction of Ground Conditions Ahead of an Advancing Tunnel Face by Quantification of Vector Orientation
Observation and Measurement of displacements at the crown of the tunnel is an integral part of New Austrian Tunneling Method (NATM) in complex rock masses to verify the construction parameters, support systems and safety requirements. However, the prediction of ground conditions ahead of an advancing tunnel face is also an application, often less explored in the field by site engineers. Literature suggests displacement vector orientation is a good indicator of weak ground or fault/shear zones ahead of the tunnel face. There has been no quantification between the vector orientation and the properties of the weaker ground ahead. An attempt is made to quantify the effect of the properties of the weaker ground on the vector orientation numerically. The model results are initially compared with analytical solutions, followed by benchmarking with the results of other researchers. The factors which affect the vector orientation are the diameter of the tunnel, stiffness ratio of the rocks and in situ stress ratio. The effect of each of these parameters is studied independently. A correlation between the vector orientation and the variation in ground conditions is then established to predict the properties of the weaker ground ahead of the advancing tunnel face.
Prediction of Ground Conditions Ahead of an Advancing Tunnel Face by Quantification of Vector Orientation
Observation and Measurement of displacements at the crown of the tunnel is an integral part of New Austrian Tunneling Method (NATM) in complex rock masses to verify the construction parameters, support systems and safety requirements. However, the prediction of ground conditions ahead of an advancing tunnel face is also an application, often less explored in the field by site engineers. Literature suggests displacement vector orientation is a good indicator of weak ground or fault/shear zones ahead of the tunnel face. There has been no quantification between the vector orientation and the properties of the weaker ground ahead. An attempt is made to quantify the effect of the properties of the weaker ground on the vector orientation numerically. The model results are initially compared with analytical solutions, followed by benchmarking with the results of other researchers. The factors which affect the vector orientation are the diameter of the tunnel, stiffness ratio of the rocks and in situ stress ratio. The effect of each of these parameters is studied independently. A correlation between the vector orientation and the variation in ground conditions is then established to predict the properties of the weaker ground ahead of the advancing tunnel face.
Prediction of Ground Conditions Ahead of an Advancing Tunnel Face by Quantification of Vector Orientation
Goswami, N. (Autor:in) / Sharma, K. G. (Autor:in)
Geo-Shanghai 2014 ; 2014 ; Shanghai, China
Tunneling and Underground Construction ; 216-226
05.05.2014
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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