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Shepherd's Bush Station Case History of Detailed Design and Pre-Injection Trial for Soil Consolidation by Ultrafine Cement Grout
Shepherd's Bush Station is one of 13 existing stations currently being upgraded by London Underground to meet future passenger demand. Ground consolidation within the Terrace Gravels was specified in order to provide the equivalent of 5 m of clay cover to back-hoe tunnels to be excavated at shallow depth in an area having either minimal clay cover, or with the tunnel crown breaking through into highly permeable sands and gravels. Because of the safety issues associated with tunnelling crews working in potentially unstable ground conditions, and the potential effect of shallow tunnelling on surface infrastructure and utilities, the performance of the ground treatment was critical. A comprehensive laboratory injection testing programme was carried out in cylinders of re-compacted soil samples using a cementitious grout with limestone rock flour filler, followed by the execution of a full-scale field trial in order to establish the relative performance of a traditional split-spacing sequence of injections, compared to a progressive displacement approach. CAD modelling was utilised throughout because of the very complex geometry, and all injections were carried out by computerised grout station for automatic piloting of injections. On completion of the field trial the treated ground was exposed in-situ to verify the continuity of treatment. The paper will detail both the laboratory and site test procedures, the injection methodology and grout mix, and provide an evaluation of the results obtained by post-injection core drilling and water testing of the treated ground.
Shepherd's Bush Station Case History of Detailed Design and Pre-Injection Trial for Soil Consolidation by Ultrafine Cement Grout
Shepherd's Bush Station is one of 13 existing stations currently being upgraded by London Underground to meet future passenger demand. Ground consolidation within the Terrace Gravels was specified in order to provide the equivalent of 5 m of clay cover to back-hoe tunnels to be excavated at shallow depth in an area having either minimal clay cover, or with the tunnel crown breaking through into highly permeable sands and gravels. Because of the safety issues associated with tunnelling crews working in potentially unstable ground conditions, and the potential effect of shallow tunnelling on surface infrastructure and utilities, the performance of the ground treatment was critical. A comprehensive laboratory injection testing programme was carried out in cylinders of re-compacted soil samples using a cementitious grout with limestone rock flour filler, followed by the execution of a full-scale field trial in order to establish the relative performance of a traditional split-spacing sequence of injections, compared to a progressive displacement approach. CAD modelling was utilised throughout because of the very complex geometry, and all injections were carried out by computerised grout station for automatic piloting of injections. On completion of the field trial the treated ground was exposed in-situ to verify the continuity of treatment. The paper will detail both the laboratory and site test procedures, the injection methodology and grout mix, and provide an evaluation of the results obtained by post-injection core drilling and water testing of the treated ground.
Shepherd's Bush Station Case History of Detailed Design and Pre-Injection Trial for Soil Consolidation by Ultrafine Cement Grout
Kettle, Clif (author) / Totty, Richard (author) / Vrba, Vojtech (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 937-962
2012-08-17
Conference paper
Electronic Resource
English
Piles , Mixing , Grouting , Highways and roads , United Kingdom , Chemical grouting , Anchors , Cement , Case studies , Foundations , Cutoffs , Hydraulic structures
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