Community Research and Development Information Service - CORDIS

Modelling of grouting

Modelling of compensation grouting operations is necessary to make an efficient design of compensation work, where decisions are needed for grout spacing, injection volume and injection rate. A conceptual model of grouting operation within the framework of tunnel construction analysis was developed in order to upscale the local injection phenomenon to global tunnel-soil interaction problem. In this model, a concept of grout efficiency has been introduced and the method of its numerical implementation into a finite element/difference code has been proposed. Both numerical and laboratory investigations were conducted to validate the proposed conceptual model of compensation grouting. Particular attention was made to estimate grout efficiency from the soil condition (e.g. soil, type, overconsolidation ratio). Grout injection tests were performed in the laboratory on reconstituted and natural clays to investigate the long-term effect of compensation grouting in clays. Using the proposed model, three-dimensional finite element analysis was performed to simulate compensation grouting operation performed in Tokyo and good agreement between the calculated values to the measured data was found.

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