MODELLING OF INJECTION OF FINE CEMENT GROUT : DISCRETE APPROACH

Abstract eng:
Injection aims to improve the soil characteristics through consolidation and/or sealing. This paper presents a new groutability criterion dedicated to select the adequate size of cement to be injected in a given sand sample. It also deals with a numerical modeling of the injection by the Distinct Element Method, which represents an innovation in the matter. In fact, most of the numerical grouting models consider soil and grout as continuum media. However, as most of the grouts are of suspension type, the continuous approach generally presents difficulties by taking into account the particle retention witch presents the main reason of an injection failure. The new numerical model represents each soil and cement grain separately so that the void matrix of the sample as well as cement grains blocking in front of small passages are well taken into account. The injection process is expressed through drag forces applied by the suspension fluid on cement particles. The comparison of numerical results with experimental ones showed that the numerical discreet approach of grouting is quiet interesting.

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