International Journal of Civil Engineering

en Application of cement grouting for stabilization of coarse materials Soil Mechanics Classic Soil Mechanics Classic Technical Note Technical Note In a rare engineering experience throughout the world, we successfully stabilized relatively coarse materials of drain using cement grouting. The grouting work was performed at the Karkheh earth dam, southwest Iran, and was part of the efforts to extend the dam’s cut-off wall. Since the dam was completed, the execution of the new cut-off wall from the dam crest was inevitable. Hence, one of the main difficulties associated with the development of the new cut-off wall was trenching and execution of plastic-concrete wall through the relatively coarse materials of drain in the dam body. Due to high permeability of drain, the work was associated with the possible risk of excessive slurry loss which could result in the collapse of the trench. In order to achieve an appropriate grouting plan and to determine the mix ratio for the grouting material, a full-scale test platform consisting of actual drain materials was constructed and underwent various tests. Results of the testing program revealed that a grouting plan with at least 2 grouting rows and a Water/Cement mix ratio of 1/ (1.5-2) can successfully stabilize the drain materials. After finalizing the technical characteristics of the grouting work, the method was applied on the drain materials of the Karkheh dam body. The results were satisfactory and the drain materials were stabilized successfully so that the cut-off wall was executed without any technical problem. Grouting, Cement grouting, Karkheh dam, Coarse material, Drain, Slurry loss, Cut off wall 71 77 http://ijce.iust.ac.ir/browse.php?a_code=A-10-1023-1&slc_lang=en&sid=1 M. Heidarzadeh m.heidarzadeh@modares.ac.ir 180031947532846009879 180031947532846009879 Yes Assistant Professor, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran A.A. Mirghasemi 180031947532846009880 180031947532846009880 No Professor, School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran S. M. Sadr Lahijani 180031947532846009881 180031947532846009881 No Senior Geotechnical Engineer, Mahab Ghodss Consulting Engineers, Tehran, Iran F. Eslamian 180031947532846009882 180031947532846009882 No Senior Geotechnical Engineer, Mahab Ghodss Consulting Engineers, Tehran, Iran