Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Engineering Aspects of Jet Grouting and Its Applications for Seepage Control
Akhila Manne, Sr. Geotechnical Engineer, P. V. S. R. Prasad, Geotechnical Manager and Madan Kumar Annam, Head of Engineering
Jet grouting technique is applied for modifying the existing ground or to construct load bearing member or a barrier without prior excavation. The jet grouting process employs hydraulic-induced mixing of cement slurry with the native soil and is commonly used for providing seepage control, limiting subsidence over tunnel excavation sites, and underpinning existing structures threatened by subsidence etc. In specific to seepage control, the structural barriers resulting due to jet grouting in the in-situ soil help increase the imperviousness of the in-situ soil and acts as a barrier to water flow. Achieving the required diameter, strength, permeability etc. of the jet grout barrier depends on jet grouting parameters such as grout pressure, lifting speed, number and diameter of nozzles and grout mix. In addition to the operating parameters, column geometry, depth of treatment, effective quality control plan plays important role in achieving a reliable seepage control barrier. This paper discusses the engineering aspects of jet grouting in specific to address seepage control application of in-situ soil. The technological process, construction parameters and construction method for formation of impervious wall for seepage control are discussed in detail along with case history of one of the multipurpose irrigation project in India.
|article #3171; publication #1050 (India2018)|