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An experimental study on hydraulic fracture grouting of fissured Ankara clay
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Date
2003
Author
Tunçdemir, Fatih
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In this study, hydraulic fracture grouting (compensation grouting) of fissured Ankara clay with low viscosity cement - bentonite mixes was investigated. For this purpose, undisturbed specimens of fissured Ankara Clay were taken from a cut in a construction pit by means of steel molds of 14 cm diameter and 20 cm height. The injection was carried out horizontally at the mid height of the specimen via a cylindrical injection pipe with specially designed slots on it. As a grout material cement and bentonite mixes were used at different water/cement ratios. Two different surcharges, namely 100 kPa in the first part of the study and 40 kPa in the second part, were applied on the specimen before the grouting operation was performed. The purpose was to observe the response of the specimen to the grouting at different pressure levels and the effects of the water/cement ratio and surcharging loads on the fracturing pressure, the volume change versus time behavior, and the amount of heave observed. It has been observed that as the grout material becomes more viscous (as the water/cement ratio decreases) the fracturing pressure increases and the amount of heaving induced on the specimen becomes less. It has also been seen that the volume of grout taken up by the specimen until fracturing occurs decreases as the water/cement ratio increases.
Subject Keywords
Grouting
,
Fracture grouting
,
Compensation grouting
,
Model study
,
Water/cement ratio
URI
https://hdl.handle.net/11511/13121
Collections
Graduate School of Natural and Applied Sciences, Thesis
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F. Tunçdemir, “An experimental study on hydraulic fracture grouting of fissured Ankara clay,” M.S. - Master of Science, Middle East Technical University, 2003.
