An experimental study on hydraulic fracture grouting of fissured Ankara clay

Tunçdemir, Fatih
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.


BATIGüN, AYSEGüL; Tosun, İsmail (Informa UK Limited, 1987-11)
A rigorous washing theory is developed using the area averaging technique for unsaturated filter cakes. Limiting cases of the resulting equations are investigated. The assumptions used in the modelling are verified. The mass transfer parameters, which are evaluated by the application of the moment analysis, are shown to be directly proportional with the volumetric flow rate of the wash liquor. Experimental results also indicate that, for a given wash liquor volumetric flow rate, the increase in the cake ...
A laboratory study of fracture grouting technique in sand
Tunçdemir, Fatih; Ergun, Mehmet Ufuk; Department of Civil Engineering (2008)
In this study, fracture grouting technique of saturated, granular soils of different fine content were investigated. Model tests were carried out by using fluid particulate grouts namely micro fine cement and ordinary portland cement grouts. Basically, relationships were obtained between soil conditions (grain size distribution, relative density, overburden stress) and grouting parameters (type of grout, grouting pressure, amount of injected grout, rheological properties of the grout or water/solids ratio)....
An investigation of polymerflooding in limestone reservoirs with a bottom water zone
Bağcı, Ali Suat; Hodaie, H (Informa UK Limited, 2003-03-01)
The effects of polymers on waterflooding of a limestone reservoir with or without a bottom water zone, as well as the effect of vertical and horizontal production wells on oil recovery, have been investigated in laboratory models. Sixteen core flood displacement tests were conducted to study the effect of relative oil-water layer thickness, polymer slug size, and well configuration in a production port. A qualitative comparison was made to show the difference between waterflooding and polymer-augmented wate...
Extension of the chemical index model for estimating Alkali-Silica reaction mitigation efficiency to slags and natural pozzolans
Mahyar, Mandi; Erdoğan, Sinan Turhan; Tokyay, Mustafa (2018-08-10)
Supplementary cementitious materials (SCMs) can mitigate alkali silica reaction (ASR) but the level of cement replacement required is difficult to estimate for a particular SCM. The Chemical Index Model was recently proposed to estimate the relation between mortar expansion and the chemical compositions of cement and fly ash but has not been tested extensively for use with other SCMs. This study uses natural pozzolans and blast furnace slags, in addition to fly ashes, with two portland cements and a reactiv...
A Study on Tensile Strength of Compacted Fine-Grained Soils
Dagar, Volkan; Çokça, Erdal (Springer Science and Business Media LLC, 2020-08-01)
The tensile strength of clay is a major mechanical parameter and the main controlling parameter of tensile crack development which is generally encountered in geostructures. In this experimental study, 8-shaped direct tensile test and split tensile test were used to measure the tensile strength of compacted clay soil. Unconfined compression tests on the same clay samples were also carried out. Tensile strength and unconfined compression test results were compared. Laboratory tests were performed on Ankara c...
Citation Formats
F. Tunçdemir, “An experimental study on hydraulic fracture grouting of fissured Ankara clay,” M.S. - Master of Science, Middle East Technical University, 2003.