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Geomechanics and Engineering
  Volume 13, Number 4, October 2017, pages 685-699

Pressure analysis in grouting and water pressure test to achieving optimal pressure
Hassan Bakhshandeh Amnieh, Majid Masoudi and Reza Kolahchi

    In order to determine the rate of penetrability, water pressure test is used before the grouting. One of the parameters which have the highest effect is pressure. Mathematical modeling is used for the first time in this study to determine the optimum pressure. Thus, the joints that exist in the rock mass are simulated using cylindrical shell model. The joint surroundings are also modeled through Pasternak environment. In order to validate the modeling, pressure values obtained by the model were used in the sites of Seymareh and Aghbolagh dams and the relative error rates were measured considering the differences between calculated and actual pressures recorded in these operations. In water pressure test, in Seymareh dam, the error values were equal to 4.75, 3.93, 4.8 percent and in the Aghbolagh dam, were 22.43, 5.22, 2.6 percent and in grouting operation in Seymareh dam were equal to 9.09, 32.50, 21.98, 5.57, 29.61 percent and in the Aghbolagh dam were 2.96, 5.40, 4.32 percent. Due to differences in rheological properties of water and grout and based on the overall results, modeling in water pressure test is more accurate than grouting and this error in water pressure test is 7.28 percent and in grouting is 13.92 percent.
Key Words
    water pressure test; grouting; hydraulic fracture; mathematical modeling; cylindrical shell model
Hassan Bakhshandeh Amnieh: School of Mining, College of Engineering, University of Tehran, Iran
Majid Masoudi: Department of Mining Engineering, Faculty of Engineering, University of Kashan, Iran
Reza Kolahchi: Department of Civil Engineering, Meymeh Branch, Islamic Azad University, Meymeh, Iran

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