Comparison of Permeability and Groutability of Ostur Dam Site Rock Mass for Grout Curtain Design

Sadeghiyeh, S. M.; Hashemi, Mahmoud; Ajalloeian, Rassoul

doi:10.1007/s00603-012-0282-6

Cited by 41 publications

(20 citation statements)

References 6 publications

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“…In this regard, Ewert (1997) believes that this difference can be explained by the fact that within joints in which water can easily flow grout cannot move, so that the hydraulic failure induced by the grouting pressure results in washout of particles inside the joint. Sadeghiyeh et al (2013) compared the cement take values with the Lugeon numbers in Ostur dam site and find a general consistency; however they also observed somewhat opposing trends especially where more pressure used for grouting compared to the water pressure test. Generally the crack system and crack apertures are relatively unknown (Fransson 2001) and considering such uncertainties, it is difficult to predict the grouting result and attempts to do this are seldom performed with a more theoretical approach.…”

Section: Introductionmentioning

confidence: 85%

Estimation of the grout take using empirical relationships (case study: Bakhtiari dam site)

Sohrabi-Bidar

Rastegarnia

Zolfaghari³

2015

Bull Eng Geol Environ

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Seepage in the foundation and abutments of a dam can lead to wasting of the stored water in the reservoir, erosion of the foundation materials and increasing the uplift pressure. It can endanger the long term stability of the dam. Cement grouting is one of the seepage control methods which is generally implemented according to the Lugeon test results. In this study, the grout volume has been examined against Q-value, Lugeon number, SPI (Secondary permeability index) value and joint apertures in the Bakhtiari dam site. In Bakhtiari dam site, the left and the right abutment trial grouting boreholes were drilled up to the final depth of 60 and 100 m, respectively. Limestone of the Sarvak Formation is the dominant rock type in the site. The Q-system parameters have been evaluated by eyeexamination of rock cores, the Lugeon numbers and SPI values have been deduced from the water pressure tests and the joint apertures have been calculated based on the permeability of rock mass and the joints spacing. The Q-value, the Lugeon number, the SPI value and the joint aperture have been compared with measured cement take and grout take in the trial grouting boreholes. A general correlation exists, especially when the mentioned parameters have been compared with normalized grout take. Against these general agreements the coefficients of determination for the fitted relations are low or moderate, and it seems that more research has been needed to assessing a reliable predictive relation for the grout and cement takes.

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Section: Introductionmentioning

confidence: 85%

Estimation of the grout take using empirical relationships (case study: Bakhtiari dam site)

Sohrabi-Bidar

Rastegarnia

Zolfaghari³

2015

Bull Eng Geol Environ

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“…Gt and average values of RQD, Q, GSI, JSP, Ap, Lu, and SPI were correlated with simple regression analyses. Equations (4)- (11) are the derived empirical equations from simple regression analyses (Table 10). Figure 12 shows the graphs of simple regression analyses results.…”

Section: Simple and Multiple Regression Analysesmentioning

confidence: 99%

“…When the VAF value is closer to 100% or equal, prediction performance of empirical equation is accepted as perfect. Equations (4)- (11) are derived with simple regression analyses. Considering the VAF and RMSE values, the prediction performance of empirical equations, Equation (10) shows the best performance.…”

Section: Simple and Multiple Regression Analysesmentioning

confidence: 99%

“…Azimian and Ajolleian [10] described relationships between Lugeon and secondary permeability index in Nargesi and Cheshmeh-Assheg dam sites and suggested an empirical equation for correlation secondary permeability index (SPI) and Lugeon methods. Sadeghiyeh et al [11] compared permeability and groutability of the Ostur dam site rock mass for a grout curtain site. Investigators correlated secondary permeability index, rock quality designation, and cement take at the dam site and suggested that the areas with diverging trends required no treatment and that those with converging trends required heavy treatment.…”

Section: Introductionmentioning

confidence: 99%

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An Assessment on Permeability and Grout Take of Limestone: A Case Study at Mut Dam, Karaman, Turkey

Kayabaşı

Gökçeoğlu

2019

Water

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The main purposes of the present study are to evaluate pilot grouting and to develop regression equations for prediction of grout intake. There are no permeability problems with the sandstone-siltstone-claystone alternations and basement clayey limestone at the dam site. Karstic limestone block is permeable due to karstification and heavy discontinuities. For the purpose of the study, Q system, geological strength index (GSI), secondary permeability index (SPI), joint spacing (JSP), joint apertures (Ap), Lugeon (Lu), and the permeability coefficient (k) were determined. Karstic limestone block rock mass properties correlated with grouting material amount. A series of simple and multiple nonlinear regression analyses was performed between grout take material amount (Gt) and average values of these rock mass properties. Significant determination coefficients were determined. Prediction capacity of the empirical equations were also examined with root mean square error (RMSE), values account for (VAF), mean absolute percentage error (MAPE), and prediction error evaluations. Considering simple regression analyses, the equation derived with Gt-SPI gives the best performance. The best prediction is determined with the equation derived with rock quality designation values (RQD), SPI, and joint aperture as input parameters with the multiple nonlinear regression analysis, in addition to this, other empirical equations also provide acceptable results.

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“…The sealing of dam foundations and abutments requires considering the geological conditions of the rock masses in question, including lithology, rock strength, hydrothermal veins as primary discontinuities, main joint sets as secondary discontinuities, distribution of the discontinuities, quality and strength of the joint-filling material and their permeability conditions (Sadeghiyeh et al 2012). The decision to construct a grout curtain depends largely on the results of water pressure tests (WPTs), as introduced by Lugeon (Ewert 1997c).…”

Section: Introductionmentioning

confidence: 99%

Permeability and groutability appraisal of the Nargesi dam site in Iran based on the secondary permeability index, joint hydraulic aperture and Lugeon tests

Azimian

Ajalloeian

2014

Bull Eng Geol Environ

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Seepage from the body and foundations of dams is one of the most important design parameters highly influenced by permeability. Also, permeability is one of the basic parameters for designing grout curtains, preventing water from escaping from the foundation and avoiding negative seepage pressures in borrow materials used for grouting. In this work, rock mass classification of a rock foundation dam site was carried out using the rock mass rating (RMR) and geological strength index (GSI) systems. This study was mainly conducted to evaluate permeability and groutability at the Nargesi dam site in Iran using secondary permeability index (SPI), joint hydraulic aperture (JHA) and Lugeon tests. Also, the dam foundation was evaluated by pressure tests (WPTs) that indicated the need for a grout curtain below the dam foundation. The rock mass quality of the samples obtained via the SPI in conjunction with the drill core jointing degree acts as a useful reference for ground treatment design. The dam foundation groutability was zoned according to an SPI classification point view. There is no direct relationship between the JHA values and water take in all the sections, but a direct relation is observed in some boreholes. Such a relationship can be attributed to joint characteristics such as persistence, etc. The results of this work revealed, except for a few cases, there is a reasonable correlation between secondary permeability index (SPI) and rock quality designation (RQD) values. Based on these results, a grout type and composition was suggested for construction of the grout curtain.Keywords Rock mass classification Á Permeability and groutability Á Nargesi dam site Á Water pressure tests (WPTs) Á Secondary permeability index (SPI) Á Joint hydraulic aperture (JHA)

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Comparison of Permeability and Groutability of Ostur Dam Site Rock Mass for Grout Curtain Design

Cited by 41 publications

References 6 publications

Estimation of the grout take using empirical relationships (case study: Bakhtiari dam site)

Estimation of the grout take using empirical relationships (case study: Bakhtiari dam site)

An Assessment on Permeability and Grout Take of Limestone: A Case Study at Mut Dam, Karaman, Turkey

Permeability and groutability appraisal of the Nargesi dam site in Iran based on the secondary permeability index, joint hydraulic aperture and Lugeon tests

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