Sonlu Farklar Yöntemi Kullanılarak Geçirimsiz Baraj Tabanına Yerleştirilen Palplanş Perdesinin Yerinin Belirlenmesi

Year 2024, Volume: 16 Issue: 1, 356 - 372, 31.01.2024

Barış Kaçak , Ertugrul Ordu , Reşat Mutlu

https://doi.org/10.29137/umagd.1351299

Abstract

Zemindeki su akımlarında, zeminin çıkış bölgesinde akım yönü yerçekimine zıt yönde ise kaynama (boiling) olayı gerçekleşebilir. Kaynama olayını önlemek için akım yolu uzunluğu arttırılır veya kaynama riskinin bulunduğu bölgede ağırlık filtresi kullanılır. Akım yolu uzunluğunun arttırılması geçirimsiz barajlarda barajın memba (giriş) bölümünde geçirimsiz bir tabaka oluşturulması veya baraj altına geçirimsiz palplanş perdesi yapmakla mümkündür. Palplanş Perdesinin geçirimsiz baraj altında inşaası masraflı ve zordur. Bu çalışmada baraj duvarı altındaki Palplanş perdesi barajın memba (giriş) bölgesi ile barajın mansap (çıkış) bölgesi arasındaki çok sayıda konuma yerleştirilmiş ve barajın sızıntı hızının değeri sonlu farklar yöntemi ile analiz edilmiştir. Hidrolik yükün gradyanı alınarak, Düşeydeki sızıntı hızı değeri ve Kaynamaya karşı güvenlik sayıları bulunmuştur. Barajın çıkış bölgesine yerleştirilen palplanş perdesinin Düşey sızıntı hızını en aza indiren ve bundan dolayı Kaynamaya karşı düşey güvenlik sayısını maksimize eden çözüm olduğu görülmüştür.

Keywords

Sızıntı Analizi, Kaynama Olayı, Palplanş Perde, Sonlu Farklar Yöntemi

Determination of the Location of the sheet pile wall Placed within the Impermeable Dam Base Using the Finite Difference Method

Abstract

In water currents within the ground, a boiling event may occur if the flow direction is opposite to gravity in the outlet area of the flow floor. To prevent a boiling event, the length of the flow path is increased or a weight filter is used in the area where there is a risk of boiling. Increasing the length of the current path is possible by creating an impermeable layer in the upstream (inlet) section of the dam or by making an impermeable sheet pile wall under the dam. The construction of the sheet pile wall under an impervious dam is expensive and difficult. In this study, the sheet pile wall under the dam wall was placed in various positions between upstream region and downstream (outlet) region of the dam, and the value of the dam's seepage rate was analyzed by finite difference method. Vertical seepage rate values and safety numbers against vertical boiling have been found by taking the gradient of the hydraulic head. It has been seen that the sheet pile wall placed in the exit zone of the dam is the solution that minimizes the leakage rate, and, therefore, maximizes the vertical safety number against boiling.

Keywords

Seepage analysis, Boiling Phenomenon, Sheet pile wall, Finite Difference Method

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