PROPAGATION CHARACTERISTICS OF SURFACE AND IN-DEPTH VIBRATIONS IN SAND GROUNDS: A COMPARATIVE ANALYSIS

Abstract

This paper aims to investigate the propagation characteristics of blast-induced ground vibrations in loose dry sand under surface and underground vibration conditions by monitoring the particle velocities and dominant frequencies of artificially generated ground vibrations. For this purpose, a ball drop apparatus was used to generate surface and underground vibrations at different depths. The free fall of the ball induced ground vibrations by impact. A total of 60 laboratory-scale ground vibration monitoring tests were performed on 4 physical models placed in a tank designed for this study. The vibrations were monitored on the surface of the sand filling the tank. The obtained results demonstrated that surface vibrations resulted in higher particle velocities than those generated by underground vibrations and that particle velocities measured on the ground surface decreased as the depth of the underground vibration source increased. The frequency analysis emphasized that only low frequencies (<40 Hz) were generated by surface ground vibration monitoring tests whereas 86.67% of those induced by underground vibration monitoring tests were high frequencies (>40 Hz). It was also determined that increasing the depth of the vibration source resulted in decreasing the dominant frequency range within the range of high frequencies (>40 Hz).

Keywords

• Blast-induced ground vibration
• Sand
• PPV
• PVS
• Dominant frequency

Project Number

191009025

Kum Zemin Yüzeyinde ve Derininde Meydana Gelen Titreşimlerin Yayılım Karakteristikleri: Karşılaştırmalı Bir Çalışma

Abstract

Bu makale, gevşek kum zemin yüzeyinde ve derininde meydana gelen patlatma kaynaklı titreşimlerin yayılım karakteristiklerini, patlatma ile birlikte ortaya çıkan baskın frekans ve parçacık hızları gibi parametrelerin takibiyle araştırmayı amaçlamaktadır. Bu amaçla, titreşimlerin simülasyonunu sağlamak için, yüzeyde ve yer altında belirli seviyelerden düşerek buna kaynak oluşturacak bir çelik bilye kullanılmıştır. Bu bilye, serbest düşme aparatı yardımıyla istenilen derinlik seviyesinde zemin titreşim dalgaları oluşturmaktadır. Oluşturulan darbelerin yarattığı titreşim yayılımları, üst yüzeyde belirli noktalara yerleştirilen patlatma sismografı kullanılarak takip edilmiştir. Bu çalışma için tasarlanan bir tank içerisine kurulan 4 fiziksel model üzerinde laboratuvar ölçekli toplam 60 adet yer titreşim izleme testi gerçekleştirilmiştir. Elde edilen sonuçlar irdelendiğinde, yüzeyde oluşturulan darbelerin oluşturduğu titreşimlerinin yarattığı parçacık hızlarının yer altında oluşturulan darbelerin oluşturduğu titreşim değerlerinin yarattığı parçacık hızlarına göre daha yüksek olduğu gözlemlenmiştir. Ayrıca, yer altı titreşim kaynağının derinliğinin artmasıyla, zemin yüzeyinde ölçülen parçacık hızının da azaldığı gözlemlenmiştir. Frekans analizi sonuçları, yüzey zemin titreşim izleme testleri ile yalnızca düşük frekansların (<40 Hz) üretildiğini, yer altı titreşim izleme testlerinin ise% 86.67'sinin yüksek frekanslar (>40 Hz) olduğunu göstermiştir. Son olarak, titreşim kaynağının derinliğinin artmasının, yüksek frekanslar (>40 Hz) aralığında baskın frekans aralığının azalmasına neden olduğu tespit edilmiştir.

Keywords

• Patlatma Kaynaklı Tireşim
• Kum
• PPV
• PVS
• Dominant Frekans

Supporting Institution

Konya Teknik Üniversitesi BAP Koordinatörlüğü

Project Number

191009025

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