Soma-Eynez Fayının Düşen Bloğunda (670-Topuğu) Yeralan Bir Açık Ocak Kömür Madenindeki Gözlenen Devrilme Yenilmelerinin İncelenmesi

Abstract

670 pillar is a geological barrier that will trap the rock blocks falling and rolling from the deformation zone of the Eynez fault as well as to prevent the materials belonging to the landslides to be formed along the fault zone from reaching the coal production area. It forms the foot wall of Soma-Eynez fault and consists of Neogene aged marls. The toppling failures observed in the 670-pillar ́s slopes threatened the safety of excavation works for coal production in the open pit. The maximum runout distances of rock fragments that had toppled, fallen and rolled at different slope heights as a result of the mentioned mass movements were determined using computer softwares. The project excavation limit for the open pit coal mine was determined by considering the runout distances calculated for different slope heights. In this work, toppling failures observed in the 670-pillar ́s slopes were investigated both Soma-Eynez Fayının Düşen Bloğunda (670-Topuğu) Yeralan Bir Açık Ocak Kömür Madenindeki Gözlenen Devrilme Yenilmelerinin İncelenmesi Investigation of Toppling Failures in an Open Pit Coal Mine Located in the Foot Wall of Eynez Fault-Soma (670-Pillar) Batuhan TERLİ1 , Enes KALHAN1 , M. Yalçın KOCA2* 1 Dokuz Eylül Üniversitesi, Fen Bilimleri Enstitüsü, Uygulamalı Jeoloji Anabilim Dalı, 35160, İzmir 2 Dokuz Eylül Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, 35160, İzmir Geliş (Received): 17 Eylül (September) 2020 / Düzeltme (Revised): 09 Şubat (February) 2021 / Kabul (Accepted): 04 Mart (March) 2021 Terli, Kalhan, Koca Soma-Eynez Fayının Düşen Bloğunda (670-Topuğu) Yeralan Bir Açık Ocak Kömür Madenindeki Gözlenen Devrilme Yenilmelerinin İncelenmesi 84 kinematically and numerically, using stereographic projection and different computer softwares, respectively. Safety factors obtained from different softwares for the same slope geometries were compared and the effect of friction angle (ɸ) and cohesion (c) values of the joint surfaces on safety factor that cause toppling failures were investigated. In addition, the time-dependent changes of joint aperture increase rate obtained from 20-deformation measurement points installed on the cracks causing toppling failures were investigated. The areas where the joint aperture increase rate is highest and the areas where the toppling failure is observed in the pillar ́s slope were associated.