ABSTRAKTujuan penyelidikan geofisika ini adalah memprediksi kejenuhan airtanah pada batuan di areal rencana penelitian pilot plant Underground Coal Gasification berdasarkan metode tahanan jenis. Kejenuhan tersebut diinterpretasikan berdasarkan distribusi tahanan jenis (ρ) batuan di bawah permukaan tanah. Data kejenuhan airtanah pada batuan sangat diperlukan dalam operasional gasifikasi batubara bawah tanah, terutama yang berkaitan dengan proses pembakaran lapisan batubara dan gasifikasinya. Dari hasil pemrosesan data dapat diinterpretasikan bahwa hampir seluruh batuan di bawah permukaan di area rencana penelitian memperlihatkan kondisi jenuh dengan airtanah sampai kedalaman 300 meter, yang ditandai dengan nilai ρ<100 Ωm. Kondisi ini merupakan hal yang memerlukan perhatian serius,terutama pada proses pembakaran dan gasifikasi yang lapisan batubaranya terletak di kedalaman 250-300 meter dari permukaan. Nilai ρ>100 Ωm hanya dijumpai pada lintasan tertentu dan pada kedalaman relatif dangkal. Oleh karena itu, sangat disarankan melakukan uji pompa untuk mengetahui potensi akuifer secara kuantitatif. Penyelidikan ini memberikan peringatan dini kemungkinan adanya zona jenuh airtanah yang akan berpengaruh pada proses gasifikasi.Kata kunci: geolistrik, tahanan jenis, kejenuhan airtanah pada batuan, pembakaran, gasifikasi lapisan batubara. ABSTRACT The purpose of this geophysical study is to predict the groundwater saturation of rocks in the area of research plans for Underground Coal Gasification pilot plant with geoelectric resistivity method. The saturation is interpreted by the distribution of resistivity (ρ) rocks in the subsurface
Slope stability analysis is one of the important issues in open-pit mining. It is directly influences mining operation and cost. It also becomes a primary need to prevent slope failures that disturbing production activity. Failures in slope are controlled by factors such as slope dimension, geological structures, physical and mechanical properties of slope material, and the external forces acting on the slope. This paper presents the study results on the prediction of slope stability analysis by using kinematic analysis. The study was conducted to predict the potential slope failures that could occur at the selected mine site. The site was chosen on one of the locations of open pit coal mining PT. X in East Kalimantan. Some observation points are determined to show types of failure that can occur, such as plane and wedge failure. The results show that the potential failure of the planar type occurs in 8 locations while the wedge failure occurs in 7 locations. The potential failure occur in 5 observation points, i.e: Pit-1/OP-1, Pit-2/OP-1, Pit-3/OP-1, Pit-5/OP-1, Pit-5/OP-3. Other points are in stable condition because the plane’s direction is opposite the slope direction.
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