Developing a Slope Stability Curve of Open Pit Coal Mine by Using Dimensional Analysis Method

• Main Authors: Kramadibrata, S., Saptono, S., Wattimena, R.K., Simangunsong, G.M., Sulistianto, B.
• Format: Conference Proceeding
• Language: English
• Published: ISRM 2011; International Society for Rock Mechanics and Rock Engineering
• ISBN: 0415804442; 9780415804448

Most of the coal bearing strata in Indonesia is dominated by weak and friable to medium strong sandstone and in many mine sites experience high rainfall. Factor of strength deterioration of the coal bearing strata is obvious and geotechnical engineers have been taking account this factor into the slope stability calculation. The potential of slope failure is controlled by the dimension and geometry of the slope, orientation of the discontinuity and its shear strength properties. Thus, a geotechnical research which can link the rock mass characteristics with the shear strength of discontinuity plane was carried out. The research coverage includes determination the most potential slope failure areas embracing of not less than 20 cross sections stretches along 14 km long with the maximum height of slope section was 190 m, geological structure mapping, determination of physical and mechanical properties of intact rock and for determination the shear strength properties were based various sample sizes from 54mm to 1000 mm. In order to develop a slope stability curve (Hoek & Bray, 1981), dimensional functions associated with slope stability assessment were derived. It is however important to note that at present the validation process of this curve has not yet been done.