It has been well known that the stability of slopes in the open pit coal mines in Indonesia does not remain constant over long periods of time. This has been mainly attributed to the weathering process that intensively occurs in the tropical regions. It is therefore appropriate to carry out a research of shear strength characteristics on rock samples of the predominant coal bearing strata such as sandstone which are obtained from Tutupan coal mines in South Kalimantan, Indonesia. The research includes the shear creep test with Generalized Kelvin model rheology approach with 15 × 15 cm and 25 × 25 cm sandstone samples size respectively. The research reveals that the long term strength of that sandstone is significantly lower than their peak strengths. It is also found that the Generalized Kelvin rheology model does fit to the rheology of these rock samples.

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