ANALISIS KESTABILAN LERENG JALAN TAMBANG DI PT. SUMBAR CALCIUM PRATAMA JORONG ATAS HALABAN, NAGARI HALABAN, KECAMATAN LAREH SAGO HALABAN, KABUPATEN LIMA PULUH KOTA, PROVINSI SUMATERA BARAT

Abstract

mining area. Planning of the slope geometry will be used by Bishop Simplified and Hoek and Bray methods.
Initial data Clay: Unit Wight (γ) = 19.67 kN / m3, Cohesion (c ') = 32.17 kN/ m2 and internal angle (φ') = 39.11 °. The initial slope height is 14.543 meters and overall angle of the slope is 51 °.
Geometry of slope recommendation: 1. Bishop Simplified method of saturated condition FK 0.984 witch mean slope is insecurity, reduction of slope angle from 51 ° to 42 °, FK 1,324 slope in safe state. 2. Method Hoek and Bray saturated conditions FK 1.25 Unsafe slope, slope angle from 51 ° to 42 °, then FK 1.41 slope in safe condition.

Keywords: initial geometry, bishop simplified, hoek and bray, security factor