Abstract
Pawinihan Landslide in 2006 is a landslide that occurred in breccia material that has weathered. So this study will discuss the influence of weathering to form sliding surface. Weathering is as a result of a natural process because of the atmosphere and hydrosphere condition. These changes will affect the decrease of the rock strength. This study will focus on the influence of physical and chemical weathering to landslide. The method used is the British Standard BS EN ISO 14689-1 to differentiate levels of weathering, and then perform a sampling of the physical, mechanical, and chemical weathering on different levels. Furthermore there will be a study of slope stability by differentiating layers of weathering level. The results obtained are sliding surface at a weathering rate of 3 in accordance with conditions on the ground, but it rather shift up to conditions on the ground.
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