Dip slope

Dip slope

A dip slope refers to the sloping part of the ground where high shear force affects the stream part and is often covered with thick colluvial soil. It is prone to sliding after heavy rain and can be triggered by water pressures, especially where the upper base plane contains a low-conductivity infilling and water is dammed behind this surface.From: Landslides and Engineered Slopes. From the Past to the Future, Two Volumes + CD-ROM [2019], Forest roads: regional perspectives from around the world [2023], Rock Slope Engineering [2017]

Plane failure

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Published in Duncan C. Wyllie, Rock Slope Engineering, 2017

Duncan C. Wyllie

Dip slope failures can be triggered by water pressures, particularly where the upper base plane contains a low-conductivity infilling and water is dammed behind this surface. For these conditions, the installation of drain holes through the plane would be effective. Ground motions due to earthquakes may also trigger instability; however experience at Telegraph Hill in San Francisco shows that water pressures are a more common cause of instability; no significant slope failures occurred in either the 1906 or 1989 (Loma Prieta) earthquakes (Wallace and Marcum, 2015).

Forest roads: regional perspectives from around the world

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Published in International Journal of Forest Engineering, 2023

C Kevin Lyons, Stelian Alexandru Borz, Campbell Harvey, Muedanyi Ramantswana, Hideo Sakai, Rien Visser

The dip slopes are generally gentle (Suzuki 2000); however, the rock layers being parallel to the slope results in increased frequency of landslides and the collapse of road cut slopes. Road cut slope failures require higher maintenance costs. A dip slope is often covered with thick colluvial soil, and such accumulated soil is prone to slide after heavy rain. For an opposite slope, the bedding angle of the rock layers is opposite to the direction of the slope resulting in broken topography with a reduced frequency of landslides. A road planned on an opposite slope is winding in short sections, with more stable cut slopes.

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Plane failure

Forest roads: regional perspectives from around the world