. Mass soil movements in the Andrews Experimental Forest. Earth movements Oregon; Soil mechanics Oregon. 2. Road backslope failure. This is a common event, which frequently results in road blockage (fig. 3). The failure most often takes the form of a slump, but the slump material may have some earthflow characteristics near the toe. The most failure-prone back- slopes were those constructed in areas of deep, well-weathered tuffs and breccias. These saprolitic materials fail easily when exces- sively moist. If failures did occur in areas of andesiteor basaltparent material, invariably the
. Mass soil movements in the Andrews Experimental Forest. Earth movements Oregon; Soil mechanics Oregon. 2. Road backslope failure. This is a common event, which frequently results in road blockage (fig. 3). The failure most often takes the form of a slump, but the slump material may have some earthflow characteristics near the toe. The most failure-prone back- slopes were those constructed in areas of deep, well-weathered tuffs and breccias. These saprolitic materials fail easily when exces- sively moist. If failures did occur in areas of andesiteor basaltparent material, invariably the local bed- rock was highly fractured. Like the majority of other mass move- ment events, backslope slumps occur only when the mantle is satu- rated and are also more common in areas where mass movement has occurred repeatedly in the Figure failure in an arec of soil derived from andesite col luvium. Figure failure in tha H. J. Andrews Experimental Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dyrness, C. T. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). [Portland, Or. ] : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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