Empirical Study of Behavior of Clay Shale Slopes. Volume 2. Appendixes.

摘要

The study was undertaken to determine the factors that lead to instability in clay shale to provide a basis for assessing the probable long-term stability of high crater slopes in clay shales. The chief features contributing to the engineering behavior of clay shales are degree of overconsolidation and lithology,both of which reflect geologic history. Local geologic structure and hydrologic conditions affect individual slopes. Weak layers may present slope hazards,while conversely a few stronger layers may materially strengthen an entire clay shale slope. Time-dependent phenomena are important in clay shale slopes,which may fail after standing apparently stable for many years. Intensive studies were conducted of natural slopes in five clay shale units in the upper Missouri Basin.