GEOL 106 Lecture Notes - Quick Clay, Avalanche

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In rocks, potential failure planes are planes of weakness (also knows as discontinuities. W = weight of potential failure black: the larger w is the lower the s,f is. Example a ) increase in slope of pit wall decreases the sf. Example b) loading weight on a slope will decrease the sf. Example c) weight = volume x density x gravity: during an earthquake, the gravity value can be locally. Release of pressure when buried rocks are brought to earth"s surface during weathering and erosion. Shrinking of igneous rocks as they cool following crystallization changed. The effect of a change in weight on sf is not very great. Even a big increase in weight only causes a small decrease in sf. But if you are already near failure a weight increase might push you over the edge . Sensitive clay ( quick clay: changes strength dramatically when vibrated by earthquakes or heavy machinery or during slip, it liquefies.

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