Lec10 - University of California Berkeley Civil Engineering...

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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 10 9/27/07 Homework 2 Problem 3 Active = Event < 15,000 years Weathering o Physical Disintegration Physical breakdown, no chemical change Natural zones of weakness Unloading Thermal stress Frost wedging Biological activity o Chemical Decomposition Chemical Transformations Formation of new Materials Oxidation Hydration Cation exchange Dissolution by inorganic or organic acids Rain water + Carbonic Acid + Feldspar = Kaolinite Clay Chemical Weathering o Granite Quartz weathers slower than the feldspar and biotite Weakens the bond strengths o Pyroxene weathers down to hemantite Red oxidized soil Hemantite is the end product of the weathering Physical Weathering o Horizontal Bedding and Vertical Dry Cracking and water will break apart a rock Water Pressure Frost wedging Water freezes between cracks and expands o Bioturbation
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This note was uploaded on 04/02/2008 for the course CE 70 taught by Professor Johnson during the Fall '07 term at Berkeley.

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Lec10 - University of California Berkeley Civil Engineering...

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