Abstract
The functional relationship between various definitions of effective stress, i.e., conventional, Biot-Willis-Nur-Byerlee, and theory of interacting continua (Tinc), is explored both theoretically and experimentally. Stress-strain data on dry and saturated Weber Sandstone demonstrate that the conventional effective stress law grossly overestimates the pore pressure effect; whereas, Biot-Willis-Nur-Byerlee and Tinc laws somewhat underestimate this effect. Failure is examined from a microscopic point of view. It is shown that Tinc-type effective stress laws cannot account for the effect of pore pressure on failure in a simple manner. Failure is one aspect of material response in which the conventional effective stress law is useful. In summary, it appears necessary to have 2 effective stress laws, i.e., one to describe the stress-strain response and a second to delineate the failure surface. (21 refs.)
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