Abstract
The laboratory modeling of unsteady deformation at interface of a faulting zone, aimed at studying movement over rigid surfaces with an in-between interlayer of pre-stressed granular medium now exposed to trigger destressing, has shown that the relationship of the force drop and displacement of rigid boundaries under the trigger destressing is linear. The slope of straight lines characterizes the resultant rigidity of the system and depends on the set of the input parameters: the spring simulating elasticity of fault surfaces; the granular medium simulating the faulting contact friction; the short-term friction drop trigger. It is found that soft loading takes much energy and results in lower force drop but higher displacements under destressing. The author illustrates that the destressing of the granular medium in the pre-set limit state is accompanied with displacement discontinuities at the rigid boundaries and partial drop of shearing force.
Published Version
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