Damages in composite matelials are mostly governed by interfacial debonding. In order to tale this into account, we employ an analytical model considering partial debonding along interface, and formulate a finite element. The model utilizes a concept where a moduli of an inclusion is replaced by an equivalent one of debonded inclusions. Through some ezamples, usefulness of the model is shown. As an application excavation analysis of a tunnel in jointed rock mass is carried out, and the results are compared with other observations.

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