Abstract
The interaction problem among fractures under the action of compressional stress is studied in this paper by using the finite element method and boundary element method respectively. The mechanical criteria which differentiate between the independent fractures and fracture systems and their computation methods are presented in this paper. The proportional conditions between length and spacing of fractures that exist interaction for several kinds of fracture groups of different geometric arrangement are given. The effect of interaction among fractures on the displacement field, stress field and strain energy distribution are computed. The relations between the fracture system of conjugate array and conjugate earthquakes are also discussed in this paper.
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