Rock destruction by tension.

The article describes a procedure proposed for solving inverse problems on identification of flat specimen fracture by tension using in situ displacements and acoustic emission. Weak associated area with concentration of pores is modeled by a mathematical cut with lengthwise averaged normal tensile stresses. In places with high concentration of pores, Young's modulus is 'degraded,' i.e. strains arise here and cause shear stresses. The latter are calculated by successive approximations of solutions of direct problems by specimen contour displacements and data on acoustic emission. In principle, under consideration are inverse problems of the continuum mechanics. [ABSTRACT FROM AUTHOR]