关键词: 对偶边界元素法, 单域边界元素法, 异向性岩石, 裂缝前缘, 应力强度因子, 横向等向性

Abstract:

Numerical technique in rock fracture mechanics have become indispensable tools for solving all kinds of science and engineering problems. Extensive research has been carried out for the development of new numerical methods to determine the stress intensity factors (SIFs). Due to the varied engineering conditions in the practical area, it is imperative to develop new numerical methods or to explore alternative techniques for the purpose of solving the complicated problems and to improve the efficiency and accuracy of the existing or new numerical methods. In recent years, scholars investigate methods of the various tests and focus on the modeI, modeII and mixedmode III. The mode III fracture is still in the initial stage. However, the rock mass often occurs in modeIII fracture under load in underground engineering and slope engineering. Thus, the development of modeIII SIF will help to study the behavior of rock fracture. This thesis presents the dual boundary element methods (dualBEM) or singledomain BEM to analyze anisotropic rocks in modeIII fracture and adopts the FORTRAN language to develop the numerical program. For anisotropic rocks of modeIII fracture, the SIF along the crack front can be discussed. The aim of these discussions are to compare the variation of SIFs (KI, KII and KIII) for different crack length, material width, material inclined angle and the anisotropic influence in transversely isotropic material. Further, the value of KIII can be discussed.

Key words: dual boundary element method, single domain boundary element method, anisotropy rock, crack front, stress intensity factor (SIF), transversely isotropy