Under uniaxial loading, the heterogeneity of rock mass, change mechanical properties joints, and progressive fracture process mass significantly affect size effect anisotropy columnar jointed basalts (CJBs). To reveal features failure mechanisms CJBs influenced by anisotropy, digital image correlation (DIC), meso-damage mechanics, statistical strength theory, continuum mechanics were combined (...

To understand the fracture features of zonal disintegration and reveal failure mechanisms circle tunnels excavated in deep jointed rock masses, a series three-dimensional heterogeneous models considering varying joint dip angles are established. The strength reduction method is embedded RFPA to achieve gradual process, macro mode safety factor, reproduce characteristic phenomenon i.e., disinteg...

The purpose of this study was to investigate the effect of modifying aluminum oxide slips with magnesium oxide (MgO) to create a jointing material for In-Ceram Alumina. Jointed In-Ceram Alumina bars with In-Ceram Alumina slips containing 0-1.0 mass% MgO were examined by a three-point bending test. Joint-free bars were also tested as controls. Fracture surfaces were evaluated by scanning electro...

Underground longwall mining of coal causes large scale disturbance of the surrounding rock mass. The disturbance can increase the rock mass permeability through a reduction on the stress as well as formation of new fractures in the rock. Methane gas contained in the disturbed rock mass can migrate towards the low pressure mine workings and present an explosion hazard. This paper describes the a...

Under the condition of constant external stress, displacement and stress joint will be adjusted continuously with time, resulting in creep phenomenon, that is, continuous increase strain which further causes damage jointed rock mass. In order to study size effect shear rheological mechanical properties, this paper conducted numerical simulations on nonpenetrating penetrating models established ...