Stress arching effect during the excavation of broken surrounding rock in underground engineering has an important influence on stability after excavation. To determine stress horizontally layered jointed mass, characteristics mass is analyzed this study by using a series numerical tests. The formation mechanism arch revealed through comparison voussoir beam structure and theoretical analysis m...

The original DDARF (discontinuous deformation analysis for rock failure) can only generate uniform grids, and the increase in number of grids reduces efficiency calculation, which limits use large-scale geotechnical engineering. This is a problem that needs to be solved DDARF. A new method proposed this paper optimize generation DDARF, optimized heterogeneous grids. model Brazilian disc-splitti...

Gene flow between jointed goatgrass and winter wheat is a concern because transfer of herbicide-resistance genes from imidazolinone-resistant (IR) winter wheat cultivars to jointed goatgrass could restrict weed-management options for this serious weed of winter wheat cropping systems. The objectives of this study were (1) to investigate the frequency of interspecific hybridization between IR wh...

Abstract Shear Strength of jointed rock plays a significant role in the stability mass structure especially if developments plan to be constructed adjacent this formation. However, get shear strength joints is quite costly and difficult identified directly at site. This research conducted establish relationship between uniaxial compressive (UCS) granitic rock. UCS parameters are easily common p...

An efficient and systematic methodology for the topological synthesis of geared robot manipulators (GRMs) with a jointed unit is developed. The approach is based on the idea that the kinematic structure of a GRM with a jointed unit is composed of an equivalent open-loop chain (EOLC), disjointed mechanical transmission lines (MTLs), and jointed MTLs. It is shown that the jointed MTLs can be deco...