نتایج جستجو برای: circular hole rock sample and flac3d
تعداد نتایج: 16885456 فیلتر نتایج به سال:
To address the prominent status of great deformation and difficult maintenance roadway under high stresses, this study investigated mechanical characteristics surrounding rocks bearing structural stability in a adjustment redistribution stresses through theoretical analysis, numerical simulation, engineering field test. Stability forms structure were analyzed by using axis-changing theory from ...
The effect of gravitational radiation reaction on circular orbits around a spinning (Kerr) black hole is computed to leading order in S (the magnitude of the spin angular momentum of the hole) and in the strength of gravity M/r (where M is the mass of the black hole, r is the orbital radius, and G = c = 1). The radiation reaction makes the orbit shrink but leaves it circular, and drives the orb...
In order to study the optimal coal pillar width and surrounding rock control mechanism of gob-side entry under inclined seam condition, 130205 return air adjacent 130203 gob in Yangchangwan No. 1 well is taken as a typical engineering background. By means background analysis, theoretical analysis based on inside outside stress field, numerical simulation by FLAC3D software, situ industrial test...
this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...
We calculate a generalized polarizability and susceptibility of a circular hole in a thick metallic plate as a function of hole dimensions and wavelength. In particular, we construct a variational form which allows us to obtain accurate numerical results with a minimum of computational effort. Numerical results are obtained for a variety of hole dimensions relative to the wavelength. In additio...
the skill of reading in english as a foreign language is an important and challenging one which is affected both by linguistic and extra linguistic factors. since vocabularies are part and parcel of every reading comprehension text, knowing enough vocabulary always facilitates this process. however, guessing strategy as one of the most important strategies has consistently ignored by language l...
in new management approaches, in the organizations with inflexible structure, existing of red tapes and interruptions caused by limitations and also non-compliance with environmental changes, create demotivation among staff. with regard to the influence of job motivational potential and its relationship to the type of organizational structure( enabling and dissuasive), the goal of this research...
abstract recent studies suggest that prelistening activities play an important role in the development of listening comprehension (e.g. long 1990;chiang and dunkel 1992; schmidt-rinehart 1994; jensen and hansen 1995; robinson et al., 1995; buck, 1995; foster and skehan,1996; teng 1996; robinson, 2001; chang and read 2006). in line with previous studies and to shed light on a new aspect of sche...
A hole is a chordless cycle with at least four vertices. A pan is a graph which consists of a hole and a single vertex with precisely one neighbor on the hole. An even hole is a hole with an even number of vertices. We prove that a (pan, even hole)-free graph can be decomposed by clique cutsets into essentially unit circular-arc graphs. This structure theorem is the basis of our O(nm)-time cert...
To study the stress distribution characteristics of surrounding rock and spalling mechanism deep hard tunnels with different arch heights, complex variable function angle-preserving transformation method in elasticity theory were applied to analytic solution tangential during adjustment. In addition, true triaxial tests conducted on granite cube specimens (100 mm × 100 mm) containing holes thre...
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