Numerous coal pillars are left after the coal mining process. The composite structure comprising a roof and coal pillar has prominent creep characteristics, which threaten safe underground mining. Therefore, the creep characteristics of coal-rock combina
Structural planes such as joints, fissures, and weak interlayers exist in natural rock masses. The mechanical properties of the structural planes of a rock mass are often the factors controlling the safety of rock mass engineering1,2,3. The total deformation of a structural plane of a rock mas...
Also, an orthotropic constitutive model is developed for the jointed rock mass. Section snippets Literature review on scale effects on strength and deformability, and REV size and its properties Most naturally occurring discontinuous rock masses comprise of intact rock interspaced with different types of...
(a) Mercury Intrusion Porosimetry pore entrance size distribution, (b) N2 adsorption/desorption isotherms, (c) Stress-strain curve at compression of the scaffold before and after crosslinking and (d) Swelling evolution of the scaffold during immersion. Table 1. Physical characterization of the Col...
A Bonded Particle Model for Rock英文电子书.pdf,ARTICLE IN PRESS International Journal of Rock Mechanics Mining Sciences 41 (2004) 1329–1364 /locate/ijrmms Abonded-particle model for rock D.O. Potyondya,,1, P.A. Cundallb a University of Toronto, Departme
Rock damage Constitutive model Damage mechanics Damage function Strain softening Underground openings Damage yield function a b s t r a c t The excavation of underground openings generally causes damage to the rock in the vicin- ity of the openings. The dominant causes of irreversible rock deforma...
(b) Visible bedded joints. In general, the determination of rock mass classification is significant before designing for tunnels. Such classification includes information on the strength of the intact rock material, the spacing, the number and surface properties of structural discontinuities, as well...
1 slide is limestone and pelitic limestone of the third member in the Badong group (T 2 b 3 ) [21]. The materials composing the No. 1 slide are either loose soil and rock debris originated from gray pelitic limestone or dense soil and rock debris originated from gray limestone. Within ...
The judgement matrices of the first-level indicator layer, the second-level indicator layer under surface change, the second-level indicator layer under rock mass structure, the second-level indicator layer under physical properties and the second-level indicator layer under matrix weathering in the ...
Based on the dimensionless criterion and Buckingham 蟺 theorem, the dimension and similarity relation of physical model tests of rock masses under seepage and dynamic coupling are derived. A new type of similar material considering hydraulic and dynamic properties was developed by usi...