نتایج جستجو برای: rock mass

تعداد نتایج: 511463  

Journal: :REM - International Engineering Journal 2021

The rock mass deformation modulus, Erm, is an input parameter for most numerical modeling to verify the behavior of rocks due engineering activities within/on it. Among common methodologies used estimating this parameter, empirical correlations based on classification schemes (e.g., RQD, RMR, GSI, and Q) stand out most, principally because their low cost when compared other methods. Herein, mai...

2010
Brian A. Clarke Douglas W. Burbank

a r t i c l e i n f o Keywords: bedrock fractures threshold slopes landslides landscape evolution erosion Bedrock fracturing and rock strength are widely believed to influence landscape morphology and erosional resistance. Yet, understanding of the quantitative relationship between rock-mass strength and landscape evolution remains limited. Here we present a new application of seismic refractio...

Journal: :international journal of transportation engineereing 2015
mohammad reza maleki javan fouad kilanehei amir mahjoob

rock slope stability depends very much on the strength features of the rock and the geometrical and strength characteristics of the discontinuities (e.g., roughness, wall strength and persistence). since a rock mass is not a continuum, its behavior is dominated by such discontinuities as faults, joints and bedding planes. also, rock slope instability is a major hazard for human activities and o...

Journal: :Arteriosclerosis, thrombosis, and vascular biology 2011
Junko Soga Kensuke Noma Takaki Hata Takayuki Hidaka Yuichi Fujii Naomi Idei Noritaka Fujimura Shinsuke Mikami Tatsuya Maruhashi Yasuki Kihara Kazuaki Chayama Hitoshi Kato James K Liao Yukihito Higashi

OBJECTIVE Cardiovascular diseases are associated with chronic activation of Rho-associated kinases (ROCKs) and endothelial dysfunction. Both increased ROCK activity and endothelial dysfunction are thought to be closely associated with conventional cardiovascular risk factors. The purpose of this study was to determine the relationships between ROCK activity, endothelial function, and cardiovasc...

Journal: :نشریه دانشکده فنی 0
مهدی موسوی دانشگاه تهران علیرضا یاراحمدی بافقی دانشگاه تهران حمیدرضا بخشی دانشگاه تهران

in the past, rock slope stability analysis were performed either graphically or using a hand-held calculator, but nowadays there are variety of slope stability analysis which can be used according to the field condition and potential failure mode. in 2-d analysis, effect of convex and concave walls are neglected, however concave slopes are believed to be more stable than straight walls due to t...

2014
Qunyi Liu Wanli Xing Ying Li

The joint surface is widely distributed in the rock, thus leading to the nonlinear characteristics of rock mass strength and limiting the effectiveness of the linear model in reflecting characteristics. The JRC/JCS model is the nonlinear failure criterion and generally believed to describe the characteristics of joints better than other models. In order to develop the numerical program for JRC/...

Journal: :Canadian Journal of Communication 1993

2015
Masoud Zare Naghadehi

Natural rock joints infilled with soil materials may show a reduced shear strength, which influences rock mass stability. The aim of this paper is to experimentally investigate the shear behaviour of infilled rock joints, taking into account joint surface characteristics and the properties of the joint and infill materials. A new model for predicting the shear strength of infilled joints is pre...

Journal: :Geophysical Research Letters 2012

2003

Transient heat andor fluid mass exchange between the permeable fracture system and the surrounding relatively impermeable country rock can be treated in geothermal reservoir simulators using the “MINC” technique. This approach typically requires about an order of magnitude more computer time than the analogous “porous medium” problem. Under practical conditions, the problem can often be lineari...

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