Classification of rocks for rock mechanics

Coates, D F

doi:10.1016/0148-9062(64)90008-7

Cited by 46 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…a rock may be classified as BY BH, BL, et cetera. The strength classification is similar to the one given by Coates (1964), shown as Table 2.2 in this report, except that five cate ories of strength are proposed rather than three. The proposed Class E -Vary Low Strength, for compressive strengths less than 4,000 psi, corresponds approximately to Coates' Weak Category (less than 5,000 psi).…”

Section: Proposeid Etngineer Ing Classif!cuatiovsupporting

confidence: 53%

“…The same rock should have the same classification regardless of how it is being used (Coates, 1964).…”

Section: Classification By In-situ Character Of Rock Massmentioning

confidence: 99%

“…Coates (1964) reviews the uses to be made of rock mechanics in engineering work, and lists five characteristics or properties which he considers to be most important for engineering applications.…”

Section: T Er Of Rock Katerialsmentioning

confidence: 99%

“…For the engineer, the appropriate classification of both the rock materials and rock mass would greatly assist in making the initial appraisal of the project, and in pointing to the areas where additional engineering information must be cbtained for use in arriving at the final solution to the problem (Coates, 1964).…”

Section: Generalmentioning

confidence: 99%

See 3 more Smart Citations

Engineering Classification and Index Properties for Intact Rock

Deere¹,

Miller²

1966

745

264

View full text Add to dashboard Cite

Physical and elastic properties of NX-size rock core from 27 localities were Investigated in order to develop an engineering classification system for intact rock, and also to develop index proertiec related to important physical and engincerino charocteristics.Thirteen rick types are represented.Lnlcrawury tests were conducted on these rocks as follows: urni, weight, Shore scleroscope hardness, Schmidt hammer hardness, abrasion hardness, absorption, sonic-velocity stress-strain under cyclic loading to 5,000 psi. uniaxial stress-strain t-) failure, and point-load tensile strength. A total of 257 specimens with L/D ratios of 2:1 wee tetcd. Statistical studies were conducted with the Il 7094 computer to determine correlation and regression relationships for selected pairs of variables. A system of engineering classification is proposed in which rocks are classified on the basis of their strength and modulus properties either obtained directly from laboratory tests, or approximately from index properties recommended herein. Application of the proposed engineering classification system to data obtained by others is shown by individual charts for each of several different rock types.Five charts are presented for estimating the strength or modulus properties for intact rock from toe numerical indices obtained by either the Schmidt hamneri Lie Shore sclerosccpe, or the sonic pulse velocity, all used in conjunction with the unit weight of the rock.

show abstract

Section: Proposeid Etngineer Ing Classif!cuatiovsupporting

confidence: 53%

“…The same rock should have the same classification regardless of how it is being used (Coates, 1964).…”

Section: Classification By In-situ Character Of Rock Massmentioning

confidence: 99%

Section: T Er Of Rock Katerialsmentioning

confidence: 99%

Section: Generalmentioning

confidence: 99%

See 2 more Smart Citations

Engineering Classification and Index Properties for Intact Rock

Deere¹,

Miller²

1966

745

264

View full text Add to dashboard Cite

show abstract

“…A number of workers have established systems that attempt to standardize and quantify descriptions of rock material and rock masses ('Thrzaghi, 1946;Deere, 1963;Coates, 1964;Deere and others, 1967;Barton and others, 1974;Bieniawski, 1974). Information used by these systems to rank the rock include number, spacing and orientation of discontinuities,.…”

Section: Engineering Rock-classification Systemsmentioning

confidence: 99%

Core index, a numerical core-logging procedure for estimating rock quality

Ege¹

1987

Circular

View full text Add to dashboard Cite

Microstructural Evolution of Porosity and Stress During the Formation of Brittle Shear Fractures: A Discrete Element Model Study

2018

View full text Add to dashboard Cite

Brittle fracturing in rocks is a progressive process involving changes in stress, strain, and porosity. Changes in these properties occur heterogeneously within a rock and are manifest at the grain scale, which is difficult to observe directly in the laboratory or the field. This study uses the discrete element method to show that fractures correspond to zones of generally lower stresses, higher porosity, and highly localized dilation and distortional strain. Using the discrete element method, we conducted numerical biaxial experiments at different confining pressures to probe the internal conditions of a low cohesive sandy sediment numerical analog. When compression begins, the stresses within the sandy sediment are relatively homogeneous with anastomosing stress chains. At yield stress, when the confining pressure is relatively low, multiple dilational bands start to open. At peak stress, high‐magnitude stress chains localize adjacent to the developing shear band and distortion is evident. Postpeak stress, through‐going shear fractures are fully developed. High stresses are transmitted across the fracture where porosity is low through a network of particles in contact. With increasing confining pressure, distortion is favored over dilation during deformation. Also, the number of particles that define the width of a stress chain across a shear fracture, and the steepness of the fracture, increases. Our results can be applied to understanding stress conditions of field samples, and in constraining rock property changes during reservoir modeling of fractured reservoirs.

show abstract

Classification of rocks for rock mechanics

Cited by 46 publications

References 2 publications

Engineering Classification and Index Properties for Intact Rock

Engineering Classification and Index Properties for Intact Rock

Core index, a numerical core-logging procedure for estimating rock quality

Microstructural Evolution of Porosity and Stress During the Formation of Brittle Shear Fractures: A Discrete Element Model Study

Contact Info

Product

Resources

About