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Rock Mass Rating
The rock mass rating (RMR) is a geomechanics, geomechanical classification system for Rock (geology), rocks, developed by Z. T. Bieniawski between 1972 and 1973. Since then it has undergone multiple modifications out of which, RMR89 is commonly used. Recently RMR14 has been proposed to improve the RMR performance by incorporating new experiences from tunnel practices. Continuous functions and a software "QuickRMR" for RMR89 and RMR14 have also been proposed by Kundu.Kundu, J., Sarkar, K., Singh, A.K., & Singh, T., 2020. Continuous functions and a computer application for rock mass rating. Int. J. Rock Mech. Min. Sci. 129. RMR combines the most significant geologic parameters of influence and represents them with one overall comprehensive index of rock mass quality, which is used for the design and construction of excavations in rock, such as tunnels, mines, slopes, and foundations. Definition The following six parameters are used to classify a rock mass using the RMR system #Uniax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geomechanics
Geomechanics (from the Greek prefix ''geo-'' meaning "earth"; and "mechanics") is the study of the mechanical state of the earth's crust and the processes occurring in it under the influence of natural physical factors. It involves the study of the mechanics of soil and rock. Background The two main disciplines of geomechanics are soil mechanics and rock mechanics. The former deals with the behaviour of soil from a small scale to a landslide scale. The latter deals with issues in geosciences related to rock mass characterization and rock mass mechanics, such as applied to petroleum, mining and civil engineering problems, such as borehole stability, tunnel design, rock breakage, slope stability, foundations, and rock drilling. Many aspects of geomechanics overlap with parts of geotechnical engineering, engineering geology, and geological engineering. Modern developments relate to seismology, continuum mechanics, discontinuum mechanics, and transport phenomena. In the petroleum en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock (geology)
In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects. Rocks are usually grouped into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis and lithification of sediments, which in turn are formed by the weathering, transport, and deposition of existing ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Core Recovery Parameters
Core recovery parameters describe the quality of core recovered from a borehole. Total core recovery Total core recovery (TCR) is the borehole core recovery percentage. TCR is defined as the quotient: :TCR = \left(\frac\right)\times 100 % :l_\mathrm = Sum of length of core pieces :l_\mathrm = Total length of core run Solid core recovery Solid core recovery (SCR) is the borehole core recovery percentage of solid, cylindrical, pieces of rock core. SCR is defined as the quotient: :SCR = \left(\frac\right)\times 100 % :l_ = Sum of length of solid, cylindrical, core pieces :l_ = Total length of core run Rock quality designation Rock-quality designation (RQD) is a rough measure of the degree of jointing or fracture in a rock mass, measured as a percentage of the drill core in lengths of 10 cm or more. High-quality rock has an RQD of more than 75%, low quality of less than 50%. Rock quality designation (RQD) has several definitions. The most widely used definition was developed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RMR Chart, Strength Ratings
RMR may refer to: * RMR layout (of an automobile), see rear mid-engine, rear-wheel-drive layout * Recife Metropolitan Region in Northeastern Brazil * Recurring Monthly Revenue, a measure of customer attrition * Registered Merit Reporter, a certification offered by the National Court Reporters Association * Resting metabolic rate, see basal metabolic rate * Revelstoke Mountain Resort, a Canadian ski resort located in Revelstoke, British Columbia * Rock mass rating, a rock mass classification system (geotechnical engineering) * RockMyRun, a running/workout mobile app * Royal Marines Reserve, the volunteer reserve force used to augment the regular Royal Marines * The Royal Montreal Regiment, a Canadian Forces infantry regiment based in Montreal * '' Rick Mercer Report'', a Canadian comedy television series * Ruggedized miniature reflex (optics), a type of weapon-mounted red dot sight for guns * Robust mouse rejuvenation, rejuvenating an elderly mouse so that its remaining life expectan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RMR Chart, Joint Density Ratings
RMR may refer to: * RMR layout (of an automobile), see rear mid-engine, rear-wheel-drive layout * Recife Metropolitan Region in Northeastern Brazil * Recurring Monthly Revenue, a measure of customer attrition * Registered Merit Reporter, a certification offered by the National Court Reporters Association * Resting metabolic rate, see basal metabolic rate * Revelstoke Mountain Resort, a Canadian ski resort located in Revelstoke, British Columbia * Rock mass rating, a rock mass classification system (geotechnical engineering) * RockMyRun, a running/workout mobile app * Royal Marines Reserve, the volunteer reserve force used to augment the regular Royal Marines * The Royal Montreal Regiment, a Canadian Forces infantry regiment based in Montreal * '' Rick Mercer Report'', a Canadian comedy television series * Ruggedized miniature reflex (optics), a type of weapon-mounted red dot sight for guns * Robust mouse rejuvenation, rejuvenating an elderly mouse so that its remaining life expectan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineering
Engineering is the use of scientific method, scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, vehicles, and buildings. The discipline of engineering encompasses a broad range of more specialized List of engineering branches, fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering. The term ''engineering'' is derived from the Latin ''ingenium'', meaning "cleverness" and ''ingeniare'', meaning "to contrive, devise". Definition The American Engineers' Council for Professional Development (ECPD, the predecessor of Accreditation Board for Engineering and Technology, ABET) has defined "engineering" as: The creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geotechnical Engineer
Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. It uses the principles of soil mechanics and rock mechanics for the solution of its respective engineering problems. It also relies on knowledge of geology, hydrology, geophysics, and other related sciences. Geotechnical (rock) engineering is a subdiscipline of geological engineering. In addition to civil engineering, geotechnical engineering also has applications in military, mining, petroleum, coastal engineering, and offshore construction. The fields of geotechnical engineering and engineering geology have knowledge areas that overlap, however, while geotechnical engineering is a specialty of civil engineering, engineering geology is a specialty of geology: They share the same principles of soil mechanics and rock mechanics, but differ in the application. History Humans have historically used soil as a material for flood control, irrigation purposes, buria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deformation (engineering)
In engineering, deformation refers to the change in size or shape of an object. ''Displacements'' are the ''absolute'' change in position of a point on the object. Deflection is the relative change in external displacements on an object. Strain is the ''relative'' internal change in shape of an infinitesimally small cube of material and can be expressed as a non-dimensional change in length or angle of distortion of the cube. Strains are related to the forces acting on the cube, which are known as stress, by a stress-strain curve. The relationship between stress and strain is generally linear and reversible up until the yield point and the deformation is elastic. The linear relationship for a material is known as Young's modulus. Above the yield point, some degree of permanent distortion remains after unloading and is termed plastic deformation. The determination of the stress and strain throughout a solid object is given by the field of strength of materials and for a structure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slope Mass Rating
Slope mass rating (SMR) is a rock mass classification scheme developed by Manuel Romana to describe the strength of an individual rock outcrop or slope. The system is founded upon the more widely used RMR scheme, which is modified with quantitative guidelines to the rate the influence of adverse joint orientations (e.g. joints dipping steeply out of the slope). Definition Rock mass classification schemes are designed to account for a number of factors influencing the strength and deformability of a rock mass (e.g. joint orientations, fracture density, intact strength), and may be used to quantify the competence of an outcrop or particular geologic material. Scores typically range from 0 to 100, with 100 being the most competent rock mass. The term ''rock mass'' incorporates the influence of both intact material and discontinuities on the overall strength and behavior of a discontinuous rock medium. While it is relatively straightforward to test the mechanical properties of ei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stand Up Time For Tunnels In Civil And Mining Engineering As A Function Of RMR
Stand or The Stand may refer to: * To assume the upright position of standing * Forest stand, a group of trees * Area of seating in a stadium, such as bleachers * Stand (cricket), a relationship between two players * Stand (drill pipe), 2 or 3 joints of drill pipe connected together on a drilling rig * Bus stand, where public service vehicles are parked between journeys; or specific stops in a bus station * Tree stand, platform used in hunting * The Stand Comedy Club, in Edinburgh, Glasgow and Newcastle upon Tyne * Stand, Greater Manchester, a residential area in England * STAND (organization) (originally ''Students Taking Action Now: Darfur''), a student activist group under Aegis Trust * A food business: ** Fruit stand ** Hot dog stand ** Lemonade stand * A support or holder, such as: ** Standing frame, assistive technology supporting a person who could not otherwise stand erect ** Kickstand of a bicycle or motorcycle ** Christmas tree stand ** Music stand ** Cymbal stand ** Re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Mass Modulus Of Deformation Em As A Function Of RMR
Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wales * Rock, Cornwall, a village in England * Rock, County Tyrone, a village in Northern Ireland * Rock, Devon, a location in England * Rock, Neath Port Talbot, a location in Wales * Rock, Northumberland, a village in England * Rock, Somerset, a location in Wales * Rock, West Sussex, a hamlet in Washington, England * Rock, Worcestershire, a village and civil parish in England United States * Rock, Kansas, an unincorporated community * Rock, Michigan, an unincorporated community * Rock, West Virginia, an unincorporated community * Rock, Rock County, Wisconsin, a town in southern Wisconsin * Rock, Wood County, Wisconsin, a town in central Wisconsin Elsewhere * Corregidor, an island in the Philippines also known as "The Rock" * Jamaica, an isl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
