Found insideThis multi-volume work sets a new standard for rock mechanics and engineering compendia and will be the go-to resource for all engineering professionals and academics involved in rock mechanics and engineering for years to come. Found inside – Page 40( a ) Schistosity and bedding cleavage : The effect of overbreak along schistosity or bedding cleavage has been clearly ... With closer spacing the rocks are more fractured and the blocks are of smaller size . ... This results in collapses from the roof or wall depending on the attitude of these planes with respect to the tunnel ... This manual was prepared by the U.S. Army Corps of Engineers and provides technical criteria and guidance for the planning, design, and construction of tunnels and shafts in rock for civil works projects. Found inside – Page 1143After the first fault, the rock mass is more schistose and direction and dip are ... later in the following West tunnel, but along a much shorter distance. Found inside – Page 235simplicity of solution ; but in its potential extension into a meaningful stability analysis . ... The stability analysis is more than a tabulation of stress concentration factors . ... or bursting of tunnel walls in a massive rock due to high primitive stresses has been clearly pictured , in Fig . ... The splintering failure of entry walls parallel to an existing schistosity has even been termed « beam - like slabbing » , again ... It is a continuation of the successful series of regional ISRM symposia for Europe, which began in 1992 in Chester, UK. EUROCK 2009 was organized by the Croatian Geotechnical Society. This classic handbook deals with the geotechnical problems of rock slope design. Found inside – Page 45The acute angle between this foliation and the bedding planes varies between 20 and 65 degrees in those specimens placed in the ... The caves consist of a labyrinth of passages , tunnels and caverns , some open to surface , covering a linear distance of more than 750 feet . ... When the roofs of such caverns collapse , so providing access to surface , they are known as sink holes or swallow holes . Found inside – Page 32Most of the geologic information has to be mainly interpreted based on subsurface data . ... The tunnel alignment in phases II and III cuts across an alternation of schistose and quartzitic rock types of the Dalings and Buxas in addition ... But however proper choice of alignment based on stability evaluation would minimise such failure . ... Squeezing ground , roof falls as a consequence of minimum stand - up time ; running ground conditions specially when cutting across the thrust slices ... This manual focuses primarily on the civil elements of design and construction of road tunnels. Found inside – Page 135Locally bolts in roof 10 ft 2 in. in roof where None || 3–5 ft advance. long, ... in fact relate to the surface most likely to allow failure to initiate. 4. Found inside – Page 71The more easterly tunnel , 5760 ft ( 1755 m ) long , carries water from the Allt Bhran into a small reservoir from which it flows into the more ... Of these , the most abundant are granulites , ( metapsammites ) , of a well - bedded , flaggy character , the schistosity of which ... such blocks melted , the roof would collapse but in some cases boulders might interlock like an arch and form the roof of an open vault . Found insideEngineering Properties of Soils and Rocks, Third Edition serves as a guide to the engineering properties and behavior of soils and rocks. The text also complements other texts on rock and soil mechanics. Found insideThe first comprehensive treatment of the subject of design methodology in rock engineering, this book emphasizes that a good designer needs not only knowledge for designing (technical knowledge) but also must have knowledge about designing ... A static map is no longer enough; there is now demand for a dynamic representation. Time is of great importance when operating on real world geographical phenomena, especially when these are dynamic. Found inside – Page 158Thus it can be inferred that for most rocks the effects of elastic anisotropy are no larger than the normal variations in rock ... that the effects of anisotropy of strength of rocks are much more important in failure under inhomogeneous stress than effects of ... In the case where the schistosity strikes parallel to the tunnel axis and dips vertically , the unloading extends further ... The largest roof settlement occurs in the case of a horizontal schistosity because the smaller Young's modulus is the ... Found insideUnderground Excavations in Rock deals with the geotechnical aspects of the design of underground openings for mining and civil engineering processes. Found inside – Page iiThis book is intended primarily to serve this need and aims at the clear explanation, in adequate depth, of the fundamental principles, requirements and procedures of soil and rock tests. Found inside – Page 204Concretely , these anomalies show in excavation methods and support measures in tunnel construction , which usually demand ... schist in three dimensional stress conditions are shown graphically in Fig.1 with Mohr stress diagram and failure . ... more reliable relations between quoted geotechnical characteristics , excavation method and tunnel tubes supporting . ... as instalment of pipe roof , elephant foot and temporary invert arch to enable finishing designed tunnel profile . Found inside – Page 97Closely - spaced along the horizontal schistosity . ... The observed size that the present contact existed when the observed joints distribution , in particular the lack of fines , is ... This is consistent with the deduction earlier that the Locally platy jointing is more complex and is sharply ... of the pipe ceases to be available to accommodate is sequential ; fractures form , the roof collapses to form new dilation . Found insideThis is a comprehensive and practical work which also gives access to user-friendly computer programmes which enable the investigation and design of support techniques. Details on how to obtain this software are also included in the book. Found inside – Page 35West of the Upper West Branch Priest River , a part of a roof pendant of metamorphic rocks is composed mainly of rusty - weathering quartz mica schists . ... Since the attitude of the schistosity in the southern part of sec . ... It has previously been pointed out that a difference in depth of burial , those in the north of the area having been more deeply buried ... The workings of the " Old Bead Lake " tunnel , the Kootenai Conquest , and the Comstock claim of the Alger group , represent the ... Found insideThis volume presents a comprehensive report on the state of the field, with an interdisciplinary viewpoint, case studies of fracture sites, illustrations, conclusions, and research recommendations. Found inside – Page 17360 F & 0-90 / 80 10 2070 30 Tunnels & Tunnelling , October , 1981 17 information , but because of incorrect interpretation of the information availHole axis able or failure to collect the appropriate Vertical ... More attention Roof and floor 30 was given to the reaction of joints to these Walls 01 -60+ effects in two papers , and of the 90-0 remaining ... providing a 10stratified non - deterministic update of the “ LADAR ' 30'ø or schistose model and introducing probability theory 10 ' 20 ' 0 to ... Found insideWith this book in hand, engineers will be able to gather geotechnical data, either from rock cuts, drifts or core, and process the information for subsequent analysis. This book is made up of contributions dealing with heritage stones from different countries around the world. The stones are described, as well as their use in vernacular and contemporaneous architecture. Found insideThe results obtained from the research work were systematically compiled to produce this book which bears particular relevance to civil, mining and petroleum engineers and geologists. Rock masses are initially stressed in their current in situ state of stress and to a lesser natural state. Found insideThis is the first authoritative reference on rock mass classification, consolidating into one handy source information once widely scattered throughout the literature. Found inside – Page 40... and is characteristic of some schistose and cleaved rocks . The third process is more complex to characterize and is associated with the formation of " soil " weathering products at the discontinuity boundaries , with " lithoretic ... This ratio is certainly useful to indicate the probability of brittle or plastic failure of intact rock in a tunnel . Also a ... This ratio governs the probability of roof falls without fracture or flow , the " block mechanics " as opposed to " fracture mechanics " of the tunnel . Found insideThis book includes 29 contributions which present ongoing or recently completed research in various aspects of rock mechanics, as well as examples of current practice with advanced technologies or methods.On the whole, this book offers an ... Found inside – Page 831A type of schistosity in crystalline schists characterized by the ... Plane shear failure results when a natural plane of weakness such as a fault , a shear ... Found insideTunnelling has become a fragmented process, excessively influenced by lawyers'notions of confrontational contractual bases. This multi-volume work sets a new standard for rock mechanics and engineering compendia and will be the go-to resource for all engineering professionals and academics involved in rock mechanics and engineering for years to come. Found inside – Page 153Lithologically , they are more prominent in Banjar slate - phyllite , metabasics and Garsah dolomite . ... Lineaments are found to be more common in intrusive granite , Manikaran quartzite and schistose gneiss ( about 3 to 4 sets ) while less ... Hence , the thrust zones may create engineering construction problems like heavy water percolation , roof collapse , squeezing pressure etc. while tunneling . 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