... on thin siltstone inter-bed lenses. The role of the two sets of sub-orthogonal, primary non-diastrophic joints in forming and releasing the blocks is recognised. Block movements are found to be only partly governed by the interaction between the topography and the dip of the strata. An explanation...

... Specimen requires more than one blow of a geological hammer to fracture it Limestone, marble, sandstone, schist R3 Medium strong 25 - 50 1 - 2 Cannot be scraped or peeled with a pocket knife, specimen can be fractured with a single blow from a geological hammer Concrete, phyllite, schist, siltstone R2 Weak...

... criterion sandstone Upstream Oil & Gas shear zone weak soft rock critical state approach Reservoir Characterization stability analysis borehole investigation determination structural geology Siltstone slaty siltstone construction work shear test stratification soft rock approx...

... Upstream Oil & Gas Siltstone rehabilitation Reservoir Characterization clay schist knowledge management strength steel rib rockbolt highway tunnel structural geology primary support lining construction settlement case study serpentinite region II shotcrete flysch tunnel...

... 500kN rams with a stroke of 100mm, each ram acting only in push. (Figure in full paper) Upstream Oil & Gas displacement hydraulic fracturing comminution dominant parting plane surface area parting plane Directional Drilling friction Siltstone specimen sandstone coefficient...

..., occasionally with interlayers of siltstone or interbedded sandstone and siltstone. Figures 3 and 4 present the geology and rock mass quality of the powerhouse cavern. The most prominent geologic feature in the cavern area is a series of bedding parallel faults (clay gouge seams parallel to bedding...

.... Thelander 1982)., In the tunnel this formation is represented by a horizontally bedded, greenish grey siltstone with a basal congiomerate. Together the Sjöfall Suite and the Torneträsk Formation compose the autochthonous bedrock beneath the mountain chain, and the downstream parts of the tunnels lie...

... SUMMARY: Geological and geotechnical investigations for the Power Station Complex of the Drakensberg Pumped Storage Scheme, which is sited in an essentially horizontally interbedded sequence of sandstones, siltstones and mudstones, are described. Investigations included surface mapping...

... siltstones and clayey siltstones) and sandstones in engineering terms. Relationships between physical properties, lithology and mineralogy have been investigated to determine those properties that are relevant to the performance of these rocks in roading. Published systems of classification, principally...

... INTRODUCTION The foundation rock of the first stage construction of Gezhouba project belongs to the lower Gretaceous series strata of land facies and rocks are sedimentary siltstones, argillaceaus siltstones with medium-fine grained sandstones. The rock strata have strikes of N20–40 degrees E...

... Characterization compressibility cementation deformation behaviour yoshinaka volumetric deformation soft rock effective stress relation Siltstone miocene 0 mechanical property granite sedimentary rock compression deformation r:r.»i . 1ÁM1 Rom.. I^OMb , A: /Y. c 1 ^ ^^ r ^^ : ' WS  ^ A ^^ llw_...

... with widespread strain slips; IB, the sfotened argil1ized claystones with local strain slips and ~, the clay- stones. Pattern II. The argillaceous and elayey siltstones, containing two subspe- ciesl IIA, the incompetent argillaceoussiltstones with local strain slips and IlBr the clayey siltstones. Pattern III...

... Upstream Oil & Gas structural geology Siltstone metals & mining strength coal deposit sandstone shale main host rock investigation Reservoir Characterization engineering property Obi coal deposit discontinuity coal seam consideration aquifer fracture host rock deposit...

... be overlain by Tertiary 1451 basalt remnants or thin deposits of Quaternary alluvium. The Tertiary sediments vary widely in composition and properties. They predominantly comprise thick sequences of poorly graded coarse sands with thinner clay and siltstone bands. The sands are generally cross- bedded...

... in the jointed rock, close to the blast-hole mouth a tangible mass strength formula experiment rock mass Reservoir Characterization strength Siltstone rock mass strength different strength Upstream Oil & Gas dimension crater specimen graph reservoir geomechanics crater depth cohesion...

... Reservoir Characterization strength weak rock physico-mechanical property wellbore integrity Siltstone sandstone shear strength Upstream Oil & Gas argillite value 0 test station tunnel Rock Pressure Wellbore Design vertical rock pressure drainage tunnel structure foundation...

... of about 1300 m/s has been defined as a limit of critical loosening of roof over the excavation. Reservoir Characterization Thickness excavation roof rock compactness metals & mining goave qualitative classification loosening Upstream Oil & Gas Siltstone vitesse longwall front...

... of permissive surface of roof exposure for flitting the support sets which in turn determines the type of support usable in the given geological and mining conditions. relation Thickness criteria stability Upstream Oil & Gas individual fall Siltstone load bearing capacity index number...

... & mining Thickness infrared method sandstone rebound hammer Siltstone measurement result detectability Schmidt Antoni Kidybtriskt , D. Eng. Bronislaw Kajewski, Mgr Central Mining Institute, Katowice LOOSE-ROCK FALL HAZARD EVALUATION BY INFRARED AND RE- BOUND METHODS O!tEHKA OllACHOCTH...