4,067 research outputs found
Carnet de J.D. CHAUPIN
No full textThis 199-page handbook is a monograph on Notre-Dame de Vaulx, a French village located in the Isère département of the Rhône-Alpes region, authored by J.D. CHAUPIN. It was completed in May 1958 and dedicated by the author to his grand-daughter Danielle Marthe CHAUPIN. The first fifty pages contain a glossary of more than 1500 words and the most popular expressions in matheysin patois.The version available here is a second-generation xerox copy of the manuscript collected by Jacqueline DUC, a specialist of matheysin patois.Ce carnet de 199 pages est une monographie sur le village de Notre-Dame de Vaulx, une commune française située dans le département de l'Isère et la région Rhône-Alpes, rédigée par M. J.D. CHAUPIN. Achevé en mai 1958, il est dédicacé à sa petite fille Danielle Marthe CHAUPIN. Il contient sur une cinquantaine de pages un glossaire de plus de 1500 mots ainsi que les expressions les plus courantes en patois matheysin.La version déposée ici est une photocopie de seconde génération du manuscrit réalisée par Jacqueline DUC, spécialiste des patois matheysins
The formation of valley-wall rock glaciers
No full textIn recent years, the study of rock glaciers has increased remarkably. Substantive
progress has been made, particularly in understanding the formation of rock
glaciers that have developed adjacent to existing or former valley or cirque
glaciers, However, our understanding of valley-wall rock glaciers that are
located at the base of talus slopes remains scant. Published work exhibits little
consensus on the formation of valley-wall rock glaciers and several hypotheses
remain under vigorous debate. The major objective of the research reported in
this thesis has been to test the generality and feasibility of seven major models
of valley-wall rock glacier formation using both empirical and theoretical
evidence. The primary conclusion is that only one of these models, the
segregation ice model, emerges as a general model of valley-wall rock glacier
genesis. The model assumes that a thin layer or several thin layers of
segregated ice are overlain by interstitially frozen sediments and an unfrozen
mantle of coarse debris. A wide range of empirical and theoretical findings are
shown to be consistent with the implications of the segregation ice model.
Detailed observations on the morphology, sedimentology and distribution of
active, inactive and relict valley-wall rock glaciers studied in Switzerland,
northern Norway and Scotland provided a range of findings that support this
model. Theoretical evidence was obtained by modelling a number of different
density models that reflect different distribution of internal ice by applying a
simple laminar flow equation to field measurements. Although only the
segregation ice model appears to be valid at a general level, the possibility
cannot be excluded of alternative modes of valley-wall rock glacier formation
under particular circumstances. Snow avalanching, deformation of snowbank
or matrix ice, and basal sliding under conditions of high hydrostatic pressure all
constitute possible contributing mechanisms of formation and movement in
particular cases
The computer simulation and prediction of rock fall
No full textThis thesis deals with the study of rock falls using a mathematical model, codified for computer use, entitled GeoFall. GeoFall, which was developed by the author, allows predictions to be made of rock fall trajectories, run out distances and kinetic energies for a rock of any arbitrary shape. Its main purpose is to assist in the design of remedial works. The mathematical model is based on rigid body mechanics, and analyses a fall in 2D space using a new theory of impact dynamics developed by Brach (1991). The main features and algorithms of the program are presented in this thesis. The performance of GeoFall was evaluated by comparing actual rock fall events described in several published papers with the output created by GeoFall. Also the output from GeoFall has been compared with the output from other rock fall simulation programs used to simulate the documented rockfalls. A new rock slope inventory system entitled the Rock Fall Risk Assessment System (RFRAS) has been developed by the author to determine the rock fall risk at specific rock fall sites. It consists of three phases of inspection, the slope survey, and the preliminary and detailed rating phases. The detailed rating phase uses 13 parameters that when assessed, evaluated and totalled, numerically differentiates slopes from the least to the most hazardous producing an overall rating in the range 21-1926. It not only allows the relative risk of rockfall between slopes to be assessed but it also categorises the rock fall risk and the potential number of future rockfalls. It has been tested on 18 slopes at ten locations in County Durham. The final part of the thesis details a new laboratory based procedure that can be used to determine the coefficients of restitution for any type of rock material. The normal coefficient of restitution has been determined for seven different types of rock, and the tangential coefficient of restitution has been determined for a local sandstone. Some tentative correlations between the normal coefficient of restitution and the rocks physical properties, such as its Unconfined Compressive Strength (UCS) have been presented
Distinctive rock formation, with rock pools on a ledge beside the sea, Australia, ca. 1890 [transparency] /
No full textCondition: Spots on plates.; Inscriptions: "J.D. Edward, on slide Maker, 43 Gt. King St., Edinburgh."--Label on mount below image.; Part of the Collection of lantern slides of views of Australia, 1873-1900.; Title devised by cataloguer based on inscription.; Also available in an electronic version via the internet at: http://nla.gov.au/nla.pic-vn4312899
Mechanisms of failure of jointed rock masses and the behaviour of steep slopes
No full textThe geomorphological behaviour of steep jointed rock slopes has been studied using distinct element method computer models. In order to model steep slopes effectively, methodologies need to be combined from the studies of environmental modellers, geomorphologists and engineers. The distinct element method is ideal for the study of the development of jointed rock masses as the discontinuum approach can model the progressive failure of rock blocks along discontinuities. Initial, theoretical modelling identified the limiting boundary conditions between the multiple block failure mechanisms of toppling, sliding and toppling-and-sliding, based upon the discontinuity geometry for a theoretically modelled limestone rock mass. It is demonstrated that joint dip, friction angle and spacing exert the greatest control upon rock mass failure mechanisms. Two field locations, the Colorado Plateau and the Isle of Purbeck, have been chosen to provide a link between theoretical modelling and classic rock mass landforms which are controlled by variation in discontinuity geometry. In the Portland Limestone of the Isle of Purbeck, it is the joint geometry variation which influences development. Bedding steepens and average block size decreases in the coastal rock cliffs from east to west. Comparison between the model outputs highlighted that there is an increase in the rate of simulated cliff retreat from Winspit in the east to Durdle Door in the west. The Colorado Plateau rock cliffs form large, embayed plan-form escarpments and detached monoliths. It is the variation of joint set spacing in the cap-rock of cuesta-form composite scarps that controls development. Model results suggest there is a continuum of rock mass landforms, with buttes becoming detached at plan-form necks in the escarpment as determined by the joint geometry. The results show excellent similarity with the landforms observed in the field. This thesis introduces a research tool that can provide an understanding of slope behaviour
Assessment of rock stability in natural and man-made cavities
No full textUnderground voids of natural or anthropogenic origin potentially represent a serious hazard to the
built-up areas. Urban development and construction of infrastructures often is carried out without
taking into account the possibility of encountering subsurface cavities, and the corresponding danger
these might pose. In addition, loss of memory of man-made cavities under the historic part of many
towns adds further problems. Evaluation of the stability of rock masses in underground setting is not
an easy matter, since it requires, in addition to the geological and engineering background,
speleological skills and techniques in order to explore and survey the cavities, identify the type of
failures occurring therein, and collect the data necessary for the implementation of specific numerical
analyses.
In this paper we present an approach involving cavers, geologists and engineers to assess the rock
mass stability in natural and man-made caves, aimed at determining the control of rock failures in the
formation of sinkholes. The methodology is described through the application to a natural karst cave
and an anthropogenic cavity in Apulia, SE Italy. In both cases, following a detailed speleological
survey which is specifically addressed to define the complete cave topography, the geo-mechanical
characterization of the carbonate rock mass was carried out, and the data so obtained were used to
evaluate the rock mass stability by means of numerical codes
Portraits of Mr. and Mrs. J.D. Taylor and Mrs. N. Thompson
No full textA photograph of J.D. Taylor and a picture of Mrs. J.D. Taylor possibly a newspaper clipping. Also a photograph of Mrs. N Thompson and a picture of her possibly a newspaper clipping as well.[Front] Mrs. J.D. Taylor 1843; Great Uncle and Aunt -Taylor-; Mrs. N Thompson 1829; Great Grandmother Thompson; H. Skulaso
Geology of Graham Island, British Columbia
No full textby J.D. Mackenzie.Series ; Bulletin (Geological Survey of Canada : 1921). Geological series ; no. 72. Memoir (Geological Survey of Canada) ; 88. Accompanies Southern portion of Graham Island, Queen Charlotte Islands, British Columbia [cartographic material] / geology, J.D. Mackenzie ; geography, British Admiralty and Department of the Naval Service of Canada, Department of Lands, British Columbia, J.D. MacKenzie ; C.O. Senecal, geographer and chief draughtsman. Two folded maps in pocket
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