The engineering petrography of a weathered granite in Cornwall, England

Summary Five stages and three substages of weathering of rock material have been recognized in the granite from Hingston Down, east Cornwall, England. Changes involved in the seven stages have been characterized quantitatively by petrographic modal analysis of thin slices of the rock and determination of a micropetrographic index Ip. A second quantitative index is the microfracture index, Ift. Mass weathering grades may be characterized in terms of petrological changes in granite materials comprising each grade, and may be quantified in terms of the various micro-petrographical indices.

[1]  W. H. Ward,et al.  GEOTECHNICAL ASSESSMENT OF A SITE AT MUNDFORD, NORFOLK, FOR A LARGE PROTON ACCELERATOR. , 1968 .

[2]  Peter Lumb,et al.  The Properties of Decomposed Granite , 1962 .

[3]  The logging of rock cores for engineering purposes , 1977, Quarterly Journal of Engineering Geology.

[4]  H. Weinert,et al.  BASIC IGNEOUS ROCKS IN ROAD FOUNDATIONS , 1964 .

[5]  I. Jeg,et al.  The preparation of maps and plans in terms of engineering geology , 1972, Quarterly Journal of Engineering Geology.

[6]  W. R. Dearman,et al.  Engineering classification and index properties of a weathered granite , 1978 .

[7]  Gene Simmons,et al.  Toward a quantitative relationship between elastic properties and cracks in low porosity rocks , 1975 .

[8]  PETROGRAPHIC INVESTIGATIONS OF ROCK DURABILITY AND COMPARISONS OF VARIOUS TEST PROCEDURES , 1965 .

[9]  J R Mcwilliams.  THE ROLE OF MICROSTRUCTURE IN THE PHYSICAL PROPERTIES OF ROCK , 1965 .

[10]  D. G. Price,et al.  Geological Society Engineering Group Working Party report on the logging of rock cores for engineering purposes , 1970, Quarterly Journal of Engineering Geology.

[11]  I. Iliev.  An Attempt to Estimate the Degree of Weathering of Intrusive Rocks From Their Physico-mechanical Properties , 1966 .

[12]  H. Weinert.  Engineering petrology for roads in South Africa , 1968 .

[13]  M. Stone,et al.  The Metasomatic Origin of the Potash Feldspar MegaCrysts in the Granites of Southwest England , 1961, The Journal of Geology.

[14]  D. G. Moye.  Engineering geology for the Snowy Mountains scheme , 1955 .

[15]  J. A. Franklin,et al.  THE POINT-LOAD STRENGTH TEST , 1972 .

[16]  R. J. Willard,et al.  Microstructural techniques in the study of physical properties of rock , 1969 .

[17]  J A Franklin,et al.  A ROCK CLASSIFICATION SYSTEM APPLIED IN CIVIL ENGINEERING. PART 2 , 1971 .

[18]  Herman H. Rieke,et al.  Tensile strength related to mineralogy and texture of some granitic rocks , 1970 .

[19]  Mendes F De,et al.  THE USE OF MODAL ANALYSIS IN THE MECHANICAL CHARACTERIZATION OF ROCK MASSES , 1969 .