none 10.1144/GSL.QJEG.1971.004.03.01 Geological Society of London Geological Society of London 1881 29573505 469754 2024111903323300867 10.1144 2024-11-19T13:31:31Z 2007-09-28T01:26:34Z 132 Quarterly Journal of Engineering Geology QJEGH 0481-2085 05 16 2007 07 1971 4 3 Peter George Fookes 3 Hartley Down, Purley, Surrey (formerly Imperial College, Engineering Geology Division). William Robert Dearman Reader in Engineering Geology, Department of Geology, University of Newcastle-upon-Tyne. John Allan Franklin Soil Mechanics Ltd., 65, Old Church Street, London S.W.3. Summary Weathering and weatherability have been defined and a general scheme of weathering classification has been developed for engineering. Fundamental mechanical changes in behaviour due to weathering are considered for both intact rock and discontinuous rock, and a brief study is made of available field and laboratory tests to assess weathering and weatherability. From this, suggestions are made for classification schemes designating rock quality for mapping and core logging. The results of fieldwork and laboratory studies on weathered rocks mainly from the Dart-moor area, S.W. England, are given. Several different rock types, including granite, dolerite, limestone and mudstone, have been classified on the weathering scale, tested in the field by point loading and Schmidt hammer, and laboratory determinations of strength and porosity made. The results show clear trends of decreasing strength and fracture spacing with increased weathering and general conclusions and observations on engineering weathering classifications have been drawn. In early stages of weathering it appears that there is a general increase of fractures per unit volume and in later stages of weathering there is a rapid increase in chemical decay. In addition, geometrical distributions of weathering in fold and fault situations have been examined. The full implications of Tertiary warm climate weathering and Quaternary cold climate weathering are not yet clear. 06 06 2022 07 1971 139 185 10.1144/GSL.QJEG.1971.004.03.01 https://doi.org/10.15223/policy-002 10.1144/GSL.QJEG.1971.004.03.01 https://www.lyellcollection.org/doi/10.1144/GSL.QJEG.1971.004.03.01 https://www.lyellcollection.org/doi/pdf/10.1144/GSL.QJEG.1971.004.03.01 https://geoscienceworld.org/qjegh/article-lookup?doi=10.1144/GSL.QJEG.1971.004.03.01 Meded. Landb. Hogesch. van. Baren, F. A. 1 1931 van. Baren, F. A. 1931. Properties and constitution of a volcanic soil built in 50 years in East Indian Archipelago. Meded. Landb. Hogesch. Wageningen, 35, 1–39. 10.1086/622345 Am. Soc. Testing Mats. Bloem, D. L. 497 1966 Concrete aggregates—Soundness and deleterious substances. Bloem, D. L. 1966. Concrete aggregates—Soundness and deleterious substances. Am. Soc. Testing Mats. Special Publ. STP169-A 497–512. 10.2475/ajs.s5-26.152.97 Proc. Ussher Soc. Bristow, C. 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