کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6408024 1629215 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deep weathering of granitic rocks: A case of tunnelling in NW Spain
ترجمه فارسی عنوان
فرسایش عمیق سنگ های گرانیتی: مورد تونل زنی در شمال اسپانیا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- Deep saprolite in NW Spain has caused significant technical issues during tunnelling.
- Fresh rock, saprock and two saprolite facies are clearly differentiated.
- Chemical and mineralogical changes due to the weathering are described.
- Geotechnical and hydrogeological properties of the materials are discussed.

This paper highlights a case of extensive development of saprolith from granitic bedrock in NW Spain. The weathering front at the study area extends to more than 250 m in depth. The drilling of a railway tunnel (Madrid-Galicia high-speed line) through the bedrock and saprolith resulted in significant technical issues and economic losses. Cross-sections revealing the 3D complexity of saprolith development are mainly based on fieldwork, boreholes, laboratory tests, and the excavation works. Saprock is always observed overlying unweathered igneous bedrock. Two saprolite facies, one clay-rich and the other clay-poor overlie the saprock; the recognition is based on several criteria. These deposits gradually thicken from the boundaries between the granitoid and metasedimentary roof pendants. Factors controlling saprolith development are discussed, and the chemical and mineralogical changes and trends that occur are described. Variations in some geotechnical properties and the loss of quality of the rock masses from an engineering perspective are also quantified.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: CATENA - Volume 137, February 2016, Pages 572-580
نویسندگان
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