An excavatability classification system for surface excavation in sedimentary rocks

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• 作者：Maybelle Liang ; Edy Tonnizam Mohamad…
• 关键词：Excavatability classification ; Productivity ; Practical excavation ; Rock properties ; Joint characterisation
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：76
• 期：1
• 页码：241-251
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Geoengineering, Foundations, Hydraulics; Geoecology/Natural Processes; Nature Conservation;
• 出版者：Springer Berlin Heidelberg
• ISSN：1435-9537
• 卷排序：76

文摘

This paper describes the development of an excavatability classification system for surface excavation of weathered sedimentary rock based on practical excavations and statistical analysis. Extensive field and laboratory studies were undertaken on three sedimentary rock sites with a range of weathering and strength conditions in the Iskandar region, South Johore, Malaysia. Rock mass descriptions were made in the field and rock material tests were carried out in the laboratory. Statistical analysis was used to study the correlation between the rock parameters and the productivity of excavation. A classification rating system based on the analysis results is proposed. The proposed classification system incorporates rock parameters such as point load strength (Is₅₀), Schmidt Rebound hammer value (R), uniaxial compressive strength (UCS), density of rock (γ), indirect tensile strength (ITS), second-cycle of slake durability index (Id₂), joint number (J_n), joint spacing (J_s), joint length (J_L), joint direction (J_d), existence of iron pan (IP), moisture content (M_c) and existence of bedding. The proposed model was then verified against further excavations on another sedimentary rock site. It was found that the productivities recorded correlated well with the proposed system when tested on a fourth site.