The chapter "Underground Excavations in Rock" by E. Hoek and E.T. Brown, published by the Institution of Mining and Metallurgy, provides an overview of the design and construction of underground excavations in various rock types. The authors acknowledge the complexity of the task and the diversity of applications, ranging from mining to civil engineering. They aim to address common problems in the design of underground excavations and offer a clear explanation of how these issues can be managed. The book is intended as an introduction rather than a comprehensive guide, with over 600 references provided for further study. The text primarily uses the SI system of units but also includes examples and tables in Imperial units to cater to a broader audience. The authors emphasize that the book is published on a non-profit basis and does not generate royalties for them or their organizations.The chapter "Underground Excavations in Rock" by E. Hoek and E.T. Brown, published by the Institution of Mining and Metallurgy, provides an overview of the design and construction of underground excavations in various rock types. The authors acknowledge the complexity of the task and the diversity of applications, ranging from mining to civil engineering. They aim to address common problems in the design of underground excavations and offer a clear explanation of how these issues can be managed. The book is intended as an introduction rather than a comprehensive guide, with over 600 references provided for further study. The text primarily uses the SI system of units but also includes examples and tables in Imperial units to cater to a broader audience. The authors emphasize that the book is published on a non-profit basis and does not generate royalties for them or their organizations.