There are several study materials and resources available for the optional subject of rock mechanics and tunneling in civil engineering. These resources can help students gain a comprehensive understanding of the subject and prepare for exams.

Textbooks:
- "Rock Mechanics for Underground Mining" by B.H.G. Brady and E.T. Brown: This book provides a detailed introduction to rock mechanics principles and their application in underground mining.
- "Tunneling in Rock" by R.K. Goel: It covers the fundamental principles of tunneling in rock, including design, construction, and stability analysis.
- "Rock Mechanics and Rock Engineering" by C. Jaeger and N.G.W. Cook: This textbook provides an in-depth understanding of rock mechanics principles and their application in civil engineering projects.

Reference Books:
- "Rock Slope Engineering" by D. Wyllie and C. Mah: It focuses on the stability analysis of rock slopes and provides guidance for designing stable slopes in civil engineering projects.
- "Tunnels and Tunneling" by F. Kulhawy and C. W. Wong: This book covers various aspects of tunneling, including excavation methods, ground support techniques, and tunnel design.

Research Papers:
- Students can refer to research papers published in reputed journals such as the International Journal of Rock Mechanics and Mining Sciences or the Tunnelling and Underground Space Technology journal. These papers provide insights into the latest developments and case studies in the field of rock mechanics and tunneling.

Online Resources:
- The EduRev website offers a wide range of study materials, including notes, videos, and quizzes, on rock mechanics and tunneling. These resources can be accessed for free and provide a convenient way to supplement textbook learning.
- Additionally, websites like ResearchGate and Academia.edu provide access to research papers and publications related to rock mechanics and tunneling.

Classroom Lectures and Tutorials:
- Attending classroom lectures and tutorials conducted by professors or industry experts can provide valuable insights into the subject. These sessions often include discussions, problem-solving exercises, and real-life case studies.

In conclusion, there are numerous study materials and resources available for the optional subject of rock mechanics and tunneling in civil engineering. Students can make use of textbooks, reference books, research papers, online resources, and classroom lectures to gain a comprehensive understanding of the subject and excel in their exams.