This paper explores the design and construction innovation for the Cut-and-Cover Tunnel segment within the Mumbai Nagpur Expressway project in Maharashtra, India. With a meticulous emphasis on design principles and construction techniques, the paper outlines the innovative utilization of specific backfill materials to achieve ideal soil structure interaction and cost-effectiveness. By classifying chosen backfill materials according to their characteristics and performance, the paper illustrates a systematic approach to enhance load distribution and stability while mitigating environmental impact. Through thorough analysis and innovative engineering solutions, the paper offers valuable insights into the successful implementation of the Cut-and-Cover Tunnel within demanding geological conditions.