REVIEW OF THE IMPLEMENTATION OF THE GUIDELINES FOR CALCULATING THE VOLUME OF SOFT ROCK EXCAVATION AND ROCK EXCAVATION (CASE STUDY: ALIGNMENT IMPROVEMENT PROJECT ON THE ACCESS ROAD TO THE MULTIPURPOSE CONTAINER PORT (WAE KELAMBU))

Abstract

Soft rock excavation and rock excavation in road construction projects are critical factors influencing cost, time, and quality. In practice, however, discrepancies often occur between the initial calculations (MC-0) and actual field conditions due to limited geotechnical data and inaccurate calculation methods. This study aims to evaluate the application of Circular Letter Number: 01/SE/Db/2025 regarding Guidelines for Calculating the Volume of Soft Rock and Rock Excavation in the Multipurpose Container Port Access Road Alignment Improvement Project (Wae Kelambu). The research employed a quantitative descriptive method with a case study approach. Primary data included topographic surveys, boring tests, Standard Penetration Tests (SPT), geoelectric tests, and uniaxial compressive strength laboratory tests, while secondary data consisted of contract documents, technical specifications, and design drawings. The findings reveal significant differences between MC-0 volume calculations and actual field volumes, influenced by sample point density and accuracy, local geological conditions, and analytical methods. Implementing the latest guidelines enhances calculation accuracy, minimizes the likelihood of claims and contract addenda, and supports cost and time efficiency. This study is expected to contribute to the practical application of technical guidelines in similar infrastructure projects, thereby reducing the risk of error in estimating excavation volumes.