TZ 231-2007 in English

This document provides detailed guidance on the procedures and operations involved in the drilling and blasting method for railway tunnel construction. It outlines the sequence of operations, technical requirements, and safety measures necessary for the effective execution of tunneling works using this method. The content covers various aspects including site preparation, drilling techniques, blasting parameters, support installation, and monitoring during the construction process. It serves as a reference for engineers, technicians, and construction personnel involved in railway tunnel projects. The document includes specifications for materials, equipment, and quality control measures to ensure the structural integrity and long-term performance of the tunnel. It also addresses environmental considerations and emergency response protocols relevant to tunnel construction activities.