Abstract Drill and Blast (D&B) and Tunnel Boring Machine (TBM) are the two dominating
excavation methods in hard rock tunnelling. Selection of the cost effective excavation …

Drill and blast method is an accepted technique of tunnel excavation but it often causes over-
break or even threatens the stability of the surrounding rock. Moreover, the rock mass mostly …

Probabilistic time estimation is an essential part of proper risk management in tunneling
projects. In recent decades, several models have been developed for this purpose, one of …

Purpose is to evaluate experimentally and theoretically a mechanism of solid media
fracturing by means of explosive charges varying in their cross-sectional shapes. Methods …

Budget overrun and schedule delay of infrastructure projects result in the mismanagement of
huge amounts of resources. Studies show that accounting for uncertainties in time and cost …

Current drift advance rates in mining fall short of expectations with advances in drilling and
blasting technologies. Quick access to orebodies improves their net present value (NPV) …

On the basis of the existing NTNU (Norwegian University of Science and Technology)
advance rate model and field experiences, an estimation model which can analyze …

This paper analyses the construction time and advance rate of a 3 km long drill and blast
tunnel under various geological conditions using an upgraded NTNU drill and blast …

Purpose. Drilling-blasting technology is one of the simplest and most often used techniques
in open pit mining. This allows the excavation of a large volume of rock and useful mineral …

This paper provides an overview of existing approaches to construction time and cost esG
timates. While the deterministic estimates are commonly based on analysis of data (average …