Geological investigations are very essential in tunneling projects.
BPC has been entrusted many times for detailed geological mapping of Tunnel locations in the challenging North eastern region of India. Pre-construction mapping of railway & highway tunnels portals are carried out by our superiorly experienced geologist who collect all the field data like dip, strike, fold, fault information and then compile those with the paper data obtained from different authentic sources to prepare a detailed geological report mentioning the potential hazard and recommends if any change in alignment of tunnels are necessary to ensure a safe and sustainable construction.
Contouring of the tunnel is conducted by topographic survey and the data is used for proper drainage plan of tunnel portal and approaches.
Solutions to following engineering problems connected with tunneling:
- Selection of Design for the Tunnel
- Selection of Tunnel Route (Alignment)
- Selection of Excavation Method
- Assessment of Cost and Stability
- Assessment of Environmental Hazards
Geological Profile of Tunnels:
Such a profile generally provides information regarding the following aspects of the proposed route:
(a) Location and depth of exploratory bore holes and shafts etc.
(b) Types of rocks and their geochemical characters such as whether consolidated or unconsolidated, fissured and decayed or fresh;
(c) Structure of rocks, that is, whether stratified, or massive, horizontal or inclined, and if inclined, degree and direction of inclination; folding and faulting with full details.
(d) Hydrological conditions along the profile line; whether the line is above or below the water table and its relation to any aquifer that is likely to be intercepted;
(e) Ground temperature conditions, projected down to the tunnel axis based on calculations and observations.
