Geotechnical Investigation & Consultancy for Uttarkhan Tunnel Project

Geotechnical Investigation & Consultancy for Uttarkhan Tunnel Project

Project Overview

The Uttarkhan Tunnel Project is a critical underground infrastructure initiative designed to improve regional connectivity and ensure smooth transportation flow across challenging terrain. The project required robust geotechnical expertise due to complex ground conditions, variable rock strata, and groundwater influences. Our team delivered end-to-end geotechnical investigation, testing, and consultancy services to support safe and efficient tunnel design and construction.

Location: Uttarkhan

Scope of Work

1. Geological & Geomorphological Assessment

  • Detailed surface geological mapping

  • Identification of fault lines, joints, shear zones

  • Slope stability analysis around the portal areas

  • Geological hazard identification

2. Geotechnical Investigations

  • Borehole drilling with rock core recovery

  • SPT and permeability testing

  • RQD, RMR & Q-System classification

  • Soil and rock laboratory testing (UCS, triaxial, Atterberg limits, grain size, etc.)

  • Groundwater level monitoring and permeability evaluation

3. Geophysical Surveys

  • Seismic refraction for bedrock profiling

  • Electrical resistivity imaging to detect weak zones

  • MASW for shear wave velocity analysis

These methods ensured accurate sub-surface modeling for tunnel alignment and support system design.

Engineering Analysis & Design Inputs

Tunnel Stability Analysis

  • FEM-based numerical modeling

  • Rock mass behavior prediction under excavation load

  • Analysis of support systems (rock bolts, shotcrete, ribs, segmental lining)

Ground Support Recommendations

  • Primary and secondary support systems

  • Shotcrete thickness and reinforcement detailing

  • Rock bolt spacing and anchoring depth

  • Grouting and ground improvement measures

Construction Stage Consultancy

  • On-site monitoring

  • Instrumentation: extensometers, piezometers, convergence monitoring

  • Real-time guidance for excavation sequences

  • Risk mitigation strategies for unforeseen ground conditions

Compliance & Quality Assurance

The project adhered to:

  • IS 15026, IS 12070, IS 2911

  • MoRTH & IRC guidelines

  • ITA standards for tunneling

  • Safety and environmental best practices

All investigations and testing were conducted following ISO/IEC 17025 laboratory standards.