Application of Modern TSP Technology for Advanced Prediction Prior to Launching TBMs Shiva & Shakti for Up and Down Line Tunnels in the Himalayan Geology of the Rishikesh-Karan Prayag BG Rail Line Project in Uttarakhand, India.
Author(s):
GAJENDRA PRATAP SINGH, Dr. Prof. Sandeep Potnis
Keywords:
Tunnelling, rock mechanics, RMR, engineering geology, TSP, Ground Parameters, TBM -tunneling, NATM, Geotechnical Assessment, Junction, refraction, cavity shear, water bearing, strata zones.
Abstract
The application of Modern Tunnel Seismic Prediction (TSP) technology in the Rishikesh Karan Prayag new BG rail line project (RSKH-KNPG), particularly in Package-4, has been pivotal in predicting rock mass conditions ahead of the Up and Down line tunnels at both faces. This advanced method has facilitated a comprehensive and accurate study of rock mass behavior, conditions, weak features, projections, weak zones, shear zones, natural caves, and water-bearing strata along the twin tunnel alignments for the safe launching of two Tunnel Boring Machines (TBMs) named Shiva and Shakti. M/s L&T /RVNL implemented the TSP investigation at two strategic locations inside the large semi-underground railway station junction for the Up and Down line tunnels. The necessity to evaluate TSP's efficacy in assessing geo-hydrological conditions, bonding, rupturing, and other geological features prompted a comparison with other investigation methods used within 100 meters from both tunnel faces (CH: 48+180m and RD857m). TSP method results were compared with engineering geological predictions and estimated geological cross-sections, revealing that TSP effectively detects varying rock mass zones in the Himalayan geology. However there was no direct relationship in between wave velocities (Vp and Vs) and the Q & RMR values, a linear regression analysis highlighted the potential of TSP in identifying hard, medium, and soft weak zones of rock mass. Additionally, comparisons with Measurement While Drilling (MWD) results indicated that TSP and MWD could complement each other, identifying weak zones where one method might not detect them. The complex geology of Package-4, with its varying rock mass quality (RMR ranges 39-49 and 36-43 for the Up and Down line tunnels, respectively), suggests that TSP technology is well-suited for such challenging geological conditions. The findings underscore the importance of incorporating TSP for ensuring safety and precision in tunnel boring operations in the Himalayan region.
Article Details
Unique Paper ID: 167009

Publication Volume & Issue: Volume 11, Issue 3

Page(s): 59 - 70
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