In a significant development surrounding the Silkyara-Barkot tunnel project, a geological report submitted to the Ministry of Road Transport and Highways (MoRTH) sheds light on potential challenges, revealing the presence of weak rocks and the imperative need for robust support structures. The comprehensive report posits that the tunnel may encounter varying rock conditions, with 20% deemed good, 50% fair, and 30% falling into the poor to very poor category.
The predominant rocks in the region, identified as weak sedimentary varieties such as slate and siltstone, raise red flags regarding potential wedge formations in the crown and sidewalls during the construction phase. This geological instability is believed to have played a role in the collapse of the under-construction tunnel, leading to the unfortunate entrapment of 41 workers.
As the rescue operation enters its 16th day, the approach has shifted to vertical drilling following unsuccessful attempts with an auger machine. The report underscores the weaker nature of mountain rocks on the Silkyara side compared to the Barkot side, suggesting a plausible “slip circle failure,” a landslide variation carrying inherent risks for tunnel projects.
Geologists advocate for more exhaustive geological studies, questioning the adequacy of the conducted three exploratory drillings. Concerns are raised regarding the construction methodology and adherence to safety guidelines, particularly highlighting the absence of an escape passage in the 4.5 km tunnel.
While authorities defend the project, citing its potential to offer all-weather connectivity and reduce travel time, critics stress the importance of addressing geological intricacies and ensuring strict compliance with safety standards.
The ongoing inquiry committee continues to investigate the tunnel collapse, with the primary focus remaining on the urgent rescue of the trapped workers. The precise cause of the collapse awaits determination as experts navigate the complex geological and construction aspects surrounding this critical infrastructure project.
