Nepal Engineering College | Thesis Abstract

All Thesis Abstracts

Determinants of Green Building Material Adoption: A Mixed-Methods Study of Awareness, Behavioral Intention, and Professional Influence Among Construction Practitioners in Lalitpur, Nepal

Puja Karki

Er. Subash Kumar Bhattarai

Assessment of Factors and Barriers Influencing Safety Training in Hydropower Projects.

Samip K.C.

Asst. Prof. Dinesh Sukamani

Assessment of Obstacles for the Implementation of Hydropower Projects of Different Modes of Generation studied at Various Phases by NEA.

Bishwa Bandhu Bhattarai

Dr. Dinesh Sukamani

Assessment of Delay in Wastewater Treatment Projects Implemented Under Design Build Operate Model in Kathmandu Valley

Prakash K.C.

Assoc. Prof. Hari Mohan Shrestha

Assessment of Non-Revenue Water of Kathmandu Upatyaka Khanepani Limited: -A Case Study of Lalitpur Distribution System

Rabin Khadka

Er. Rabindra Pokharel

Assessment of Mechanical Properties of Concrete Reinforced with Pine Needle Fiber

Prasanna Raj Acharya

Er. Sudip Karanjit

Stability Analysis and Evaluation of Support System of Headrace Tunnel of Dordi Khola Hydro Power Project, Nepal

Student: Kabindra Gautam

Supervisor: Er. Saphal Lamichhane

Submitted Date: December, 2024

Abstract

Predicting and verifying dependable rock mass condition is the primary engineering geological issue for any tunnel. In the high Himalayas, it is difficult to predict rock mass by SRT or ERT methods as the tunnel level is very deep, ie; hundreds of meters below the surface and occasionally even more than 1000 m. The discrepancies between the expected rock mass during the geological investigation and in situ geological conditions encountered cause significant problems and delays. This phenomenon also rises in Dordi Khola Hydropower Project. The general objective of this research is to analyze the stability of the tunnel and evaluate the support system using Finite Element Analysis of Headrace Tunnel of Dordi Khola Hydro Power Project. This study analyzed the stability of the critical sections encountered using various empirical and semi empirical approaches as well as numerical modelling for the selected segments of the headrace tunnel and compare the rock support system designed based on explored geology versus the rock support system estimated using Finite Element Method strategies to be adopted to solve the geological problems encountered. From the Block Stability Analysis of the selected sections in the study, it is observed that the wedges that are formed due to the intersection of discontinuities during the tunnel excavation are stable as they develop sufficient Factor of Safety. Similarly, for the sections in which the deformations are observed during the excavation, that are predicted by empirical and semi analytical approach and the support system that are used at the critical section are insufficient to stabilize the rock mass. Hence, to minimize the further damage of the critical sections, the support system are recommended for revision

Keywords

Rock engineering, deformation, squeezing, rock mass, geological parameters,etc.

THESIS ABSTRACT