Nepal Engineering College | Thesis Abstract

All Thesis Abstracts

Determination of Pedestrian Critical Gap and Level of Service at Selected Crosswalks of Unsignalized Intersections in Kathmandu Valley

Rishikesh Shah

Asst. Prof. Rajesh Khadka

Assessment on Delay Factors of Land Pooling Projects in Kathmandu Valley and its Mitigation Strategies

Amrit Kumar Sharma

Assoc. Prof. Raghu Nath Prajapati

Relationship Between Pavement Condition Index and Skid Resistance: A Case Study of Selected Flexible Pavement Road Sections.

Kumod Prasad Bhatta

Asst.Prof Gopal Gautam

Assessment of Labour Informality in Residential Housing Construction Projects in Kathmandu District, Nepal

Binaya Lamsal

Dr. Dinesh Sukamani

Alternative Building Materials for Embodied Carbon Reduction with Implementation challenges: A Case Study of Dakshinkali Municipality

Suraj Giri

Assoc. Prof. Robert Dongol & Dr. Dinesh Sukamani

An assessment of drivers perception and speed performance of vehicles on W-Beam crash barrier: a case study of Chakchake- Bhingri road section, Pyuthan.

Shashikiran Khadka

Asst.Prof Gopal Gautam

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