STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD

Rock mass at depth is subjected to in situ stresses. Based on its orientation, in situ stresses are divided into vertical stress and horizontal stress (σv and σh). These stresses are not always possessing same value and will turn into induced stresses when tunnels are excavated. Th...

Full description

Saved in:
Bibliographic Details
Main Author: Mochamad Hambali (NIM : 12112076), Irham
Format: Final Project
Language:Indonesia
Online Access:https://digilib.itb.ac.id/gdl/view/28128
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Institut Teknologi Bandung
Language: Indonesia
id id-itb.:28128
spelling id-itb.:281282018-10-02T10:38:33ZSTUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD Mochamad Hambali (NIM : 12112076), Irham Indonesia Final Project INSTITUT TEKNOLOGI BANDUNG https://digilib.itb.ac.id/gdl/view/28128 Rock mass at depth is subjected to in situ stresses. Based on its orientation, in situ stresses are divided into vertical stress and horizontal stress (&#963;v and &#963;h). These stresses are not always possessing same value and will turn into induced stresses when tunnels are excavated. These things may cause underground instability if monitoring activities are not carried out. Besides observing physical condition of tunnels, underground stability can be predicted by using Finite Element Method. <br /> <br /> This research allows RS3 2.0 software to construct beam rock mass model with specific dimension such as 150x100x150 m. Rock mass model loaded with different in situ stresses ratio, which are 1:1:1; 1:1:2; and 1:2:1. In each model, a horseshoe shaped underground powerhouse also constructed with specific width of 18 m, height of 32 m and a final excavation length done until it reach 70 m. Displacement, induced stress, rock mass characteristic curve, and Safety Factor transformation are being observed at point 40 m for each tunnel advancing stage. <br /> <br /> From this experiment, largest roof displacement obtained from 1:1:1 and 1:2:1 ratio which is 1,15 cm and 1,13 cm. Meanwhile largest wall displacement obtained from 1:1:2 ratio which has value 5,4 cm. Induced stress from &#963;v: &#963;h1: &#963;h2 = 1: 1: 1 ratio is safer on the roof, right wall, and the left wall of the underground powerhouse because it produces smallest &#963;1 compared to the other loading ratio. Excavation progress will affect the decrease of internal support pressure (Pi). Along with the decrease in Pi for each excavation progress, the displacement formed will also increase. The value of SF on the roof is stable because all ratios have SF>1 for each stage of excavation. Meanwhile, the wall that have SF<1 with the lowest SF value is 0,67 obtained from &#963;v: &#963;h1: &#963;h2 = 1: 2: 1 ratio on the right wall. text
institution Institut Teknologi Bandung
building Institut Teknologi Bandung Library
continent Asia
country Indonesia
Indonesia
content_provider Institut Teknologi Bandung
collection Digital ITB
language Indonesia
description Rock mass at depth is subjected to in situ stresses. Based on its orientation, in situ stresses are divided into vertical stress and horizontal stress (&#963;v and &#963;h). These stresses are not always possessing same value and will turn into induced stresses when tunnels are excavated. These things may cause underground instability if monitoring activities are not carried out. Besides observing physical condition of tunnels, underground stability can be predicted by using Finite Element Method. <br /> <br /> This research allows RS3 2.0 software to construct beam rock mass model with specific dimension such as 150x100x150 m. Rock mass model loaded with different in situ stresses ratio, which are 1:1:1; 1:1:2; and 1:2:1. In each model, a horseshoe shaped underground powerhouse also constructed with specific width of 18 m, height of 32 m and a final excavation length done until it reach 70 m. Displacement, induced stress, rock mass characteristic curve, and Safety Factor transformation are being observed at point 40 m for each tunnel advancing stage. <br /> <br /> From this experiment, largest roof displacement obtained from 1:1:1 and 1:2:1 ratio which is 1,15 cm and 1,13 cm. Meanwhile largest wall displacement obtained from 1:1:2 ratio which has value 5,4 cm. Induced stress from &#963;v: &#963;h1: &#963;h2 = 1: 1: 1 ratio is safer on the roof, right wall, and the left wall of the underground powerhouse because it produces smallest &#963;1 compared to the other loading ratio. Excavation progress will affect the decrease of internal support pressure (Pi). Along with the decrease in Pi for each excavation progress, the displacement formed will also increase. The value of SF on the roof is stable because all ratios have SF>1 for each stage of excavation. Meanwhile, the wall that have SF<1 with the lowest SF value is 0,67 obtained from &#963;v: &#963;h1: &#963;h2 = 1: 2: 1 ratio on the right wall.
format Final Project
author Mochamad Hambali (NIM : 12112076), Irham
spellingShingle Mochamad Hambali (NIM : 12112076), Irham
STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD
author_facet Mochamad Hambali (NIM : 12112076), Irham
author_sort Mochamad Hambali (NIM : 12112076), Irham
title STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD
title_short STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD
title_full STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD
title_fullStr STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD
title_full_unstemmed STUDY OF IN SITU STRESS RATIO IMPACTS AGAINST DISPLACEMENT AND INDUCED STRESS ALONG UNDERGROUND POWERHOUSE EXCAVATION USING FINITE ELEMENT METHOD
title_sort study of in situ stress ratio impacts against displacement and induced stress along underground powerhouse excavation using finite element method
url https://digilib.itb.ac.id/gdl/view/28128
_version_ 1821994974147772416