Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia

The objective of this research is to evaluate the stability of the natural slopes at the inlet and outlet portals of the Bolangu Ulu diversion tunnel, Gorontalo. The natural slopes were considered stable, and therefore slope stability analyses were not carried out previously in the tunnel portal des...

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Autores principales:	Luden Alesandro Sejo, Indrawan I Gde Budi, Karnawati Dwikorita
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/bad4250d192c48349a1fdc3775de6236
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spelling	oai:doaj.org-article:bad4250d192c48349a1fdc3775de62362021-12-02T17:11:56ZSlope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia2267-124210.1051/e3sconf/202132501015https://doaj.org/article/bad4250d192c48349a1fdc3775de62362021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/101/e3sconf_icst2021_01015.pdfhttps://doaj.org/toc/2267-1242The objective of this research is to evaluate the stability of the natural slopes at the inlet and outlet portals of the Bolangu Ulu diversion tunnel, Gorontalo. The natural slopes were considered stable, and therefore slope stability analyses were not carried out previously in the tunnel portal design. The slope stability analyses were carried out using the Circular Failure Chart (CFC) and Limit Equilibrium Methods (LEM). Input data for the slope stability analyses were obtained from field mapping and laboratory testing of soil and rock samples. The results show that the portal slopes consist of diorite and residual soil. Both stability analysis methods yield nearly the same results. The slope at the outlet section had the factor of safety (FOS) values of 1.29 and 1.30 based on the CFC method and LEM, respectively, indicating the slope in a stable condition. However, the slope at the inlet section had the FOS values of 1.01 and 1.07 based on the CFC method and LEM, respectively, indicating the slope in a critical condition. The results suggest that stabilization of the portal slopes, particularly the portal slope at the inlet section, is required to prevent slope failures under static and earthquake loads.Luden Alesandro SejoIndrawan I Gde BudiKarnawati DwikoritaEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 325, p 01015 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Luden Alesandro Sejo Indrawan I Gde Budi Karnawati Dwikorita Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia
description	The objective of this research is to evaluate the stability of the natural slopes at the inlet and outlet portals of the Bolangu Ulu diversion tunnel, Gorontalo. The natural slopes were considered stable, and therefore slope stability analyses were not carried out previously in the tunnel portal design. The slope stability analyses were carried out using the Circular Failure Chart (CFC) and Limit Equilibrium Methods (LEM). Input data for the slope stability analyses were obtained from field mapping and laboratory testing of soil and rock samples. The results show that the portal slopes consist of diorite and residual soil. Both stability analysis methods yield nearly the same results. The slope at the outlet section had the factor of safety (FOS) values of 1.29 and 1.30 based on the CFC method and LEM, respectively, indicating the slope in a stable condition. However, the slope at the inlet section had the FOS values of 1.01 and 1.07 based on the CFC method and LEM, respectively, indicating the slope in a critical condition. The results suggest that stabilization of the portal slopes, particularly the portal slope at the inlet section, is required to prevent slope failures under static and earthquake loads.
format	article
author	Luden Alesandro Sejo Indrawan I Gde Budi Karnawati Dwikorita
author_facet	Luden Alesandro Sejo Indrawan I Gde Budi Karnawati Dwikorita
author_sort	Luden Alesandro Sejo
title	Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia
title_short	Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia
title_full	Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia
title_fullStr	Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia
title_full_unstemmed	Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia
title_sort	slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of bolango ulu dam, indonesia
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/bad4250d192c48349a1fdc3775de6236
work_keys_str_mv	AT ludenalesandrosejo slopestabilityanalysesbycircularfailurechartandlimitequilibriummethodstheinletandoutletofdiversiontunnelofbolangouludamindonesia AT indrawanigdebudi slopestabilityanalysesbycircularfailurechartandlimitequilibriummethodstheinletandoutletofdiversiontunnelofbolangouludamindonesia AT karnawatidwikorita slopestabilityanalysesbycircularfailurechartandlimitequilibriummethodstheinletandoutletofdiversiontunnelofbolangouludamindonesia
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Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia

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