Lesotho Highlands Water Project - Construction of Polihali Diversion Tunnels

Structures Analyzed with Dlubal Software

  • Customer Project

Customer Project

02/10/2022

001229

Lesotho

RFEM

RFEM 5

The Lesotho Highlands Water Project is a multi-phase binational project carried out by the Kingdom of Lesotho together with the Republic of South Africa.

Owner Lesotho Highlands Development Authority (LHDA)
Planning Metsi a Senqu-Khubelu Consultants (MSKC)
Joint venture between Zutari, Knight Piesold, Hatch, SMEC, and FM Associates
Construction SCLC Polihali Diversion Tunnel Joint Venture
Joint venture of the South African branches of CMC di Ravenna, Salini Impregilo, CMI Infrastructure, and Lesotho-based LSP Construction

Inlet Structure Model Parameters

Model

This project aims at harnessing the water resources of the Lesotho highlands by building numerous dams and tunnels. Phase II includes the construction of a dam, transfer tunnel, and associated infrastructure. The Polihali diversion tunnels were initially set up as part of a construction contract to allow for early river diversion in the main Polihali Dam contract.

Dlubal customer Zutari (Pty) Ltd. carried out, among other things, structural analysis of the reinforced concrete inlet structures. Zutari's engineers utilized the RFEM finite element program.

Structure

An optimal solution was developed, including two D-shaped tunnels with diameters of 22.97 ft and 29.53 ft, respectively, and lengths of approximately 0.62 mi each. The tunnels are provided with inlet structures made of reinforced concrete and equipped with stoplog guides, transitioning from a rectangular section to a circular section.

Further transition to the D-shape of the tunnel was constructed using a combination of mass concrete and shotcrete.
The tunnels were excavated using a drill and blast method, full-face, and lined with shotcrete and mesh.

Project Location

Mokhotlong, Lesotho

Keywords

Tunnel Reinforced concrete Inlet Structure

Write Comment...

Write Comment...

  • Views 689x
  • Updated 04/27/2022

Contact Us

Contact Dlubal

Do you have further questions or need advice? Contact us via phone, email, chat, or forum, or find suggested solutions and useful tips on our FAQ page, available 24/7.

(267) 702-2815

[email protected]

Glass Design with Dlubal Software

Glass Design with Dlubal Software

Webinar 06/08/2021 2:00 PM - 2:45 PM CEST

Blast Time History Analysis in RFEM

Blast Time History Analysis in RFEM

Webinar 05/13/2021 2:00 PM - 3:00 PM EST

Timber Structures | Part 2: Design

Timber Beam and Surface Structures | Part 2: Design

Webinar 05/11/2021 2:00 PM - 3:00 PM CEST

Plate and Shell Buckling Utilizing Dlubal Software

Plate and Shell Buckling Utilizing Dlubal Software

Webinar 03/30/2021 2:00 PM - 2:45 PM CEST

CSA S16:19 Steel Design in RFEM

CSA S16:19 Steel Design in RFEM

Webinar 03/10/2021 2:00 PM - 3:00 PM EST

The Most Common User Errors With RFEM and RSTAB

The Most Common User Errors With RFEM and RSTAB

Webinar 02/04/2021 2:00 PM - 3:00 PM CET

ADM 2020 Member Design in RFEM

ADM 2020 Member Design in RFEM

Webinar 01/19/2021 2:00 PM - 3:00 PM EST

Dlubal Info Day

Dlubal Info Day Online | December 15, 2020

Webinar 12/15/2020 9:00 AM - 4:00 PM CET

FEA Troubleshooting and Optimization in RFEM

FEA Troubleshooting and Optimization in RFEM

Webinar 11/11/2020 2:00 PM - 3:00 PM EST

Soil-Structure Interaction in RFEM

Soil-Structure Interaction in RFEM

Webinar 10/27/2020 2:00 PM - 2:45 PM CET

NBC 2015 Modal Response Spectrum Analysis in RFEM

NBC 2015 Modal Response Spectrum Analysis in RFEM

Webinar 09/30/2020 2:00 PM - 3:00 PM EST

Documenting Results in the RFEM Printout Report

Webinar 08/25/2020 2:00 PM - 2:45 PM CEST

ACI 318-19 Concrete Design in RFEM

ACI 318-19 Concrete Design in RFEM

Webinar 08/20/2020 2:00 PM - 3:00 PM EST

How to be More Productive Using RFEM

How to Be More Productive Using RFEM

Webinar 07/07/2020 3:00 PM - 4:00 PM CEST

Introduction to Solid Modeling \n in RFEM

Introduction to Solid Modeling in RFEM

Webinar 06/30/2020 2:00 PM - 3:00 PM EST

Modeling with Solids in RFEM

Modeling with Solids in RFEM

Webinar 06/09/2020 3:00 PM - 3:45 PM CEST

CSA A23.3 Concrete Design in RFEM

CSA A23.3:19 Concrete Design in RFEM

Webinar 05/14/2020 2:00 PM - 3:00 PM EST

Programmable COM Interface for RFEM/RSTAB

Programmable COM Interface for RFEM/RSTAB

Webinar 05/12/2020 3:00 PM - 3:45 PM CEST