TMF Filtration Plant Martabe Gold Location : North Tapanuli, North Sumatera, Indonesia

Project Details

SYSTEM

MSE – TA Walls

Reinforced Earth®
Wall / MSE Wall

Back-to-back MSE
Wall

OWNER

PT. Agincourt
Resources

CONTRACTOR

PT. Anggun Permai
Tekindo

CONSTRUCTION YEAR

10/2022 to
02/2023

DESIGNER + CONSULTANT

  • Reinforced Earth
    (Reinforced
    Earth Indonesia)
  • Ground Risk
    Management

Background

New development of TMF Filtration Plant is planned on sloping rocky slope. Existing site has insufficient area for whole plant development.

Additional fills are needed to widen area for plant development.

MSE Wall is proposed by GRM as the retaining system for the additional area.

Part of proposed TMF Filtration Plant is planned as a storage of filter cake area. This storage structure is located near MSE Wall.

Rencana pembangunan Pabrik Filtrasi TMF direncanakan di lereng berbatu yang curam. Lokasi rencana pabrik tidak memiliki lahan yang cukup luas untuk membangun pabrik secara keseluruhan.

Penambahan timbunan diperlukan untuk memperluas area untuk pembangunan pabrik.

Dinding MSE diusulkan oleh GRM sebagai sistem penahan tanah pada area timbunan.

Sebagian area Pabrik Filtrasi TMF akan direncanakan sebagai area penyimpanan Filter Cake. Area ini akan berada di dekat dinding MSE.

Challenge

Foundation soils under MSE Wall varies in the elevation and consistency. Part of MSE Wall is constructed on competent layer (Rock; SPT-N > 50).

Filter cake storage is designed using cantilever wall along with shear key.

Due to the scarcity of granular material, sand material is used as the technical backfill material.

Tanah pondasi di bawah Dinding MSE bervariasi dalam hal elevasi dan konsistensi. Sebagian Dinding MSE dibangun di atas lapisan yang kompeten (Batuan; SPT-N > 50).

Tempat penyimpanan Filter Cake dirancang menggunakan dinding kantilever yang memiliki elemen penahan geser.

Karena kelangkaan material granular, material pasir digunakan sebagai material timbunan di zona perkuatan

Solution

ReCo designs MSE Wall using Reinforced Earth® Wall specification. Total facia of Reinforced Earth® Wall is 1,237 m2.

Under filter cake storage, Reinforced Earth® Wall is designed with higher tensile strength of reinforcement to accommodate Filter Cake high load. In addition, Back-to-back MSE Wall is designed as retaining earth wall in front of Filter cake stockpile structure.

In the reinforcement zone, combination of Geosynthetic GeoStrap® and Geogrid are proposed to minimize wall lateral deflection due to sandy type backfill material.

ReCo mendesain Dinding MSE menggunakan spesifikasi Dinding Reinforced Earth®. Total luas facia (muka) MSE TA Wall adalah 1.237 m2.

Di bawah struktur penyimpanan Filter Cake, Dinding Reinforced Earth® didesain dengan perkuatan yang lebih tinggi untuk mengakomodasi beban Filter Cake yang besar. Selain itu, Dinding Reinforced Earth® juga didesain Back-to-back sebagai dinding tanah penahan di depan struktur penyimpanan Filter Cake.

Di dalam zona perkuatan, kombinasi Geosynthetic GeoStrap® dan Geogrid diusulkan untuk meminimalkan defleksi lateral dinding karena material timbunannya berupa pasir.

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