Text

DESAIN GEOMETRI LERENG TANAH TIMBUNAN BERDASARKAN KARAKTERISTIK MINERAL, KOHESIVITAS MATERIAL DAN SUDUT KELERENGAN PADA TAMBANG TERBUKA BATUBARA

---

A disposal area is an area where soil and overburden material are accumulated or piled up in an open-pit mining area. The more material removed, the larger the disposal area. PT Bukit Asam (PTBA) is one of the largest and oldest coal mines in South Sumatra. PTBA's disposal area at the Air Laya (TAL) mine is one of the largest dumps, extending up to 80 meters above the original ground. In 2017, the dump, often referred to as the Old Dump (OD), was re-excavated due to the presence of coal deposits beneath it. Limited reserves are certainly the main reason for this embankment excavation. The embankment, composed of loose or residual material, is already in critical condition (prone to landslides) in its undisturbed state, and historically, in 2002, this OD experienced a landslide that damaged telecommunications and electricity networks at that time. Re-excavation of this embankment carries a very high risk due to the nature of the residual and brittle material, thus making the embankment slope even more critical, especially when contaminated with groundwater and/or rainwater. Testing of the material's mechanical properties uses the International Society for Rock Mechanics (ISRM) standard. Clay identification is carried out using the X-ray-fluorescence (XRF) and X-ray Diffraction (XRD) methods to determine the OD mineral composition. For slope stability analysis, the Limit Equilibrium Method (LEM) is used with the help of simulations using Geostudio Slope-W software. Laboratory test results indicate that the presence of montmorillonite minerals can reduce the cohesion value. All rock mass classifications indicate that this embankment material is in the fragile soil class (class V). The geometry ratio of the embankment slope can be optimized to 1:2 with a heterogeneous material approach, namely with a single slope height of 6 meters and an overall slope of 9.5o.

---

Availability

Detail Information

Series Title

-

Call Number

T1924982026

Publisher

Palembang : Prodi Doktor Ilmu Teknik, Fakultas Teknik Universitas Sriwijaya., 2026

Collation

xiv, 124 hlm.; ilus.; tab.; 29 cm.

Language

Indonesia

ISBN/ISSN

-

Classification

622.280 7

Content Type

Text

Media Type

-

Carrier Type

-

Edition

-

Subject(s)

Prodi Doktor Ilmu Teknik
Geoteknik Pertambangan

Specific Detail Info

-

Statement of Responsibility

MI

Other version/related

File Attachment

Comments

---

You must be logged in to post a comment