Text

ANALISIS KESTABILAN TUNNEL MENGGUNAKAN METODE ROCK TUNELLING QUALITY INDEX (Q-SYSTEM) DI PT. ALLIED INDO COAL JAYA, KOTA SAWAHLUNTO, SUMATERA BARAT

---

Penilaian

---

Research conducted at PT. Allied Indo Coal Jaya, City of Sawahlunto with open pit mining and underground mining. Underground mining is synonymous with subsidence risk caused by reduced soil carrying capacity due to excavation. The potential for instability around underground mine openings requires special handling, especially the issue of safety factors and buffer planning to ensure worker safety. The research focuses on analyzing the stability of underground mine openings using the Rockling Quality Index (Q-System) method. The research method used is a qualitative analysis method in the form of interpretation and quantitative analysis on joint data in the field and rock properties data in the laboratory. This research was conducted on the in Seam B with a total of 5 tunnels and seam C with a total of 4 tunnels. The data obtained is in the form of direct data from the field, namely joint data using the scanline method and sampling which is then analyzed in the laboratory. From the data obtained from the analysis results, Seam B Coal and Seam C Coal are classified as poor rock types, while sandstone and siltstone layers are classified as fair rock types. The maximum span value obtained at the study site which was measured according to the length of the 15 meter scanline was obtained for Seam B from 6-6.5 meters while Seam C was from 6-7.2 meters so that each had to be supported. In the identification of the supports without shotcrete, it was found that for the entire tunnel, rockbolts were installed 2.5 meters long with the distance between the rockbolts for each being 1.35 meters except for 2 1.37 meters, 6 1.34 meters, 9 1 .40 meters. The stress value (meanstress) after the support system has increased is in Seam B, which is 0.5-1. While the for the opening hole is by the equation, it is obtained that the value needs to be carried out so that the support system becomes stable (> 1.25) with the results on Seam B 7 from 0.84 to 1.46 (stable ), 1 from 0.83 to 1.43 (stable), 2 from 1.04 to 1.46 (stable), 5 from 1.04 to 1.46 (stable), 6 from 1.04 to 1.59 (stable) while in Seam C 3 from 0.84 to 1.63 (stable), 4 from 0.81 to 1.73 (stable), 9 from 1.4 to 2.25 ( stable), and Main Shaft from 1.27 to 1.89 (stable). Keywords : Q-System, Stability, Buffer, Tunnel, Strength Factor

---

Availability

Inventory Code	Barcode	Call Number	Location	Status
2307000343	T89058	T890582023	Central Library (Referens)	Available but not for loan - Not for Loan

Detail Information

Series Title

-

Call Number

T890582023

Publisher

Inderalaya : Prodi Teknik Geologi, Fakultas Teknik Universitas Sriwijaya., 2023

Collation

xiii, 112 hlm.; ilus.; 29 cm

Language

Indonesia

ISBN/ISSN

-

Classification

552.507

Content Type

-

Media Type

-

Carrier Type

-

Edition

-

Subject(s)

Batuan Sedimen
Prodi Teknik Geologi

Specific Detail Info

-

Statement of Responsibility

SEPTA

Other version/related

File Attachment

Comments

---

You must be logged in to post a comment