scholarly journals Determination of Segari Rock Slope Excavation Technique using Geological Strength Index (GSI)

2018 ◽  
Vol 7 (4.35) ◽  
pp. 819
Author(s):  
R Roslan ◽  
RC Omar ◽  
I.N.Z. Baharuddin ◽  
Hairin Taha ◽  
M.M. Fared ◽  
...  
Keyword(s):  
Rock Slope ◽  
Deformation Modulus ◽  
Point Load ◽  
Engineering Properties ◽  
Geological Strength Index ◽  
Strength Index ◽  
Slope Excavation ◽  
Grade Ii

Segari - Ayer Tawar rock materials were generally characterized as slightly weathered (Grade II) to moderately weathered (Grade III).  Laboratory tests such as Brazilian tensile strength and point load strength index including direct shear strength were carried out using collected weathering sample from borehole to assess the rock strength. Hence, index testing was used to predict geological strength index, rock failure criterion from Hoek-Brown and deformation modulus mainly for the classification of rock mass engineering properties.  The relationship between the uniaxial compressive strength and geological strength index of rocks were used in proposing suitable methods for cutting the rock slope.

EFFECT OF WET TROPICAL WEATHERING ON THE STRENGTH OF SANDSTONE

2015 ◽  
Vol 76 (2) ◽  
Author(s):  
Edy Tonnizam Mohamad ◽  
Maybelle Liang ◽  
Nurmunirah Mohd Akhair
Keyword(s):  
Moisture Content ◽  
Moisture Absorption ◽  
Initial Moisture Content ◽  
Point Load ◽  
Engineering Properties ◽  
Strength Index ◽  
Tropical Weathering ◽  
Load Tests ◽  
Grade Ii ◽  
Weathering Grades

 The influence of moisture content to the strength of wet tropically weathered sandstone of Jurong Formation found in Nusajaya, Johor was studied. The rock materials have been affected by weathering action; hence the alteration of its engineering properties is incontestable due to these effects. A total of 36 samples representing various weathering grades were collected from the field and tested at various moisture content by immersing them in water at different duration of time, ranging from 15, 30 and 60 minutes. Point load tests for the determination of the strength index Is(50) of the rock were then carried out. For weathered sandstone (Grade II to IV), the mean initial moisture content ranges from 0.15% to 11.00% respectively, while the initial mean strength index has maximum and minimum values of 7.76 MPa and 0.38 MPa. The results reveal that there is a significant relationship between the weathering grades, moisture absorption and strength. The moisture absorption is dependent on the amount of clay minerals present in the rock material, which indirectly affects the strength, as observed with the increment of weathering state. In conclusion, this study indicates that sandstone with higher moisture content and increase in weathering grade exhibits lower strength values. 

Semiautomatic Determination of the Geological Strength Index Using SfM and ANN Techniques

2021 ◽  
Vol 21 (12) ◽  
Author(s):  
Marilia Abrão Zeni ◽  
Rodrigo de Lemos Peroni ◽  
Fábio Augusto Guidotti dos Santos
Keyword(s):  
Geological Strength Index ◽  
Strength Index

scholarly journals Analysis of engineering geology conditions based on the quality of rock mass in the Tiga Dihaji Dam’s diversion tunnel, South Sumatera, Indonesia

2021 ◽  
Vol 325 ◽  
pp. 05001
Author(s):  
Zekrinaldi ◽  
Ferian Anggara ◽  
Hendy Setiawan
Keyword(s):  
Rock Mass ◽  
Geological Strength Index ◽  
Strength Index ◽  
Diversion Tunnel ◽  
Rock Mass Quality ◽  
Geological Conditions ◽  
Q System

This research has examined the rock mass quality case study in the Tiga Dihaji Dam’s diversion tunnel. Observations of geological conditions were carried out on the surface and subsurface of the study site and show that the study area consists of tuffaceous sandstone and carbonate interbeds. The method of this study is based on the classification of the Geological Strength Index (GSI), Rock Mass Rating (RMR), and the Q-system. The results indicate that tuffaceous sandstone has a GSI value of 15 - 87.5 (very poor - very good), RMR 48 - 82 (fair - very good), and Q-system 0.01 – 60.0 (exceptionally poor - very good). Meanwhile, carbonate interbeds have a low value, with a GSI value of 10.5 - 77.5 (very poor to very good), RMR 17.0 – 56.0 (very - poor fair), and Q-system 0 - 35.2 (exceptionally poor - good). Moreover, a correlation was made between rock mass quality for conditions in the study area. The correlation between GSI and RMR was obtained by the equation GSI = 2.2885RMR 82.567 (R2 = 0.6653), RMR and Q-system RMR = 2.0175ln(Q) + 63.061 (R2 = 0.4987), and GSI and Q-system GSI = 7.2119ln(Q) 54.578 (R2 = 0.8095).

scholarly journals Rock slope stability analysis by approximation of geological strength index and finite element method

2019 ◽  
Vol 276 ◽  
pp. 05007
Author(s):  
Soewignjo Agus Nugroho ◽  
Muhamad Yusa ◽  
Andarsin Ongko
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Slope ◽  
Disaster Mitigation ◽  
Geological Strength Index ◽  
Rock Slopes ◽  
Strength Index ◽  
Rock Materials ◽  
The Stability ◽  
Element Method

As a part of natural geography systems, rock slopes have treasured amount of natural resources potential. The rock materials could be utilized to fulfill several needs, especially to construct buildings. However, society sometimes have taken advantages from the slope’s existence in wrong ways. The exploitations toward rock materials, either through manual or modern way (blasting) have caused some cracks occurred. These cracks have reduced the stability of rock slopes and easily triggered failures on rock slopes. In this paper, the stability of a rock slope will be precisely discussed by using Geological Strength Index (GSI) and was analyzed by using finite element method. The rock samples were taken from Pangkalan (West Sumatera, Indonesia), which this location is also vulnerable to rock slope failures. Geological Strength Index was obtained by doing manual observations on rock sample’s properties, i.e. joint, cracks, and discontinuity. The result was consisted of rock’s properties. Meanwhile, the analysis by using finite element method produced an outcome in form of safety factor. This result could be made as a reference for pre-disaster mitigation in Pangkalan.

scholarly journals Review of the Geological Strength Index (GSI) as an Empirical Classification and Rock Mass Property Estimation Tool: Origination, Modifications, Applications, and Limitations

2020 ◽  
Vol 2020 ◽  
pp. 1-18 ◽  
Author(s):  
Sajjad Hussian ◽  
Noor Mohammad ◽  
Zahid Ur Rehman ◽  
Naseer Muhammad Khan ◽  
Khan Shahzada ◽  
...  
Keyword(s):  
Rock Mass ◽  
Quantitative Estimation ◽  
Deformation Modulus ◽  
Evaluation Process ◽  
Jointed Rock ◽  
Strength Properties ◽  
Geological Strength Index ◽  
Strength Index ◽  
Engineering Structures ◽  
Geomechanical Properties

The geological strength index (GSI) is one of the most exceptional rock mass classification system which is used to evaluate very weak and highly jointed rock mass by different approaches and related to rock mass geomechanical properties including generalized Hoek & Brown constants, deformation modulus, strength properties, and Poisson’s ratio for an appropriate design of tunnels, caverns, and other engineering structures. The distinctiveness of this system over the rock mass rating (RMR), Q-system, and other empirical methods is as follows: it utilized field observations, blockiness of rock mass, and surface joint characteristics during the evaluation process of rock mass and efficiently espoused as an empirical tool for estimation of geomechanical properties of rock mass required for pre-post stability of engineering structures using numerical modeling. This study presents the review of the 19 years of research studies conducted by different researchers about the GSI in a systematic way, i.e., origination, modifications, applications, and limitations. Furthermore, this study will provide a better understanding to field professionals (geologists, mining and civil engineers) about the qualitative and quantitative estimation of the GSI and its application as an empirical estimating tool for an appropriate design of engineering structures in rock mass environments.

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