scholarly journals Weak rock mass characterization for determination of support system of the DK99-DK100 Jakarta – Bandung speed railway tunnel, Indonesia

2021 ◽  
Vol 871 (1) ◽  
pp. 012060
Author(s):  
L Ali ◽  
I G B Indrawan ◽  
Hendarto
Keyword(s):  
Rock Mass ◽  
Support System ◽  
Weak Rock ◽  
Railway Tunnel ◽  
Rock Mass Characterization ◽  
Weak Rock Mass

Reliability Analysis of Railway Tunnel Construction Process within Soft and Weak Rock Mass Using the Unified Elasto-Plastic Strength Criterion

2007 ◽  
Vol 353-358 ◽  
pp. 2521-2524
Author(s):  
Jun Ying Lian ◽  
Tai Quan Zhou ◽  
Yuan Hua ◽  
Guo Liang Dai
Keyword(s):  
Finite Element Analysis ◽  
Rock Mass ◽  
Reliability Analysis ◽  
Strength Criterion ◽  
Nonlinear Finite Element ◽  
Weak Rock ◽  
Railway Tunnel ◽  
Element Analysis ◽  
Plastic Strength ◽  
Weak Rock Mass

Variability in the physical properties of rock mass is a major source of uncertainty encountered in railway tunnel stability analysis. The conventional safety factor method on stability assessment of railway tunnel within soft and weak rock mass can not represent the variability of rock mass. A formulation to compute the reliability of soft and weak rock mass, in which physical non-linearity is taken into account, is proposed. To consider the intermediate principal stress effect on the rock mass strength, the unified elasto-plastic strength criterion is proposed in the nonlinear finite element analysis. The unified rock mass elasto-plastic material model is implemented in ABAQUS user interface. The reliability analysis is performed in two steps. Firstly, the failure response is obtained by fitting the limit state function of the rock mass using the quadratic polynomial based on the nonlinear finite element analysis of the rock mass. Secondly, the JC method is proposed to obtain the design point and the reliability index of rock mass. As a case for study, the reliability analysis of Jinhuashan railway tunnel within soft and weak rock mass is studied using the proposed method. The two dimensional analysis is performed to consider the excavation stage effect and the unloading effect on the rock mass. Computation result shows that the rock mass is in stability.

scholarly journals Review of Current Empirical Approaches for Determination of the Weak Rock Mass Properties

2017 ◽  
Vol 191 ◽  
pp. 908-917
Author(s):  
Hao Zhai ◽  
Ismet Canbulat ◽  
Bruce Hebblewhite ◽  
Chengguo Zhang
Keyword(s):  
Rock Mass ◽  
Weak Rock ◽  
Rock Mass Properties ◽  
Mass Properties ◽  
Weak Rock Mass ◽  
Empirical Approaches

scholarly journals An analysis on the slaking and disintegration extent of weak rock mass of the water tunnels for hydropower project using modified slake durability test

2019 ◽  
Vol 79 (4) ◽  
pp. 1919-1937 ◽  
Author(s):  
Lena Selen ◽  
Krishna Kanta Panthi ◽  
Gunnar Vistnes
Keyword(s):  
Rock Mass ◽  
Test Method ◽  
Weak Rock ◽  
Hydropower Project ◽  
Durability Test ◽  
Slake Durability ◽  
Operational Life ◽  
Heterogeneous Rock ◽  
Weak Rock Mass ◽  
Slake Durability Test

AbstractWater tunnels built for hydropower passing through weak and heterogeneous rock mass pose challenges associated to slaking and disintegration, as they are first exposed to dry condition during excavation and are then filled with water to produce hydropower energy. Over the period of operational life, these tunnels are drained periodically for inspections and repair leading to drainage and filling cycles. The weakening of rock mass caused by cycles of drying, saturation and drainage may lead to the propagation of instabilities in the tunnels. Therefore, it is important to study the slaking and disintegration behavior of the weak rock mass consisting of clay and clay-like minerals. This paper assesses the mineralogical composition of flysch and serpentinite from the headrace tunnel of Moglicë Hydropower Project in Albania. Further, to determine the slaking and disintegration behavior of these rocks, extensive testing using both the ISRM, Int J Rock Mech Min Sci Geomech Abstr 16(2):143-151, (1979) suggested test method and a modified variant of this test are performed. Finally, comprehensive assessments, discussions and comparisons are made. It is found that the modified slake durability test better suits for the tunnels built as water conveying systems such as hydropower tunnels.

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