Development of a multivariate empirical model for predicting weak rock mass modulus

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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Early Stage Tunnel Lining Experimental Study of Jinhuashan Railway Tunnel Construction within Soft and Weak Rock Mass

Geological Engineering: Proceedings of the 1 ◽

10.1115/1.802922.paper153 ◽

2010 ◽

pp. 1-8

Author(s):

Hua Yuan ◽

Zhou Taiquan ◽

Lv Baohua

Keyword(s):

Experimental Study ◽

Rock Mass ◽

Early Stage ◽

Tunnel Lining ◽

Tunnel Construction ◽

Weak Rock ◽

Railway Tunnel ◽

Weak Rock Mass

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Automatic Drilling Process Monitoring (DPM) for in-situ characterization of weak rock mass strength with depth

Rock Mechanics: Meeting Society's Challenges and Demands ◽

10.1201/noe0415444019-c25 ◽

2007 ◽

pp. 199-206 ◽

Cited By ~ 1

Author(s):

Z Yue ◽

J Chen ◽

W Gao

Keyword(s):

Rock Mass ◽

Process Monitoring ◽

Weak Rock ◽

Drilling Process ◽

In Situ Characterization ◽

Rock Mass Strength ◽

Weak Rock Mass

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Study on Center Hole Deformation Test of Rigid Bearing Plate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.33-37.1187 ◽

2008 ◽

Vol 33-37 ◽

pp. 1187-1194

Author(s):

Jian Guo Zhang ◽

Qiang Yong Zhang ◽

Wen Dong Yang ◽

Ying Zhang

Keyword(s):

Rock Mass ◽

Deformation Modulus ◽

Hydropower Station ◽

Weak Rock ◽

Bearing Plate ◽

Deep Rock ◽

Weak Rock Mass ◽

Deformation Test ◽

Test Points ◽

Dagangshan Hydropower Station

The center hole deformation test of rigid bearing plate is an important method for understanding deformation properties of deep weak rock mass. According to the center hole deformation test of rigid bearing plate in dam zone of Dagangshan hydropower station, this paper detailedly recommends test method of this experiment, and the settlement deformation formula of deep rock mass under circular rigid bearing plate is deduced, which could be used to calculate deformation modulus and equivalence deformation modulus of different deep rock mass at test points. According to curves of depth-deformation under different pressures at test points in dam zone, we have analyzed deformation characteristics of deep weak rock mass. By the center hole deformation test of rigid bearing plate, stratum properties in dam zone of Dagangshan hydropower station could be understood further, and it provides important references for the study of creep speciality of weak rock mass in dam zone.

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