Comparison between Models of Rock Discontinuity Strength and Deformation

Oliveira, David; Indraratna, Buddhima

doi:10.1061/(asce)gt.1943-5606.0000284

Cited by 19 publications

(3 citation statements)

References 10 publications

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“…The terms a 0 , a n , b n e T F are determined by interpolating the dilation vs. shear displacement curve, as obtained by direct shear tests. Indraratna et al (2005Indraratna et al ( , 2010aIndraratna et al ( , 2010b and Oliveira & Indraratna (2010) have shown that the model proposed by Indraratna & Haque (2000) can predict the shear behavior of unfilled rock discontinuities, but they also highlight the difficulties involved in obtaining its parameters because the results of laboratory tests are required and may not be easily available. Note also that the experimental data can only represent the field behavior if the boundary conditions imposed in laboratory tests are the same as those observed in the field, a fact that is not always possible, due to the limitations of the test equipment and the sampling process (Dantas Neto et al, 2017).…”

Section: Practical Application Of the Fuzzy Model In A Rock Slope Stamentioning

confidence: 99%

Predicting the Shear Strength of Unfilled Rock Joints with the First-Order Takagi-Sugeno Fuzzy Approach

Matos¹,

Neto²,

Barreto³

2019

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As a result of a number of studies, some analytical models have been developed to predict the shear behavior of unfilled rock joints, but they all present a purely deterministic nature because their input variables are defined without considering the uncertainties inherent in the formation processes of the rock masses and related discontinuities. This work aims to present a model for predict the shear strength of unfilled rock joints by incorporating uncertainties in the variables that govern its shear behavior with a First-Order Takagi-Sugeno fuzzy controller. The model is developed based on the results of 44 direct shear tests carried out on different types of joints. The model input variables are the normal boundary stiffness and initial normal stress acting on the joint, its roughness (expressed by the JRC value), the uniaxial compressive strength, the basic friction angle of the intact rock and the shear displacement imposed to the joint. The results show that the predicted shear strength of unfilled rock joints obtained by the fuzzy model fits satisfactorily the experimental data and allows the shear behavior of the discontinuities to be defined. A practical application of the model in a stability analysis of a rock mass is also presented.

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Section: Practical Application Of the Fuzzy Model In A Rock Slope Stamentioning

confidence: 99%

Predicting the Shear Strength of Unfilled Rock Joints with the First-Order Takagi-Sugeno Fuzzy Approach

Matos¹,

Neto²,

Barreto³

2019

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“…Compared with the period of design, construction and operation of underground caverns, the excavation period is short but important, and excavation disasters caused by groundwater seepage are common [8,[21][22][23]. During excavation, the potential seepage boundary is formed immediately on the wall of the caverns and drainage system, but the descent of groundwater is a hysteretic result of the water retention capability of soil and rock mass [12,24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Studies on underground cavern excavation have focused on the stability analysis of rock mass [9,[26][27][28][29]. Chen et al [23] and Oliverira and Indraratn [21] investigated the change in rock mass hydraulic conductivity during excavation, but their transient seepage analysis, although important, is still limited [22].…”

Section: Introductionmentioning

confidence: 99%

Transient Seepage Analysis of Qingyuan Power Station Underground Caverns and Drainage Hole Arrays with Excavation Process

Cheng

Jaturapitakkul

2021

Arab J Sci Eng

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The disasters caused by groundwater during underground cavern excavation, are inevitable and difficult to predict. In this study, transient seepage analysis was performed during the excavation of Qingyuan power station's underground caverns and drainage hole arrays. The drainage hole arrays around the caverns were simulated using a new method, and the groundwater surface during transient seepage analysis was confirmed with the hydraulic conductivity adjustment method, by using ABAQUS user subroutines USDFLD and GETVRM. By simplifying the drainage hole into face geometry, the proposed drainage hole simulation method could reach the accuracy of the widely used substructure method with half nodes of the computational boundary, and reflect the influence of drainage hole diameter on seepage analysis results. Moreover, a sensibility analysis of the diameter and space of drainage hole arrays could be conducted using one simulation model with the proposed finite element mesh type. Transient seepage analysis showed the evolutions of the groundwater level, flow rate and maximum hydraulic gradient of drainage holes and underground caverns, during the construction of Qingyuan power station. Such results could provide a reference for the creation of design and construction schemes. The previous excavation of the drainage hole arrays could control the seepage field, and reduce the flow rate and maximum hydraulic gradient of the underground caverns. This study may provide valuable reference to the design and construction of similar projects.

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Effects of Cyclic Loading on the Shear Behaviour of Infilled Rock Joints Under Constant Normal Stiffness Conditions

2013

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Comparison between Models of Rock Discontinuity Strength and Deformation

Cited by 19 publications

References 10 publications

Predicting the Shear Strength of Unfilled Rock Joints with the First-Order Takagi-Sugeno Fuzzy Approach

Predicting the Shear Strength of Unfilled Rock Joints with the First-Order Takagi-Sugeno Fuzzy Approach

Transient Seepage Analysis of Qingyuan Power Station Underground Caverns and Drainage Hole Arrays with Excavation Process

Effects of Cyclic Loading on the Shear Behaviour of Infilled Rock Joints Under Constant Normal Stiffness Conditions

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