Salt-mudstones and rock-salt suitabilities for radioactive-waste storage systems: rheological properties

Ślizowski, J.; Lankof, Leszek

doi:10.1016/s0306-2619(03)00026-6

Cited by 37 publications

(10 citation statements)

References 1 publication

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“…The strength of the glauberite salt rock decreased from 46 to 11 MPa, about 25% of the original value. In regards to the strength of the intact specimen, it is larger than that of halite, ∼25-30 MPa and thenardite, ∼15-22 MPa (Slizowski and Lankof 2003;Liang and Zhao 2004;Liu et al 2006), similar to that of some tests performed on anhydrite (∼44-45 MPa) reported by Zhang and Liu (1999).…”

Section: Mechanical Properties Of Glauberite Rocksupporting

confidence: 74%

Dissolution and Seepage Coupling Effect on Transport and Mechanical Properties of Glauberite Salt Rock

Liang

Zhao

et al. 2007

Transp Porous Med

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Potential high rates of aqueous dissolution are characteristic of salt rocks, and solute and mass flux through a soluble porous medium are functions of solute concentration gradients and pressure gradients. Due to different dissolution properties for different mineral components in glauberite salt rock, an interaction between mineral dissolution and solvent seepage arises, driven by the hydraulic pressure gradient in the rock. The originally almost impermeable glauberite rock becomes an increasingly permeable porous medium with dissolution, changing the transport and mechanical properties because of the progressive removal of solid sodium sulfate (Na 2 SO 4 ), one of the constitutive components of glauberite salt rock. Glauberite is often found in bedded salt rock deposits, and the mineral glauberite has economic value and has been mined for many years in China. More economic and safe technologies, such as controlled solution mining, are inherently attractive. Thus, investigations into relevant physical and mechanical properties of glauberite in the context of solution mining have value, and to clarify glauberite behaviour, a series of experiments were performed. It is observed through experiments that the permeability of the rock mass during dissolution of glauberite is a function of the dissolution duration and the hydraulic pressure gradient applied to the system. For example, in laboratory tests, after 49, 53 and 70 h of dissolution, the relationships between permeability (k-cm 2 ) and pressure gradient ( p-MPa across the specimen of length 100 mm) of the glauberite specimens were observed to be k = 0.24 for a p of 0.10, k = 0.30 for a p of 0.12, and k = 0.41 for a p of 0.18, with the empirical functional relationship becoming gradually steeper with pressure. Also, the triaxial compression (mechanical) characteristics of glauberite salt rock change substantially after a period of dissolution: the compressive strength under a confining stress of σ 3 = 2.0 MPa changes initially from 46 to 11 MPa after 70 h of dissolution and seepage. Along with strength degradation, the Young's 123 186 W. Liang et al. modulus (stiffness) changed from 4.6 to 0.5 GPa. Evidently, coupled dissolution and seepage rate greatly impact both transport and mechanical properties of the rock as fabric evolves in a time-dependent manner.

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Section: Mechanical Properties Of Glauberite Rocksupporting

confidence: 74%

Dissolution and Seepage Coupling Effect on Transport and Mechanical Properties of Glauberite Salt Rock

Liang

Zhao

et al. 2007

Transp Porous Med

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“…In this respect, a power-law model has been applied to fit the tertiary creep curves for a series of experiments with different constant applied differential stresses [162,163]. Creep tests have also been carried out on soft rocks such as lignite, tuff, shale, and sandstone, medium-hard rocks such as limestone, marble, and rock salt, and hard rocks such as andesite and granite [153,156,[164][165][166][167][168][169][170]. ese experiments were mostly conducted under uniaxial compression.…”

Section: Rock Damage and Failure Under Rheological Loadmentioning

confidence: 99%

Numerical Simulation on Damage and Failure Mechanism of Rock under Combined Multiple Strain Rates

Zhu

Wei

Niu

et al. 2018

Shock and Vibration

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During underground hard-rock mining, the drilling and blasting method currently remains the most economical excavation method, and the rock may experience a multistrain-rate spectrum under quasi-static, dynamic, and rheological loading conditions and their combination as well. The study on the damage mechanism of rock under multistrain-rate condition that induced by mining excavation is the fundamental issue for predicting the mining-induced hazards such as rockburst. In this study, the state of the art of rock damage and failure under different strain rates is reviewed first. Then, the numerical model for rock failure under multiple strain rates is formulated when the rock damage is taken as the main thread. Meanwhile, we summarize our work in this area over the past ten years, and the constitutive law for the damage and failure of rock under multistrain rates is presented. Finally, several numerical examples, i.e., rock damage and failure under combined static and dynamic load, rock damage and failure triggered by dynamic stress redistribution due to excavation, rock damage and failure induced by blasting, and rock damage and failure due to the combination of dynamic disturbance and rheological load, are presented. Based on these numerical simulations, the associated rock damage mechanism and failure behaviors under differently combined multiple strain rates are clarified, which may provide a theoretical basis for clarifying the rock failure mechanism during rockbursts and rock blasting. Also, further studies on the damage and failure of rock under multiple strain rates are suggested.

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“…Creep experiments are often used to determine the time-dependent strength and time-dependent parameters of rocks . Creep tests have been carried out on soft rocks such as soil or sand (Perzyna 1966 [5]; Lade and Liu 1998 [6]; Zhou et al 2006 [7]), tuff (Akai et al 1984 [8]; Okubo et al 1991Okubo et al , 1993 [9,10]), argillaceous (Fabre and Pellet 2006 [11]), and sandstone (Boukharov et al 1995 [12]), medium-hard rocks such as marble (Liu and Shao 2017 [13]), sandstone (Baud and Meredith 1997 [14]; Heap et al 2009 [15]; Yang and Jiang 2010 [16]), and rock salt (Chan 1997 [17]; Yang et al 1999 [18]; Hunsche and Hampel 1999 [19]; Slizowski and Lankof 2003 [20]; Berest et al 2005 [21]), and hard rocks such as granite (Lomnitz 1956 [22]; Lockner and Byerlee 1977 [23]; Van der Molen and Paterson 1979 [24]; Ito et al 1987 [25]; Masuda et al 1987Masuda et al , 1988 [26,27]), diabase (Yang et al 2014(a, b) [28,29]), and basalt (Heap et al, 2011 [30]).…”

Section: Introductionmentioning

confidence: 99%

Loading History Effect on Creep Deformation of Rock

et al. 2018

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The creep characteristics of rocks are very important for assessing the long-term stability of rock engineering structures. Two loading methods are commonly used in creep tests: single-step loading and multi-step loading. The multi-step loading method avoids the discrete influence of rock specimens on creep deformation and is relatively time-efficient. It has been widely accepted by researchers in the area of creep testing. However, in the process of multi-step loading, later deformation is affected by earlier loading. This is a key problem in considering the effects of loading history. Therefore, we intend to analyze the deformation laws of rock under multi-step loading and propose a method to correct the disturbance of the preceding load. Based on multi-step loading creep tests, the memory effect of creep deformation caused by loading history is discussed in this paper. A time-affected correction method for the creep strains under multi-step loading is proposed. From this correction method, the creep deformation under single-step loading can be estimated by the super-position of creeps obtained by the dissolution of a multistep creep. We compare the time-affected correction method to the coordinate translation method without considering loading history. The results show that the former results are more consistent with the experimental results. The coordinate translation method produces a large error which should be avoided.

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Salt-mudstones and rock-salt suitabilities for radioactive-waste storage systems: rheological properties

Cited by 37 publications

References 1 publication

Dissolution and Seepage Coupling Effect on Transport and Mechanical Properties of Glauberite Salt Rock

Dissolution and Seepage Coupling Effect on Transport and Mechanical Properties of Glauberite Salt Rock

Numerical Simulation on Damage and Failure Mechanism of Rock under Combined Multiple Strain Rates

Loading History Effect on Creep Deformation of Rock

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