Time-dependent deformation behaviors of weak sandstones

Tsai, L. S.; Hsieh, Yu‐Ming; Weng, Meng-Chia; Huang, Tsan‐Hwei; Jeng, Fu‐Shu

doi:10.1016/j.ijrmms.2007.04.008

Cited by 103 publications

(58 citation statements)

References 13 publications

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“…Weak cataclastic rocks are widely used as the host rock medium in various applications of hydraulic engineering, such as dam foundation stability, tunnel support design, and hydraulic fracturing (Habimana et al 2002;Tsai et al 2008;Zhang et al 2013). Cataclastic rocks are a type of sedimentary rock with several fault zones (Elodie and Christopher 2010;Lori and James 2012).…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Behavior of Cataclastic Rocks in a Multi-Loading Triaxial Creep Test

Shao

et al. 2016

Rock Mech Rock Eng

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Section: Introductionmentioning

confidence: 99%

Time-Dependent Behavior of Cataclastic Rocks in a Multi-Loading Triaxial Creep Test

Shao

et al. 2016

Rock Mech Rock Eng

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“…Furthermore, knowledge of the mechanical behavior of sandstone is important in geotechnical engineering (e.g., the design of waste repositories) and in petroleum geoscience (e.g., the prediction of reservoir deformation and fluid flow). For this reason, in the last few decades, many experimental studies have investigated the mechanical behavior of sandstone, including its strength, deformation behavior, failure characteristics and time-dependent behavior (Wong et al 1997;Baud et al 2000;Wu et al 2000;Klein et al 2001;Jeng et al 2002;Bésuelle et al 2003;Fortin et al 2006;Tembe et al 2008;Tsai et al 2008;Zorlu et al 2008;Heap et al 2009a, b;Tavallali and Vervoort 2010;Huang et al 2010;Yang and Jiang 2010;.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Strength, Deformability, Failure Behavior and Acoustic Emission Locations of Red Sandstone Under Triaxial Compression

2012

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Conventional triaxial compression and ''reducing confining pressure'' experiments were carried out for red sandstone by an MTS815 Flex Test GT rock mechanics experimental system. Our results show that the post-peak axial deformation characteristics of red sandstone changed as the confining pressure was increased from 5 to 65 MPa. Young's modulus of red sandstone increased nonlinearly with increasing confining pressure, but Poisson's ratio remained unaffected. Using our new data, the compactive and dilatant behavior, strength and failure characteristics of sandstone under triaxial compression are further discussed. For our data, the nonlinear Hoek-Brown criterion better reflects the peak strength properties than the linear MohrCoulomb criterion. However, the residual strength shows a clear linear relationship with confining pressure, which can be best described using the linear Mohr-Coulomb criterion. The peak and residual strengths were not directly related to the two different loading paths. The onset of dilatancy (C 0 ), the switch from compaction-dominated to dilatant-dominated behavior (D 0 ) and the stress at zero volumetric strain all increased linearly with the confining pressure. In our conventional triaxial compression experiments, the failure mode changed from mixed tension and shear fracture (single shear fracture) to shear fracture with double slippage planes with increasing confining pressure. However, the failure mode in our ''reducing confining pressure'' experiments was more complicated and results mainly from the unstable failure characteristics of the rock during the reduction in confining pressure. Finally, based on our acoustic emission (AE) locations, at a confining pressure of 35 MPa, a detailed analysis of the evolutionary process of internal cracks is presented for the entire loading process.

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“…In addition to simulating immediate rock deformation, the time-dependent deformation (i.e., creep deformation) of rock is a major concern in engineering practice (Cristescu 1989;Hoxha et al 2005;Tomanovic 2006;Xie and Shao 2006;Sterpi and Gioda 2009;Weng et al 2010a, b). According to previous studies on creep deformation of sandstone (Tsai et al 2008;Weng et al 2010a), viscoplastic flows indicate that the viscoplastic potential surface has a similar shape to the plastic potential surface, but the size of the viscoplastic potential surface changes with time. The plastic potential surface has a time-independent size.…”

Section: Introductionmentioning

confidence: 88%

“…According to Jeng et al (2002), Weng et al (2005), and Tsai et al (2008), triaxial results show that the plastic potential surface of sandstone coincides with the yield surface in the prepeak stage. Therefore, the associated flow rule, n ¼ n gL=U and M f ¼ M g , can be used when formulating the constitutive model for sandstone.…”

Section: Dilatancy and Viscoplastic Flowmentioning

confidence: 94%

A Generalized Plasticity-Based Model for Sandstone Considering Time-Dependent Behavior and Wetting Deterioration

Weng

2013

Rock Mech Rock Eng

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Based on the concept of generalized plasticity, this study proposes a constitutive model to describe the time-dependent behavior and wetting deterioration of sandstone. The proposed model (1) exhibits nonlinear elasticity under hydrostatic and shear loading, (2) follows the associated flow rule for viscoplastic deformation, (3) adopts a creep modulus that varies with the stress ratio, (4) considers the primary and secondary creep behaviors of rock, and (5) considers the effect of wetting deterioration. This model requires 13 material parameters, comprising 3 for elasticity, 7 for plasticity, and 3 for creep. All parameters can be determined easily by following the suggested procedures. The proposed model is first validated by comparison with triaxial tests of sandstone under different hydrostatic stress and cyclic loading conditions. In addition, the model is versatile in simulating time-dependent behavior through a series of multistage creep tests. Finally, to consider the effects of wetting deterioration, triaxial and creep tests under dry and water-saturated conditions are simulated. Comparison of the simulated and experimental data shows that the proposed model can predict the behavior of sandstone in dry and saturated conditions.

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Time-dependent deformation behaviors of weak sandstones

Cited by 103 publications

References 13 publications

Time-Dependent Behavior of Cataclastic Rocks in a Multi-Loading Triaxial Creep Test

Time-Dependent Behavior of Cataclastic Rocks in a Multi-Loading Triaxial Creep Test

Experimental Investigation on the Strength, Deformability, Failure Behavior and Acoustic Emission Locations of Red Sandstone Under Triaxial Compression

A Generalized Plasticity-Based Model for Sandstone Considering Time-Dependent Behavior and Wetting Deterioration

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