Creep behavior of boom clay

Yu, Hongdan; Chen, W.Z.; Gong, Zhe; Tan, Xianjun; Ma, Yongshang; Li, X.L.; Sillen, X.

doi:10.1016/j.ijrmms.2015.03.009

Cited by 28 publications

(11 citation statements)

References 27 publications

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“…Few data exist on creep behavior of Opalinus clay (Naumann et al, 2007), Boom clay (Yu et al, 2015) and Callovia-Oxfordian Bure Clay (Gasc-Barbier et al, 2004) and other argillaceous rocks (Fabre and Pellet, 2006;Zhang and Rothfuchs, 2004). These studies show that even under low differential stress (< 16 MPa) the apparent steady creep rate increases with stress nonlinearly.…”

Section: Effect Of Stress Pressure and Temperature On Secondary Creepmentioning

confidence: 99%

“…For long time uniaxial creep tests lasting over hundreds of days, the creep rate tends to stabilize at about 10 -11 -10 -10 s -1 , sometimes also associated with dilational behavior (Fabre and Pellet, 2006;Naumann et al, 2007;Yu et al 2015;Zhang and Rothfuchs, 2004).…”

Section: Effect Of Stress Pressure and Temperature On Secondary Creepmentioning

confidence: 99%

“…Few data exist dealing with the creep behavior of Opalinus clay (Naumann et al, 2007), Boom clay (Yu et al, 2015), Callovia-Oxfordian Bure Clay (Gasc-Barbier et al, 2004), and other argillaceous rocks (Zhang and Rothfuchs, 2004;Fabre and Pellet, 2006). Creep experiments on shales focus on compaction and consolidation (Cogan, 1976;de Waal and Smits, 1988;Dudley et al, 1998), the effect of adsorption and swelling on creep (Heller and Zoback, 2011;Hol and Zoback, 2013) and on viscoelastic or viscoplastic creep of shales in response to nanoindentation (Mighani et al, 2015) and applied differential stresses at elevated confining pressures (Almasoodi et al, 2014;Zoback, 2009, 2010;Chong et al, p [5] creep is enhanced at high differential stress, high clay content, in the presence of water and if loaded normal to bedding orientation.…”

Section: Introductionmentioning

confidence: 99%

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Creep of Posidonia Shale at Elevated Pressure and Temperature

et al. 2017

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The economic production of gas and oil from shales requires repeated hydraulic fracturing operations to stimulate these tight reservoir rocks. Besides simple depletion, the often observed decay of production rate with time may arise from creep-induced fracture closure.We examined experimentally the creep behavior of an immature carbonate-rich Posidonia shale, subjected to constant stress conditions at temperatures between 50° and 200°C and confining pressures of 50 to 200 MPa, simulating elevated in-situ depth conditions. Samples showed transient creep in the semibrittle regime with high deformation rates at high differential stress, high temperature, and low confinement. Strain was mainly accommodated by deformation of the weak organic matter and phyllosilicates and by pore space reduction.The primary decelerating creep phase observed at relatively low stress can be described by an empirical power law relation between strain and time, where the fitted parameters vary with temperature, pressure and stress. Our results suggest that healing of hydraulic fractures at low stresses by creep-induced proppant embedment is unlikely within a creep period of several years. At higher differential stress, as may be expected in situ at contact areas due to stress concentrations, the shale showed secondary creep, followed by tertiary creep until failure. In this regime, microcrack propagation and coalescence may be assisted by stress corrosion.Secondary creep rates were also described by a power law, predicting faster fracture closure rates than for primary creep, likely contributing to production rate decline. Comparison of our data with published primary creep data on other shales suggest that the long-term creepbehavior of shales can be correlated to their brittleness estimated from composition. Low creep strain is supported by a high fraction of strong minerals that can build up a load-bearing framework.

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Section: Effect Of Stress Pressure and Temperature On Secondary Creepmentioning

confidence: 99%

Section: Effect Of Stress Pressure and Temperature On Secondary Creepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Creep of Posidonia Shale at Elevated Pressure and Temperature

et al. 2017

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“…At present, the study of creep behavior has been extended to evaluate the longterm deformation of most geotechnical engineering applications such as slope stability, tunnel, dam, etc. More robust research, such as study of the three-dimensional or in situ creep behavior of different kinds of soils, such as clay (Sayed-Ahmed et al, 1998;Naumann et al, 2007;Maio et al, 2015), boom clay (Yu et al, 2015), soft clay (Yin et al, 2015), expansive clay (Vu and Fredlund, 2004;Thyagaraj and Rao, 2013), and sand (Zhang et al, 2018) have been carried out. The long-term mechanical properties of sandstone and tailings are particularly important in the fields of hydropower, energy, mining and others.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Red-Clay Under Triaxial Compression Condition

Ke-min

Wang

et al. 2020

Front. Earth Sci.

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To investigate the shear strength and creep behavior of red-clay, laboratory experiments were conducted and the experimental results were compared with available theoretical creep models. Based on the consolidated drained (CD) triaxial tests results, internal friction angle and cohesion of the red clay soil were 21.5 • and 61.1 kPa, respectively. Three different confining pressures were set up to conduct the creep tests using multistage loading. The overall creep curves exhibited stepped stress-strain behavior. The creep behaviors were remarkably different from the soils tested with three distinct confining stresses. The post-creep failure mode of all the red clay samples exhibited drum shaped parabolic bulging with predefined shear planes. The experimental results were compared with three different types of creep models that used in practice. Among all of this verified results, Burger's model behaved betted than other models when fitting with the data collected from the experiment. An experimental result based empirical equation has also been developed which fits well with the experimental results obtained from the tested red clay samples. The results of this study will be helpful to evaluate the long-term shear strength and deformation of red clays subjected to various structural loadings.

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“…Many laboratory studies investigated the creep behavior of various soils [5][6][7]. Yu et al [8] performed several creep tests (lasting more than one year) to study the delayed mechanical behavior of Boom clay under the hydromechanical coupling effect. Wen and Jiang [9] discussed creep behavior of natural clayey soil with gravel at the residual state through a series of creep shear tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Studies on the Creep Behavior of Bayer Red Mud

Zhao

Huang

Shu

et al. 2018

Advances in Civil Engineering

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Long-term stability and safety of the Bayer red mud (BRM) disposal field is very important for the local residents’ life, which necessitates the knowledge of its creep behavior. In order to investigate the creep behavior of BRM, a series of triaxial drained creep tests were conducted by using an improved triaxial creep apparatus. The results indicate that the creep behavior of BRM is significant with confining and deviatoric stresses being critical factors. The creep strain is in a nonlinear relationship with stress and time, and a larger deviator stress will lead to a larger creep strain. The main failure mechanism of BRM is plastic shear, accompanied by a significant compression and ductile dilatancy. Based on the test results, two well-established creep models, the Burgers creep model and Singh–Mitchell creep model, were used to comparatively analyze the creep behavior of the Bayer red mud under a certain stress level. Then, an improved Burgers creep damage constitutive model with the addition of a damage variable was proposed, whose parameters were also analyzed in detail. The comparison of the calculated values of the creep model and the experimental values shows that the proposed creep damage model can better describe the instant elastic deformation, attenuation creep, steady-state creep, and accelerated creep stages of the Bayer red mud.

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Creep behavior of boom clay

Cited by 28 publications

References 27 publications

Creep of Posidonia Shale at Elevated Pressure and Temperature

Creep of Posidonia Shale at Elevated Pressure and Temperature

Creep Behavior of Red-Clay Under Triaxial Compression Condition

Experimental and Theoretical Studies on the Creep Behavior of Bayer Red Mud

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