Results 21 to 30 of about 1,567 (145)

Improved Nishihara model considering the effect of moisture content on the whole shear creep process of shale

open access: yes, 2022
Abstract The moisture content is closely related to the shear creep deformation behavior of soft rock, and the linear creep deformation behavior of soft rock can be described by the classical Nishihara model. However, the classical Nishihara model cannot describe the deformation characteristics of the whole process of shear creep including ...
Bin Hu   +5 more
openaire   +1 more source

Determination of the parameters of rock viscoelastic creep model and analysis of parameter degradation

open access: yesScientific Reports, 2023
Different stress creep tests are conducted on the sandstone in this study to better describe the creep properties of rocks under different stress states. A model that describes the rock creep process is established.
Zhiming Zheng, Yu Yang, Cheng Pan
doaj   +1 more source

Creep characteristics and nonlinear creep damage model of Bocigou formation slate in Kangding-Xinduqiao section of West Sichuan

open access: yesShuiwen dizhi gongcheng dizhi, 2023
The creep characteristics of rock are closely related to the long-term stability of rock mass. With the excavation of deep buried tunnels in west China, in order to ensure the safety of engineering and the long-term stability of underground buildings, it
Xiao HE   +8 more
doaj   +1 more source

Experimental investigation of the mechanical properties of mud shale under water-bearing conditions and its applications

open access: yesScientific Reports, 2022
Mud shale, used in drilling engineering, is prone to hydration and expansion, resulting in creep deformation that leads to wellbore shrinkage and pipe sticking incidents.
Xinxin Fang   +3 more
doaj   +1 more source

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

open access: yesScientific Reports, 2022
Deep resource extraction has been affected by the complex geological environment of "three highs and one disturbance" for a long time. The surrounding rocks experience strong unloading stress disturbance during the underground resource extraction.
Zhonghao Liang   +5 more
doaj   +1 more source

Seismic performance of group pile foundation with ground improvement during liquefaction [PDF]

open access: yes, 2021
A pile foundation with ground improvement under the footing is a composite foundation with the objectives of enhancing the seismic performance and rationalizing the substructure by combining the pile foundation with ground improvement.
Sawamura, Yasuo   +11 more
core   +1 more source

Accelerated creep model for rock based on statistical damage principle

open access: yesYantu gongcheng xuebao, 2020
Aiming at the problems that the existing creep theoretical models cannot describe the accelerated creep characteristics of the viscoplastic phase of rock and how to determine the start conditions of its accelerated creep phase, the triaxial creep tests ...
LIU Wen-bo 1, 3, ZHANG Shu-guang 1, 2, CHEN Lei 3, SUN Bo-yi 3, LU Ping-ping 3
doaj   +1 more source

Viscoelastic–plastic creep constitutive model of frozen soil [PDF]

open access: yes, 2017
In accordance with the twin-shear unified strength theory and the improved Nishihara model, a viscoelastic–plastic creep constitutive function of frozen soil has been established based on the associated flow rules, and the viscoelastic–plastic soft ...
Junhai Zhao, Xueye Cao, Yan Li
core   +1 more source

Real-Time Flow Behavior of Hot Mix Asphalt (HMA) Compaction Based on Rheological Constitutive Theory [PDF]

open access: yes, 2019
Compaction is the most critical stage during pavement construction, but the real-time rheological behavior in the compaction process of hot mix asphalt has not received enough attention. Rheological properties directly reflect the of mixture performance,
Ningyuan Li   +4 more
core   +1 more source

Wnt signaling mediates acquisition of blood-brain barrier properties in naïve endothelium derived from human pluripotent stem cells. [PDF]

open access: yes, 2021
Endothelial cells (ECs) in the central nervous system (CNS) acquire their specialized blood-brain barrier (BBB) properties in response to extrinsic signals, with Wnt/β-catenin signaling coordinating multiple aspects of this process.
Canfield, Scott G   +18 more
core   +1 more source

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