Results 21 to 30 of about 4,092 (259)

Triaxial creep test and model study of red sandstone based on Weibull distribution

Shuiwen dizhi gongcheng dizhi, 2023
At present, the creep problem of underground engineering surrounding rock still exists, and the creep theory needs to be further enriched. In essence, rock creep is a process of constant accumulation of damage.
Weize ZHANG, Linqing WANG, Wenchong GUO, Lei CHEN   +3 more
doaj   +1 more source

Experimental Study on Shear Creep and Long-Term Strength of Clay-Type Muddy Interlayer

Applied Sciences, 2023
In order to have a better understanding of the shear creep characteristics of muddy interlayer in unstable landslides, we took the more “inferior” clay muddy interlayer as the research object, and shear creep experiments under different normal stress ...
Pengzheng Guo, Jiaming Zhang, Fei Liu, Wenlian Liu, Zhiqiang Wang, Jipu Chen   +5 more
doaj   +1 more source

Experimental investigation of the creep damage evolution of coal rock around gas extraction boreholes at different water contents.

PLoS ONE, 2023
The creep process of the coal rock around the extraction boreholes under stress-water coupling is an important factor affecting the stability of the boreholes. To study the influence of the water content of perimeter of the coal rock around the boreholes
Jiangbo Guo, Tianjun Zhang, Hongyu Pan, Jinyu Wu   +3 more
doaj   +2 more sources

Analysis of an improved Nishihara creep model considering plastic strain accumulation

Frontiers in Materials, 2023
Rock-engineering structures, particularly subway excavation rock-engineering structures, are subjected to the long-term effects of external loading that may gradually damage and cause creep and severe plastic deformations or even progressive failure. The
Yang Cheng, Liangliang Zhang
doaj   +1 more source

A Nonlinear Creep-damage Constitutive Model of Mudstone Based on the Fractional Calculus Theory [PDF]

Journal of Petroleum Science and Technology, 2017
During the flood development in an oil field, the creep characteristic of mudstone is one of the important factors causing casing damage. In this study, based on the theory of fractional order differential and taking into account the creep damage ...
Zhang Jun, Zeng Jia
doaj   +1 more source

Non-stationary Nishihara model in the particle flow code

工程科学学报, 2015
In order to accurately simulate the whole process of rock creep and explore the generation and development of mircofractures from the meso-level,a visco-elastoplastic Nishihara rheological constitutive model is developed in the two-dimensional particle ...
YANG Zhen-wei, JIN Ai-bing, GAO Yong-tao, WANG Kai, SUN Hao   +4 more
doaj   +1 more source

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

Scientific 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, Hong Feng, Fengling Li, Hao Wang   +3 more
doaj   +1 more source

Viscoelastic plastic creep constitutive model based on energy conservation law and strain energy theory

Scientific Reports
On the basis of the law of conservation of energy, the three stages of rock creep are analyzed. The reasons for the difficulty in studying the accelerated creep stage of rocks using the traditional creep model are expounded.
Di Zhou, Xiangjin Tian, Shuguang Zhang, Wang Zeng, Minye Zhang, Yanchao Feng, Wenbo Liu, Xiang Huang, Mingzhuo Fan, Ye Sun   +9 more
doaj   +1 more source

Study on the Nonlinear Damage Creep Model of the Weak Interlayer

Advances in Civil Engineering, 2022
The weak interlayer has become a weak link in slope engineering due to its rheological effect. It is of great significance to study the nonlinear creep model of weak interlayer for long-term stability of the slope. In this paper, based on the creep curve
Erjian Wei, Bin Hu, Kunyun Tian, Peishan Cen, Zhen Zhang, Zeqi Wang, Shuxiang Chang   +6 more
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source