Effect of pore pressure on deformation and unstable snap-back for shear band and elastic rock system

Effect of pore pressure on deformation and unstable snap-back for shear band and elastic rock

system

WANG Xue-bin

【期刊名称】《中南大学学报（英文版）》 【年(卷),期】2007(014)003

【摘要】Fast Lagrangian analysis of continua(FLAC) was used to study the influence of pore pressure on the mechanical behavior of rock specimen in plane strain direct shear, the distribution of yielded elements, the distribution of displacement and velocity across shear band as well as the snap-back (elastic rebound) instability. The effective stress law was used to represent the weakening of rock containing pore fluid under pressure. Numerical results show that rock specimen becomes soft (lower strength and hardening modulus) as pore pressure increases, leading to higher displacement skip across shear band. Higher pore pressure results in larger area of plastic zone, higher concentration of shear strain, more apparent precursor to snap-back (unstable failure) and slower snap-back. For higher pore pressure, the formation of shear band-elastic body system and the snap-back are earlier; the distance of snap-back decreases; the capacity of snap-back decreases, leading to lower elastic strain energy liberated beyond the instability and lower earthquake or rockburst magnitude. In the process

of snap-back, the velocity skip across shear band is lower for rock specimen at higher pore pressure, showing the slower velocity of snap-back.

【总页数】7页(418-424)

【关键词】pore pressure;shear band;snap-back;strain-softening;unstable failure;stress-strain curve 【作者】WANG Xue-bin

【作者单位】Department of Mechanics and Engineering Sciences, Liaoning Technical University, Fuxin 123000, China 【正文语种】中文 【中图分类】TP3 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_journal-central-south-university_thesis/020128303901.html 【相关文献】

1.Shear stress distribution and characteristics of deformation for shear band-elastic body system at pre-peak and post-peak [J], WANG Xue-bin 2.Numerical simulation of influence of shear dilatancy on deformation characteristics of shear band-elastic body system [J], WANG Xue-bin 3.Localized shear deformation during shear band propagation in titanium considering interactions among microstructures [J], 王学滨; 杨梅; 于海军; 海龙; 潘一山

4.Quantitative calculation of local shear deformation in adiabatic shear band for Ti-6Al-4V [J],

5.Extensional deformation of post ultrahigh-pressure metamorphism and exhumation process of ultrahigh-pressure metamorphic rocks in the Dabie massif,China [J], 索书田; 钟增球; 游振东

以上内容为文献基本信息，获取文献全文请下载