Experimental study on deformation and failure characteristics of saturated sandstone under graded cyclic loading and unloading

被引：0

作者：

Yuan H. ^{[1
,2
]}

Erdi A. ^{[1
]}

Zhang J. ^{[3
]}

Cong Y. ^{[4
]}

Liu M. ^{[1
,2
]}

Pu Y. ^{[1
,2
]}

Lin H. ^{[1
,2
]}

机构：

[1] Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing Jiaotong University, Chongqing

[2] PowerChina Guiyang Engineering Corporation Limited, Guizhou, Guiyang

[3] College of Engineering, Xizang University, Xizang, Lhasa

[4] School of Civil Engineering, Qingdao University of Technology, Shandong, Qingdao

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷

基金：

中国国家自然科学基金;

关键词：

deformation characteristic parameters; failure characteristics; hierarchical cyclic loading and unloading; loading rate; rock mechanics; saturated sandstone;

D O I：

10.13722/j.cnki.jrme.2022.0904

中图分类号：

学科分类号：

摘要：

For water-rich tunnel in different construction stages under variable amplitude load disturbance of surrounding rock damage problem，by conducting graded loops and unloading test，analysis of loops and unloading stress-strain hysteresis curve，in the process of rock deformation parameters and macro fracture characteristics，revealing the grading loops and uninstall the deformation and failure regularity of saturated sandstone. The results show that with the increase of loading amplitude，the migration of hysteresis loop decreases first and then increases，the area of hysteresis loop increases step by step，and the axial strain of hysteresis loop develops as“sparse-dense-sparse”. The elastic modulus decreases step by step in the form of“sudden drop-slow drop-accelerated drop”，and Poisson's ratio changes in the form of“step by step drop-relatively stable-rise”. The confining pressure increases the stiffness and deformation resistance of rock samples，the overall elastic modulus，the initial Poisson's ratio，and the residual strain increase，but the weakening effect is obvious under the cyclic loading and unloading of the late yield section. The faster the loading rate is，the more obvious the load meshing friction effect is，the greater the average loading and unloading modulus is，and the less the irreversible deformation of the rock sample is，but the Poisson effect is not obvious. With the increase of confining pressure，the failure of sandstone changes from tension shear composite failure to compression shear failure；The smaller the load rate is，the more developed the main fracture is，the higher the penetration degree is，and the greater the scouring degree of the fracture surface is. The deformation and failure law of saturated sandstone revealed by the study has significant reference value for the deformation，damage and stability analysis of surrounding rock of rich water tunnel. © 2023 Academia Sinica. All rights reserved.

引用

页码：3943 / 3955

页数：12

共 37 条

[1] TAHERI A, ROYLE A, YANG Z，, Et al., Study on variations of peak strength of a sandstone during cyclic loading[J], Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2, 1, pp. 1-10, (2016)
[2] BIENIAWSKI Z T., Time-dependent behaviour of fractured rock[J], Rock Mechanics Felsmechanik Mécaniquedes Roches, 2, 3, pp. 123-137, (1970)
[3] BAI M，, ELSWORTH D., Analytical solution. coupled processes in subsurface deformation，flow，and transport[M], pp. 163-213, (2000)
[4] ZHOU Hui, HU Dawei, ZHANG Kai, Et al., Mechanism and theory of fluid-solid coupling of pore and fissured rocks under high osmotic pressure, pp. 82-95, (2014)
[5] RUTQVIST J, STEPHANSSON O., The role of hydromechanical coupling in fractured rock engineering[J], Hydrogeology Journal, 11, 1, (2003)
[6] ZHANG Ying, Peng LI, GUO Qifeng, Et al., Research progress of deformation and failure mechanism in fractured rock mass under hydromechanical coupling[J], Journal of Harbin Institute of Technology, 52, 6, pp. 21-41, (2020)
[7] LU Yinlong, Hydro-mechanical modeling of fracturing evolution in rocks and mechanism of water-inrush from coal seam floor, (2013)
[8] ZHANG Z, XIE H, RU Z，, Et al., Deformation damage and energy evolution characteristics of coal at different depths[J], Rock Mechanics and Rock Engineering, 52, pp. 1-13, (2018)
[9] ZHOU Xiaoping, HA Qiuling, ZHANG Yongxing, Et al., Analysis of localization of deformation and complete stress-strain relation for mesoscopic heterogenous brittle rock materials when axial stress is held constant while lateral confinement is reduced[J], Chinese Journal of Rock Mechanics and Engineering, 24, 18, pp. 3236-3245, (2005)
[10] LI Diyuan, SUN Zhi, LI Xibing, Et al., Mechanical response and failure characteristics of granite under different stress paths in triaxial loading and unloading conditions, Chinese Journal of Rock Mechanics and Engineering, 35, pp. 3449-3457, (2016)

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