多级等幅循环荷载作用下砂岩变形、渗透及声发射特征试验研究

doi:10.13722/j.cnki.jrme.2023.1171

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1756 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为探明多级等幅循环荷载对岩石变形、损伤及渗透规律的影响，对砂岩试样开展不同围压下的四级等幅循环加卸载三轴试验，试验过程中实时监测渗透和声发射信号。分析多级等幅循环荷载作用过程中围压、循环荷载对试样特征应力、渗透率及声发射b值和RA-AF值的影响。结果表明：(1) 与常规三轴加载相比，多级等幅循环加载试验中每级循环荷载下砂岩裂纹体积应变均扩张，循环加载试验岩样的峰值应力下降，随着围压增大，两者峰值应力差值减小。(2) 在2种加载条件中渗透率均先下降后上升，循环加卸载作用后岩样基于应变的渗透率损失率(PSL)更小，表明岩石内部宏观变形加剧，随着围压增大，PSL随之增大，表明宏观变形减弱；低围压下各级循环中基于应力的渗透率损失系数(EIP)为负值或数值较小，表明渗透率增加，而高围压下第4级循环中EIP为正值，表明渗透率减小，渗流通道的形成受围压约束的影响加剧。(3) 与常规三轴试验相比，多级等幅循环加载声发射b值起伏变化更大；2种加载方式下岩样均以拉伸裂纹为主，但多级等幅循环加载条件下岩样内部产生的剪切裂纹更多，随着围压增大，岩石拉伸裂纹占比逐渐减小，剪切裂纹占比增大。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	陈旭1
	2
	肖义2
	汤明高1
	2
	焦彤2
	张帆3

关键词 ：岩石力学, 岩石破坏, 多级等幅循环加载, 渗透演化, 声发射

Abstract：In order to explore the influence of multi-stage cyclic loading with a constant amplitude on rock deformation，damage and permeability，a four-stage cyclic loading and unloading triaxial test was carried out on sandstone samples under different confining pressures. The permeability was measured and acoustic emission (AE) signals were monitored in real time during the test. The effects of confining pressure and cyclic loading on the characteristic stresses，permeability，b-value and RA-AF(risetime/amplitude - average frequency) value of AE signals during multi-stage cyclic loading are analyzed. The results show that：(1) Compared with the conventional triaxial compressive test，the volume strain of the sandstone crack under each stage of the multi-stage cyclic loading test is expanded，and the peak stress decreases. With the increase of confining pressure，the difference between the two peak stresses decreases. (2) Under the two loading conditions，the permeability decrease first and then increase. After cyclic loading，the permeability strain-based loss rate(PSL) of the rock sample is smaller，and the macroscopic deformation of the rock is aggravated. When the confining pressure increases，the PSL increases and the macroscopic deformation decreases. Under low confining pressure，the stress-based irrecoverable permeability coefficient(EIP) in each cycle is negative or small，and the permeability increases. Under high confining pressure，EIP value in the fourth cycle is positive，indicating that the permeability decreases，and the formation of seepage channel is affected by confining pressure constraints. (3) Furthermore，the b-value of AE signals under multi-stage cyclic loading fluctuates more than in the conventional triaxial test. Under the two loading modes，the rock samples are dominated by tensile cracks. Under the condition of multi-stage cyclic loading，there are more shear cracks in the rock sample，and with the increase of confining pressure，the proportion of rock tensile cracks gradually decreases，and the proportion of shear cracks increases.

Key words： rock mechanics rock failure multi-stage cyclic loading permeability evolution acoustic emission

引用本文:

陈旭1，2，肖义2，汤明高1，2，焦彤2，张帆3. 多级等幅循环荷载作用下砂岩变形、渗透及声发射特征试验研究[J]. 岩石力学与工程学报, 2024, 43(8): 1923-1935.
CHEN Xu1，2，XIAO Yi2，TANG Minggao1，2，JIAO Tong2，ZHANG Fan3. Experimental study on deformation，permeability and AE characteristics of sandstone under multi-stage cyclic loading with a constant amplitude. , 2024, 43(8): 1923-1935.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1171 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I8/1923

[20]	MARTIN C D. The strength of massive Lac du Bonnet granite around underground openings[Ph. D. Thesis][D]. Canada，Manitoba：University of Manitoba，1993.
[8]	MOMENI A，KARAKUS M，KHANLARI G，et al. Effects of cyclic loading on the mechanical properties of a granite[J]. International Journal of Rock Mechanics and Mining Sciences，2015，77：89-96.
[18]	CHEN X，YU J，TANG C A，et al. Experimental and numerical investigation of permeability evolution with damage of sandstone under triaxial compression[J]. Rock Mechanics and Rock Engineering，2017，50(6)：1 529-1 549.
[2]	TAVALLALI A，VERVOORT A. Effect of layer orientation on the failure of layered sandstone under Brazilian test conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(2)：313-322.
[4]	DU K，TAO M，LI X B，et al. Experimental study of slabbing and rockburst induced by true-triaxial unloading and local dynamic disturbance[J]. Rock Mechanics and Rock Engineering，2016，49(9)：3 437-3 453.
[7]	XIAO J，DING D，JIANG F，et al. Fatigue damage variable and evolution of rock subjected to cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences，2009，47(3)：461-468.
[10]	MENG Q B，ZHANG M W，HAN L J，et al. Effects of acoustic emission and energy evolution of rock specimens under the uniaxial cyclic loading and unloading compression[J]. Rock Mechanics and Rock Engineering，2016，49(10)：3 873-3 886.
[12]	ZHU C，MURAT K C，HE M C，et al. Volumetric deformation and damage evolution of Tibet interbedded skarn under multistage constant-amplitude-cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences，2022，152：105066.
[17]	DAVY C A，SKOCZYLAS F，BARNICHON J D，et al. Permeability of macro-cracked argillite under confinement：gas and water testing[J]. Physics and Chemistry of the Earth，2006，32(8)：667-680.
[22]	LIU B，SUN Y D，WANG J，et al. Characteristic analysis of crack initiation and crack damage stress of sandstone and mudstone under low-temperature condition[J]. Journal of Cold Regions Engineering，2020，34(3)：04020020.
[14]	ZHANG L，NIU F J，LIU M H，et al. Mechanical behavior of cracked rock in cold region subjected to step cyclic loading[J]. Geofluids，2022：6220549.
[1]	MENG Q B，LIU J F，REN L，et al. Experimental study on rock strength and deformation characteristics under triaxial cyclic loading and unloading conditions[J]. Rock Mechanics and Rock Engineering，2021，54：777-797.
[3]	YANG S Q，YANG Z，JING H W，et al. Fracture evolution mechanism of hollow sandstone under conventional triaxial compression by X-ray micro-CT observations and three-dimensional numerical simulations[J]. International Journal of Solids and Structures，2019，190(5)：156-180.
[5]	SUN B，ZHU Z，SHI C，et al. Dynamic mechanical behavior and fatigue damage evolution of sandstone under cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences，2017，94：82-89.
[15]	PENG K，ZHOU J，ZOU Q，et al. Effect of loading frequency on the deformation behaviours of sandstones subjected to cyclic loads and its underlying mechanism[J]. International Journal of Fatigue，2020，131：105349.
[24]	LI L，YANG D Y，LIU W，et al. Experimental study on the porosity and permeability change of high-rank coal under cyclic loading and unloading[J]. ACS Omega，2022，7(34)：30 197-30 207.
[25]	XU H H. The anisotropy permeability evolution and deformation behavior of raw coal under cyclic loading conditions[J]. Geofluids，2023：5093331.
[28]	董陇军，张义涵，孙道元，等. 花岗岩破裂的声发射阶段特征及裂纹不稳定扩展状态识别[J]. 岩石力学与工程学报，2022，41(1)：120-131.(DONG Longjun，ZHANG Yihan，SUN Daoyuan，et al. Stage characteristics of acoustic emission and identification of unstable crack state for granite fractures[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(1)：120-131.(in Chinese))
[30]	SHI Z M，LI J T，WANG J，et al. Experimental and numerical study on fracture characteristics and constitutive model of sandstone under freeze-thaw-fatigue[J]. International Journal of Fatigue，2023，166：107236.
[32]	LI H，MA H L，YANG C H，et al. Acoustic emission characteristics of rock salt under multi-stage cyclic loading[J]. International Journal of Fatigue，2023，176：107911.
[6]	YILDIRIM H，ERS，AN H. Settlements under consecutive series of cyclic loading[J]. Soil Dynamics and Earthquake Engineering，2007，27(6)：577-585.
[13]	FU H L，HU K X，SHI Y，et al. Deformation behaviour and damage evolution of carbonaceous phyllite under cyclic triaxial loading[J]. Materials(Basel，Switzerland)，2023，16(13)：4 612.
[16]	WONG L N Y，LI D Y，LIU G. Experimental studies on permeability of intact and singly jointed metasedimentary rocks under confining pressure[J]. Rock Mechanics and Rock Engineering，2013，46(1)：107-121.
[23]	杨永明，鞠杨，陈佳亮，等. 三轴应力下致密砂岩的裂纹发育特征与能量机制[J]. 岩石力学与工程学报，2014，33(4)：691-698. (YANG Yongming，JU Yang，CHEN Jialiang，et al. Cracks development features and energy mechanism of dense sandstone subjected to triaxial stress[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(4)：691-698.(in Chinese))
[26]	CHEN X，TANG C A，YU J，et al. Experimental investigation on deformation characteristics and permeability evolution of rock under confining pressure unloading conditions[J]. Journal of Central South University，2018，25(8)：1 987-2 001.
[9]	杨小彬，韩心星，刘恩来，等. 等幅循环加载岩石非均匀变形演化试验研究[J]. 采矿与安全工程学报，2019，36(2)：388-395.(YANG Xiaobin，HAN Xinxing，LIU Enlai，et al. Experimental study on the evolution of non-uniform deformation of rock under constant amplitude cyclic loading[J]. Journal of Mining and Safety Engineering，2019，36(2)：388-395.(in Chinese))
[11]	JIANG C B，DUAN M K，YIN G Z，et al. Experimental study on seepage properties，AE characteristics and energy dissipation of coal under tiered cyclic loading[J]. Engineering Geology，2017，221： 114-123.
[21]	赵延林，曹平，林杭，等. 渗透压作用下压剪岩石裂纹流变断裂贯通机制及破坏准则探讨[J]. 岩土工程学报，2008，30(4)：914-925.(ZHAO Yanlin，CAO Ping，LIN Hang，et al. Rheologic fracture mechanism and failure criterion of rock cracks under compressive- shear load with seepage pressure[J]. Chinese Journal of Geotechnical Engineering，2008，30(4)：914-925.(in Chinese))
[31]	LI H，WANG F，CHEN F，et al. Comparison of high-frequency components in acoustic emissions from rock fracture under Mode Ⅰ and Mode Ⅱ dominated loading[J]. International Journal of Rock Mechanics and Mining Sciences，2023，170：105554.
[19]	BIENIAWSKI Z T. Mechanism of brittle fracture of rock：Part II—experimental studies[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1967，4(4)：407-423.
[29]	XU R C，ZHANG S Z，LI Z，et al. Experimental investigation of the strain rate effect on crack initiation and crack damage thresholds of hard rock under quasi-static compression[J]. Acta Geotech，2022，18(2)：903-920.
[27]	曾正文，马瑾，刘力强，等. 岩石破裂扩展过程中的声发射b值动态特征及意义[J]. 地震地质，1995，17(1)：7-12.(ZENG Zhengwen，MA Jin，LIU Liqiang，et al. AE b-value dynamic features during rock mass Fracturing and their significances[J]. Seismology and Geology，1995，17(1)：7-12.(in Chinese))