不同应力水平下砂岩时滞性单轴压缩破坏特性研究

doi:10.16285/j.rsm.2021.0275

岩土力学 ›› 2021, Vol. 42 ›› Issue (11): 3041-3050.doi: 10.16285/j.rsm.2021.0275

不同应力水平下砂岩时滞性单轴压缩破坏特性研究

徐鹏飞¹，邓华锋¹，张恒宾¹，彭萌¹，李冠野¹，姜桥²，陈兴周³

1. 三峡大学三峡库区地质灾害教育部重点实验室，湖北宜昌 443002； 2. 中国三峡建设管理有限公司乌东德工程建设部，四川成都 610000；3. 西安科技大学建筑与土木工程学院，陕西西安 710054

收稿日期:2021-02-22 修回日期:2021-07-12 出版日期:2021-11-11 发布日期:2021-11-12
通讯作者: 邓华锋，男，1979年生，博士，教授，主要从岩土工程方面的教学与研究工作。E-mail: dhf8010@ctgu.edu.cn E-mail:2425628435@qq.com
作者简介:徐鹏飞，男，1996年生，硕士研究生，主要从岩土工程方面的研究工作。
基金资助:
国家自然科学基金资助项目（No. U2034203，No. 51979218）；三峡大学2019级硕士学位论文培优基金（No. 2021SSPY020）

Time-lag uniaxial compression failure characteristics of sandstone under different stress levels

XU Peng-fei¹, DENG Hua-feng¹, ZHANG Heng-bin¹, PENG Meng¹, LI Guan-ye¹, JIANG Qiao², CHEN Xing-zhou³

1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China; 2. Wudongde Engineering Construction Department of China Three Gorges Construction Management Co., Ltd., Chengdu, Sichuan 610000, China; 3. College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China

Received:2021-02-22 Revised:2021-07-12 Online:2021-11-11 Published:2021-11-12
Supported by:
This work was supported the National Nature Science foundation of China (U2034203, 51979218) and the Research Fund for Excellent Dissertation of China Three Gorges University 2019 Master's Degree Thesis(2021SSPY020).

摘要/Abstract

摘要： 地下工程开挖导致的岩爆具有明显的滞后效应，研究显示，滞后型岩爆的发生与岩石的时滞性破坏密切相关，基于此，考虑开挖后围岩处于不同的应力水平，进行了时滞性单轴压缩试验，详细分析不同应力水平下岩石的时滞性变形破坏特征。研究结果表明：应力水平对岩石的时滞性变形破坏影响显著，随着应力水平的提高，破坏孕育时间呈指数衰减，但远超过常规单轴压缩破坏的孕育时间；时滞性单轴压缩破坏时，岩样的环向应变和体积应变明显大于常规单轴压缩试验，而且应力水平低于90%时，破坏时的环向应变迅速增长并超过了轴向应变，这也是时滞性破坏区别与常规单轴压缩破坏的显著特征；时滞性单轴压缩破坏时的总能量与常规单轴压缩总体相当，但时滞性加载过程中，耗散能所占的比重明显增加，说明时滞性加载阶段会导致岩石内部的损伤显著发育；时滞性加载阶段岩样环向应变的快速增长导致近轴向劈裂张拉破坏裂纹显著增加，这也导致岩样破坏的碎裂程度更加严重。相关研究成果可为岩石在高应力水平下损伤破坏的时效性及时滞性岩爆分析解释提供较好的参考。

关键词: 时滞性, 应力水平, 变形特征, 耗散能, 破坏形态

Abstract: Rockburst caused by underground engineering excavation has obvious time-lag effect. Previous research shows that the occurrence of hysteresis rockburst is closely related to the time-lag damage of the rock. Based on this, considering that the surrounding rock is at different stress levels after excavation, the time-delay uniaxial compression test is carried out to analyze the time-delay deformation and failure characteristics of rocks under different stress levels. The results show that the stress level has a significant impact on the time-delay deformation and failure of rocks. As the stress level increases, the failure incubation time decreases exponentially, but it is much longer than that of conventional uniaxial compression failure. In the case of delayed uniaxial compression failure, the hoop strain and volume strain of the rock sample are significantly greater than that of conventional uniaxial compression test, and when the stress level is lower than 90%, the hoop strain at failure rapidly increases and exceeds the axial strain, which is also the distinguishing feature of time-lag failure and conventional uniaxial compression failure. The total energy of delayed uniaxial compression failure is equivalent to that of conventional uniaxial compression, but the proportion of dissipated energy increases significantly in the process of delayed loading, indicating that the delayed loading stage will lead to the significant development of damage in the rock. The rapid growth of circumferential strain of rock samples in the stage of time-delay loading leads to the significant increase of near axial splitting tensile failure cracks, which also leads to the more serious fragmentation of rock samples. The relevant research results can provide a good reference for the analysis and interpretation of time-dependent and time-lag rockburst of rock damage and failure under high stress level.

Key words: time lag, stress level, deformation characteristics, dissipated energy, failure mode

中图分类号:

TU 451

徐鹏飞, 邓华锋, 张恒宾, 彭萌, 李冠野, 姜桥, 陈兴周, . 不同应力水平下砂岩时滞性单轴压缩破坏特性研究[J]. 岩土力学, 2021, 42(11): 3041-3050.

XU Peng-fei, DENG Hua-feng, ZHANG Heng-bin, PENG Meng, LI Guan-ye, JIANG Qiao, CHEN Xing-zhou, . Time-lag uniaxial compression failure characteristics of sandstone under different stress levels[J]. Rock and Soil Mechanics, 2021, 42(11): 3041-3050.

参考文献

相关文章 15

[1]	苗胜军, 王辉, 杨鹏锦, 王亚欣, . 近疲劳强度循环荷载对泥质石英粉砂岩力学特性影响研究[J]. 岩土力学, 2021, 42(8): 2109-2119.
[2]	王爱文, 高乾书, 潘一山, . 煤层钻孔降倾-控变-耗能防冲机制试验研究[J]. 岩土力学, 2021, 42(5): 1230-1244.
[3]	王东英, 尹小涛, 杨光华, . 悬索桥隧道式锚碇夹持效应的试验研究[J]. 岩土力学, 2021, 42(4): 1003-1011.
[4]	宋宇, 刘保国, 刘浩, 孙景来, 于明圆, 任大瑞, . 基于变形与脆性特性的类岩石材料配比正交试验研究[J]. 岩土力学, 2020, 41(8): 2675-2684.
[5]	高俊, 党发宁, 马宗源. 超高沥青混凝土心墙高应力水平的降低措施研究[J]. 岩土力学, 2020, 41(5): 1730-1739.
[6]	韩超, 庞德朋, 李德建. 砂岩分级加卸载蠕变试验过程能量演化分析[J]. 岩土力学, 2020, 41(4): 1179-1188.
[7]	翟明磊, 郭保华, 王辰霖, 焦峰, . 法向卸荷下贯通裂隙岩样压剪破坏特征研究[J]. 岩土力学, 2019, 40(S1): 217-223.
[8]	张宜虎, 邬爱清, 周火明, 王帅, 罗荣, 范雷. 悬索桥隧道锚承载能力和变形特征研究综述[J]. 岩土力学, 2019, 40(9): 3576-3584.
[9]	夏唐代, 郑晴晴, 陈秀良, . 基于累积动应力水平的间歇加载下超孔压预测[J]. 岩土力学, 2019, 40(4): 1483-1490.
[10]	周辉, 宋明, 张传庆, 卢景景, 刘振江, 史林肯, . 水平层状复合岩体变形破坏特征的围压效应研究[J]. 岩土力学, 2019, 40(2): 465-473.
[11]	刘健, 朱赵辉, 吴浩, 张石磊, 王晋明, . 超大型地下洞室高边墙围岩变形影响特性研究[J]. 岩土力学, 2019, 40(10): 4030-4040.
[12]	董志宏, 钮新强, 丁秀丽, 翁永红, 黄书岭, 裴启涛, 张练, . 乌东德左岸地下厂房洞室群施工期围岩变形特征及反馈分析[J]. 岩土力学, 2018, 39(S2): 326-336.
[13]	杨琪，张友谊，刘华强，秦华，. 一种气泡轻质土路基受载-破坏模型试验[J]. , 2018, 39(9): 3121-3129.
[14]	翟明磊，郭保华，李冰洋，焦峰,. 岩石节理分级剪切加载-蠕变-卸载的能量与变形特征[J]. , 2018, 39(8): 2865-2872.
[15]	段敏克，蒋长宝，俞欢，陆天宇，钮彬炜，孙东玲,. 分级加-卸载条件下原煤的渗透及能耗特征研究[J]. , 2018, 39(4): 1346-1354.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

不同应力水平下砂岩时滞性单轴压缩破坏特性研究

Time-lag uniaxial compression failure characteristics of sandstone under different stress levels

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 10