›› 2016, Vol. 37 ›› Issue (11): 3079-3088.doi: 10.16285/j.rsm.2016.11.006

• 基础理论与实验研究 • 上一篇    下一篇

基于裂纹体应变的深埋大理岩加、卸荷破坏机制研究

纪维伟1,潘鹏志1, 2,苏方声1, 2,杜梦萍1   

  1. 1.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2.中国科学院大学,北京 100049
  • 收稿日期:2015-12-28 出版日期:2016-11-11 发布日期:2018-06-09
  • 通讯作者: 潘鹏志,男,1976年生,研究员,主要从事多场耦合下岩体连续-非连续变形破坏机制与模拟方法研究。E-mail: pzpan@whrsm.ac.cn E-mail:weiweiji@hotmail.com
  • 作者简介:纪维伟,男,1988年生,硕士,主要从事岩石断裂力学的研究工作。
  • 基金资助:

    国家自然科学基金(No. 51322906,No. 41272349);中国科学院前沿科学重点研究项目(No. QYZDB-SSW-DQC029)。

Failure mechanism of deep-buried marble under loading-unloading conditions based on crack volumetric strain

JI Wei-wei1, PAN Peng-zhi1, 2, SU Fang-sheng1, 2, DU Meng-ping1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing, China 100049
  • Received:2015-12-28 Online:2016-11-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(51322906, 41272349) and the Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-DQC029).

摘要: 为了弄清深埋硬岩的加、卸荷破坏机制,系统开展了深埋大理岩的常规三轴试验、保持 不变的卸围压试验和变 的卸围压试验等。以裂纹体应变为主要分析变量,结合体应变、等效塑性应变等参量深入分析上述不同应力路径下硬岩的破坏过程。运用裂纹体应变-轴向应变曲线、等效塑性应变-轴向应变曲线和轴向应力-应变曲线来解释岩石破坏过程所产生的现象与规律。结果表明:在裂纹闭合阶段岩样裂纹闭合的变化程度(裂纹体应变改变的大小)可以反映岩石的初始损伤程度;裂纹闭合阶段对岩石弹性模量的计算有重要的影响,需要根据合适的阶段划分,消除裂纹闭合阶段对弹性模量计算的影响,进而得到较为准确的弹性模量;在卸围压点处岩石的可闭合程度突然增加,裂纹体应变-轴向应变曲线发生突变;岩石卸荷破坏过程中裂纹扩展存在滞后性。研究成果有助于进一步理解深埋硬岩的加、卸荷破坏过程和机制,为深埋隧洞的灾害防治提供理论依据。

关键词: 裂纹体应变, 深埋硬岩, 大理岩, 破坏机制, 加、卸荷

Abstract: To explore the failure mechanism of deep-buried hard rock, a series of experiments was performed, including conventional triaxial tests and the compression tests by decreasing the confining pressure under constant or variable axial stress. The crack volumetric strain is selected as the key analysis variable, and using volumetric strain, crack volume strain and equivalent plastic strain, the rock failure process is analyzed under different stress paths. The phenomena and characteristics of rock failure process are clarified by using the volume strain-axial strain curve of the cracks, the equivalent plastic strain-axial strain curve and the axial stress-strain curve. It is shown that the crack volumetric strain can be used to reflect the extent of rock initial damage, the crack closure has an important influence on the calculation of elastic modulus of rock, and to obtain accurate modulus, the crack closure needs to be divided into appropriate stages to eliminate the influence of the crack closure stage on the elastic modulus calculation. In addition, at the moment that the confining pressure decreases, the cracks of rock sample are closed suddenly, leading to a mutation of the volumetric strain-axial strain curves of the cracks. There exists hysteresis in the crack growth during the unloading failure of rock. The above results can help understand the process of rock failure, while providing a theoretical basis for preventing the failure of hard rock under high stress conditions.

Key words: crack volume strain, deep-buried hard rock, marble, failure mechanism, loading and unloading

中图分类号: 

  • TU 45

[1] 王创业, 常新科, 刘沂琳, 郭文彬, . 单轴压缩条件下大理岩破裂过程声发射频谱 演化特征实验研究[J]. 岩土力学, 2020, 41(S1): 51-62.
[2] 杨括宇, 陈从新, 夏开宗, 宋许根, 张伟, 张褚强, 王田龙. 崩落法开采金属矿巷道围岩破坏机制的断层效应[J]. 岩土力学, 2020, 41(S1): 279-289.
[3] 赵军, 郭广涛, 徐鼎平, 黄翔, 胡偲, 夏跃林, 张頔. 三轴及循环加卸载应力路径下深埋 硬岩变形破坏特征试验研究[J]. 岩土力学, 2020, 41(5): 1521-1530.
[4] 杨峰, 何诗华, 吴遥杰, 计丽艳, 罗静静, 阳军生. 非均质黏土地层隧道开挖面稳定运动 单元上限有限元分析[J]. 岩土力学, 2020, 41(4): 1412-1419.
[5] 冯君, 王洋, 吴红刚, 赖冰, 谢先当, . 玄武岩纤维复合材料土层锚杆抗拔性能 现场试验研究[J]. 岩土力学, 2019, 40(7): 2563-2573.
[6] 丛 怡, 丛 宇, 张黎明, 贾乐鑫, 王在泉, . 大理岩加、卸荷破坏过程的三维颗粒流模拟[J]. 岩土力学, 2019, 40(3): 1179-1186.
[7] 曾严谨,荣 冠,彭 俊,沙 松, . 高温循环作用后大理岩裂纹扩展试验研究[J]. , 2018, 39(S1): 220-226.
[8] 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.
[9] 马 凯,尹立明,陈军涛,陈 明,王自起,崔博强,. 深部开采底板隔水关键层受局部高承压水作用破坏理论分析[J]. , 2018, 39(9): 3213-3222.
[10] 郭昭胜,贺武斌,白晓红. 桩-承台-土复合受力体的拟静力模型试验[J]. , 2018, 39(9): 3321-3330.
[11] 马旭强,施锡林,尹洪武,杨春和,李银平,马洪岭,. 三轴压缩下含夹层盐岩破坏机制[J]. , 2018, 39(2): 644-650.
[12] 李 韬,徐奴文,戴 峰,李天斌,樊义林,李 彪,. 白鹤滩水电站左岸坝肩开挖边坡稳定性分析[J]. , 2018, 39(2): 665-674.
[13] 滕尚永, 杨圣奇, 黄彦华, 田文岭, . 裂隙充填影响巴西圆盘抗拉力学特性试验研究[J]. 岩土力学, 2018, 39(12): 4493-4507.
[14] 张妹珠,江 权,王雪亮,冯夏庭,钟 山,刘 畅, . 破裂大理岩锚注加固试样的三轴压缩试验及加固机制分析[J]. , 2018, 39(10): 3651-3660.
[15] 张 闯,唐建新,腾俊洋,李臣林.. 孔洞数量及孔径对大理岩力学特性影响的试验研究[J]. , 2017, 38(S2): 41-50.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!