›› 2018, Vol. 39 ›› Issue (S1): 9-20.doi: 10.16285/j.rsm.2017.2320

• 基础理论与实验研究 • 上一篇    下一篇

考虑统计损伤模型的非均质节理岩体拉剪破坏机制研究

刘 港1,2,3,马凤山1,2,赵海军1,2,冯雪磊1,2,3,郭 捷1,2   

  1. 1. 中国科学院地质与地球物理研究所 中国科学院页岩气与地质工程重点实验室,北京 100029; 2. 中国科学院地球科学研究院,北京 100029;3. 中国科学院大学,北京 100049
  • 收稿日期:2017-11-21 出版日期:2018-07-20 发布日期:2018-09-02
  • 通讯作者: 马凤山,男,1964年生,硕士,研究员,博士生导师,主要从事地质工程与地质灾害研究工作。E-mail: fsma@mail.iggcas.ac.cn E-mail:liugang_iggcas@163.com
  • 作者简介:刘港,男,1990年生,博士研究生,从事工程地质与岩石力学研究.
  • 基金资助:

    中国科学院战略性先导科技专项(B类)(No. XDB10030602),国家自然科学基金项目(No. 41772341, No. 41372325, No. 41372323)。

Failure mechanisms study of heterogeneous jointed rock mass considering statistical damage model in tensile-shear test

LIU Gang1,2,3, MA Feng-shan1,2, ZHAO Hai-jun1,2, FENG Xue-lei1,2,3, GUO Jie1,2   

  1. 1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-11-21 Online:2018-07-20 Published:2018-09-02
  • Supported by:

    This work was supported by the CAS Strategic Priority Research Program(B)(XDB10030602) and the National Natural Science Foundation of China (41772341, 41372325, 41372323).

摘要: 拉剪应力状态极易导致岩体破坏乃至失稳,为研究节理岩体拉剪破坏规律,开展了拉剪荷载下共面非贯通节理岩体变形破坏的理论与数值计算研究。通过自定义考虑岩石统计损伤演化的Mohr-Coulomb和最大拉应力准则模型,编写力学参数服从Weibull分布的fish函数,研究了拉剪条件下非均质节理岩体的破坏模式及破坏规律,讨论了岩石均质度、法向拉应力及剪切速率对岩体破坏模式及其力学性质的影响。结果表明,(1) 拉剪应力状态下节理岩体的破坏模式以张拉破坏为主,加载初期破坏位置分布散乱,随着加载和损伤演化逐渐形成带状破裂面,岩体宏观力学性质明显降低;(2) 非均质性对岩体破坏影响显著,主要表现为均质度的增加,岩体由弥散型破坏向集中型破坏转变,破裂面起伏度增大,同时岩体的宏观力学性质增强并最终趋向于均质岩体;(3) 低应力水平下拉应力增大不改变节理岩体以拉张破坏为主的破裂模式,但剪切破坏比例明显减少,同时岩体抗剪强度降低,破裂面的粗糙度增大;(4) 剪切速率对岩体力学性质的影响显著,静态加载范围内岩体抗剪强度随剪切速率的增大而增大,且增幅越来越小。

关键词: 统计损伤模型, 非均质, 拉剪荷载, 共面非贯通节理, 岩体破坏

Abstract: The state of tensile-shear stress can easily lead to rock mass damage and even instability. To investigate the tensile-shear failure law of jointed rock mass, numerical simulation of rock mass containing coplanar intermittent cracks under tensile-shear test is carried out through FLAC3D simulation software. For getting high fidelity actual conditions, Mohr-Coulomb constitutive model and maximum tensile stress criterion are amended with rock statistical damage and a function is applied to make the initial mechanical parameters obey the Weibull distribution. Then, failure modes and laws of rock mass are studied under tensile-shear loading. And the influence of homogeneous degree, normal tensile stress and shear rate on rock mass failure modes and processes, as well as its mechanical properties were discussed. The main conclusions can be drawn as follows: (1) Due to the heterogeneous characteristics of natural rock mass, the failure mode is dominated by tensile failure, with little tensile-shear mixed failure. Meanwhile, the initial rupture zones are scattered and then form a strip-shaped fracture surface. The macroscopic mechanical properties of heterogeneous rock mass are obviously weakened than homogeneous rock mass without damage evolution. (2) Heterogeneity has a significant impact on the failure process and strength of jointed rock mass. That is, with the increase of homogeneous degree, the failure mode changes from diffuse type to the concentrated, and the rupture surface roughness increases. The macroscopic strength of jointed rock mass enhances, but there is a ceiling which represents strength of the homogeneous. (3) Under the low stress level, the increase of tensile stress does not change the main rupture mode of rock mass which is tensile failure. However, the proportion of shear and mixed failure are obviously less. Meanwhile, the shear strength of rock mass decreases and the roughness of fracture surface increases. (4) The shear rate has a significant effect on the mechanical properties of rock mass. In the static loading range, the shear strength of rock mass increases with the growth of shearing rate, and the magnitude of the increase is getting smaller.

Key words: statistical damage model, heterogeneity, tensile-shear load, coplanar intermittent crack, rock mass failure

中图分类号: 

  • TU 452

[1] 李利平, 朱宇泽, 周宗青, 石少帅, 陈雨雪, 屠文锋. 隧道突涌水灾害防突厚度计算方法及适用性评价[J]. 岩土力学, 2020, 41(S1): 41-50.
[2] 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.
[3] 王钦科, 马建林, 陈文龙, 杨彦鑫, 胡中波, . 上覆土嵌岩扩底桩抗拔承载特性离心 模型试验及计算方法研究[J]. 岩土力学, 2019, 40(9): 3405-3415.
[4] 金丹丹, 王 素, 李传勋. 考虑起始水力坡降的天然非均质地基固结分析[J]. 岩土力学, 2019, 40(4): 1433-1440.
[5] 王 珍, 曹兰柱, 王 东, . 非均质边坡稳定性上限分析评价研究[J]. 岩土力学, 2019, 40(2): 737-742.
[6] 刘 建,赵国彦,梁伟章,吴 浩,彭府华,. 非均匀岩石介质单轴压缩强度及变形破裂规律的数值模拟[J]. , 2018, 39(S1): 505-512.
[7] 许 度,冯夏庭,李邵军,吴世勇,邱士利,周扬一,高要辉,. 基于三维激光扫描的锦屏地下实验室岩体变形破坏特征关键信息提取技术研究[J]. , 2017, 38(S1): 488-495.
[8] 吴祚菊,张建经,王志佳,吴兴序,汪明元,. 地震动场地放大效应的时频特性分析[J]. , 2017, 38(3): 685-965.
[9] 高 帅,魏 宁,李小春,雷宏武,刘明泽,. 层状非均质性对CO2在盖层中迁移泄漏规律的影响[J]. , 2017, 38(11): 3287-3294.
[10] 尹训强,袁文志,王桂萱. 复杂非均质场地条件下核电厂HPX泵房的静动力联合分析[J]. , 2016, 37(S2): 745-752.
[11] 梁 桥,杨小礼,张佳华,周文权, . 非均质土体中盾构隧道开挖面支护力上限分析[J]. , 2016, 37(9): 2585-2592.
[12] 霍吉祥,宋汉周. 去耦合方法求解非均质地区地下水中多组分反应-运移模型[J]. , 2015, 36(S2): 57-63.
[13] 蔡国军,虞修竟. 锶、铀在非均质含水层中迁移特性试验研究[J]. , 2015, 36(S2): 345-350.
[14] 加 瑞 ,张稳军 ,  . ND-CPT测量非均质地层密度剖面的研究[J]. , 2015, 36(S1): 685-690.
[15] 胡松山 ,童申家 ,刘斌清 ,谭 华 ,覃润浦 , . 基于非均质边坡强度折减法的三维桥基边坡稳定性分析[J]. , 2014, 35(S2): 653-661.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!