Creep properties of siltstone-like materials with different unloading confining pressures under seepage

被引:1
|
作者
Zhang, Xiangdong [1 ]
Zhou, Zhongchao [1 ]
Yang, Jianjun [2 ]
Pang, Shuai [1 ]
Geng, Jie [1 ]
Li, Wenliang [1 ]
Zhang, Xuefeng [1 ]
机构
[1] Liaoning Tech Univ, Coll Civil Engn, Fuxin, Liaoning, Peoples R China
[2] China Northeast Architecture Design & Res Inst Co, Shenyang, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
seepage; siltstone-like materials; creep; constitutive model; integrity indices; MODEL;
D O I
10.3389/feart.2022.949916
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Deep enclosing rocks exhibit non-homogeneous characteristics of dense joints and fissure development. Soft rocks subjected to multiple factors, such as high stress and hydrostatic pressure, are prone to damage and significant deformation, which can lead to instability of the surrounding rocks, failure of the supporting structure, and other accidents. In this study, we investigated the creep behaviour of deep soft rocks and siltstone-like materials subjected to different unloading confining pressures coupled with a high stress field and seepage. Subsequently, the laws and behaviours of parameters, such as the transient strain, creep deformation, and creep rate were derived and analysed under various conditions. The results indicate that the radial creep curve exhibits a variation pattern similar to that of the axial creep. However, the extent of radial creep exceeds that of axial creep in soft siltstone-like rocks under unloading confining pressure conditions. We derived expressions for the constitutive relation of siltstone-like specimens under various unloading confining pressure conditions in the presence of seepage using an improved viscoelasticmodel that considered the coupling effect of fissure and seepage flow. The correlation coefficients of the calculated model values with the experimental values, as obtained by the non-linear least-squares fitting, were all above 0.9178, indicating that the proposed model can accurately characterise the creep process in fissured siltstone.
引用
收藏
页数:14
相关论文
共 50 条
  • [31] Experimental study on seepage characteristics of red sandstone with different confining pressures and different damage degrees
    Zhang P.
    Hou J.
    Zhao C.
    Li T.
    [J]. Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering, 2020, 39 (12): : 2405 - 2415
  • [32] Unloading mechanical properties and constitutive model of sandstone under different pore pressures and initial unloading levels
    Liu X.
    Liu J.
    Li D.
    Wang J.
    Wang Z.
    Zhong Z.
    [J]. Li, Dongliang (myheartwillgoon17@126.com), 2017, China Coal Society (42): : 2592 - 2600
  • [33] LONG-TERM CREEP BEHAVIOR OF DEEP-BURIED MARBLE UNDER DIFFERENT CONFINING PRESSURES
    Zha, Ersheng
    Zhang, Ru
    Zhang, Zetian
    Ren, Li
    Zhang, Wenju
    Jia, Zheqiang
    Liu, Yang
    [J]. THERMAL SCIENCE, 2019, 23 : S653 - S660
  • [34] Effect of Bedding Angle and Mineral Composition on Mechanical Properties and Fracture Behavior of Phyllite Under Unloading Confining Pressures
    Guo, Xiaolong
    Tan, Zhongsheng
    Wang, Xiao
    Li, Ang
    Ma, Zhongjun
    Wu, Yongsheng
    [J]. GEOTECHNICAL AND GEOLOGICAL ENGINEERING, 2020, 38 (04) : 3611 - 3621
  • [35] Effect of Bedding Angle and Mineral Composition on Mechanical Properties and Fracture Behavior of Phyllite Under Unloading Confining Pressures
    Xiaolong Guo
    Zhongsheng Tan
    Xiao Wang
    Ang Li
    Zhongjun Ma
    Yongsheng Wu
    [J]. Geotechnical and Geological Engineering, 2020, 38 : 3611 - 3621
  • [36] Deformation characteristics of sandstones during cyclic loading and unloading with varying lower limits of stress under different confining pressures
    Peng, Kang
    Zhou, Jiaqi
    Zou, Quanle
    Yan, Fazhi
    [J]. INTERNATIONAL JOURNAL OF FATIGUE, 2019, 127 : 82 - 100
  • [37] Creep-based permeability evolution in deep coal under unloading confining pressure
    Zhou, H. W.
    Wang, L. J.
    Rong, T. L.
    Zhang, L.
    Ren, W. G.
    Su, T.
    [J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING, 2019, 65 : 185 - 196
  • [38] Mechanical Properties of Rock-like Materials Under Disturbance Loads at Different Lateral Pressures
    Liu, Yonghong
    Zhao, Fujun
    Wu, Qiuhong
    Ye, Zhouyuan
    [J]. Materials, 2024, 17 (22)
  • [39] Experimental Study on Seepage Properties of Postpeak Fractured Rocks under Cyclic Loading-Unloading Confining Stress and Axial Stress
    Zhang, Xiaobo
    Xia, Zuhao
    Yao, Chi
    Yang, Jianhua
    Yang, Mingdong
    [J]. GEOFLUIDS, 2021, 2021
  • [40] Experimental Study on Mechanical Properties of Deep Buried Granite under Different Confining Pressures
    Zhao, Jun
    Zhang, Tan
    [J]. ADVANCES IN CIVIL ENGINEERING, 2020, 2020