文献类型：期刊文献

英文题名：Impact of structural anisotropy on compressive creep behaviors of composite rocks based on digital image correlation technology

作者：Tian, Hongming[1];Shu, Xiaoyun[1,2];Chen, Weizhong[1];Tan, Xianjun[1];Yang, Diansen[1];Tian, Yun[3,4]

机构：[1]Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China;[2]Hohai Univ, Coll Civil & Transportat Engn, Nanjing 210024, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Zhejiang 312000, Peoples R China

年份：2024

卷号：83

期号：8

外文期刊名：BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:001262287500003)、、EI(收录号：20242816667759)、Scopus(收录号：2-s2.0-85197555995)、WOS

基金：The authors gratefully acknowledge the support of National Natural Science Foundation of China (Grant Nos. 42293355, 52179113, 52279119 and U2340229), and Science and Technology Planning Project of Xizang Autonomous Region (Grant No. XZ202201ZY0021G).

语种：英文

外文关键词：Creep test; Anisotropy; Composite rock; Digital image correlation

外文摘要：Anisotropic creep behaviors of the composite rocks significantly affect the long-term stability of the deep tunnels in those rocks. To investigate the influences of structural anisotropy on creep behaviors of composite rocks, a series of uniaxial creep tests were conducted on composite rock-like specimens with different dip angles. The rock-like specimens were manufactured by three-dimensional printed (3DP) method to avoid high variability of natural rocks. The Burgers model was used to fit the creep curves of the composite rock, and the fitting results showed that the transient creep parameter Ek (elastic module of the Kelvin element) exhibited an increasing order-shaped anisotropy with increasing dip angle under low creep stress levels, while, the steady-state creep parameter eta m (viscosity coefficient of the Maxwell element) showed a U-shaped anisotropy under high creep stress level. The digital image correlation (DIC) technology was used to capture the distribution and evolution of the full-field creep strain of the composite rock, and the observations showed that the anisotropic creep behaviors of composite rock were related to the strain concentration along the soft layers, and enhanced by the time-dependent shear slip between the soft layers and the hard material under high creep stress.