Creep damage model of rock mass under multi-level creep load based on spatio-temporal evolution of deformation modulus

• Autorzy: Zhang Xing , Lin Hang , Wang Yixian , Zhao Yanlin

Identyfikatory

DOI

10.1007/s43452-021-00224-4

• Języki publikacji: EN

Abstrakty

EN

To study the damage characteristics of rock mass under multi-level creep load, damage variable D was defined based on the spatio-temporal evolution characteristics of deformation modulus E, and the Kachanov damage theory is used to describe the damage evolution, then the damage evolution equation of the rock mass under multi-level creep load is obtained. Combining the damage evolution equation with the Lemaitre strain equivalence principle, the creep damage constitutive model of rock mass under multi-level creep load considering initial damage is obtained. By comparing the results of uniaxial and triaxial tests with the calculated values of the model, the rationality, reliability, application range of the model proposed in this paper is verified. According to the results of parameter inversion, obtain the relationship between damage, stress and time. Results show that time and stress are the important factors influencing the damage of rock mass under multi-level creep loading, the damage increases with time and stress level. However, the influence of time and stress on damage has a significant stress response characteristics: under low stress, the instantaneous damage Dis caused by the instantaneous stress loading is the main reason for the damage. With the increase of the load level, the main cause of the damage gradually changes from the instantaneous loading of the stress to the creep accumulation of the damage, and the greater the initial damage, the higher the time-dependent damage DiT proportion in the global damage.

Słowa kluczowe

EN

rheology; multi-level load; creep damage model; initial damage; parameter inversion

PL

reologia; obciążenie; uszkodzenie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2021
• Tom: Vol. 21, no. 2
• Strony: 508--523
• Opis fizyczny: Bibliogr. 44 poz., tab., wykr.

Twórcy

autor

Zhang Xing

• School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

autor

Lin Hang

• School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

• https://orcid.org/0000-0002-5924-5163

autor

Wang Yixian

• School of Civil Engineering, Hefei University of Technology, Hefei 230009, China

autor

Zhao Yanlin

• School of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China

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