Nonlinear shear constitutive model for peak shear-type joints based on improved Harris damage function

• Autorzy: Xie Shijie , Lin Hang , Wang Yixian , Cao Rihong , Yong Rui , Du Shigui , Li Jiangteng

Identyfikatory

DOI

10.1007/s43452-020-00097-z

• Języki publikacji: EN

Abstrakty

EN

The majority of jointed rock mass failures mainly occur along the joints in shear mode, which promotes a wide investigation on the proposal of a reasonable and reliable shear constitutive model of rock joints. In this paper, based on Improved Harris function and laboratory shear tests, a new constitutive model of saw-tooth joints was proposed. Firstly, a series of laboratory direct shear tests were carried out on saw-tooth joint specimens made of rock-like materials (cement mortar) to obtain the shear stress-displacement curves. Subsequently, the test results were divided into sliding failure type and peak shear type according to whether there is a significant stress drop between peak stress and residual stress. It is assumed that rock elements can be divided into undamaged parts and damaged parts during the shearing process. The stress-displacement relation of the undamaged part satisfies Hooke’s law, while the damaged part provides residual stress. Via the comparison with commonly used micro-element failure probability density functions, the Improved Harris distribution function was selected as the standard to characterize the strength of micro rock units. Finally, derived from the theory of damage statistical mechanics, a damage statistical constitutive model was proposed, which can reflect the deformation characteristics of rock joints. Compared with previous models and experimental data, the model proposed in this paper can represent the trend of peak shear curve variation with higher accuracy, the parameters are easy to be solved and have obvious physical significance, which verifies the advantages and applicability of this model.

Słowa kluczowe

EN

joint; direct shear test; constitutive model; statistical damage theory; improved Harris distribution

PL

połączenie; ścinanie; uszkodzenie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 3
• Strony: 454--467
• Opis fizyczny: Bibliogr. 40 poz., fot., rys., wykr.

Twórcy

autor

Xie Shijie

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

autor

Lin Hang

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

autor

Wang Yixian

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

autor

Cao Rihong

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

autor

Yong Rui

• School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang 315211, China

autor

Du Shigui

• School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang 315211, China

autor

Li Jiangteng

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

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)