A New Strain-Softening Constitutive Model for Circular Opening considering Plastic Bearing Behavior and Its Engineering Application

Joint Authors

Mao, Xianbiao
Chen, Liang
Zhou, Wei
Li, Ming

Source

Mathematical Problems in Engineering

Issue

Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-13, 13 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2018-07-02

Country of Publication

Egypt

No. of Pages

13

Main Subjects

Civil Engineering

Abstract EN

Geomaterials generally show strain-softening characteristics after peak-load.

Based on the triaxial test for sandy mudstone, a simple elastopeak plastic-strain-softening-damage model (EPSDM) was proposed.

Compared with the traditional strain-softening model, EPSDM shows obvious plastic bearing characteristics before strain softening.

Then, the closed-formed solution of circular opening was deduced based on the newly proposed model.

A plastic shear strain increment was introduced as the extension constraint condition of peak plastic zone.

The solution correctness of EPSDM was also verified by comparing with other research results.

In addition, the solution based on EPSDM could degenerate for a series of results obtained by elastobrittle plastic model (EBM), elasto-strain-softening model (ESM), and elasto-perfectly plastic model (EPM) under certain conditions.

Hence, it could be regarded as a unified solution.

Finally, the research results denoted that when the inner pressure was fully released, the maximum postpeak failure radii and surface displacement of surrounding rock indicated the characteristics of EBM>ESM>EPSDM>EPM.

Therefore, the plastic bearing behavior could effectively decrease the postpeak failure zone radii and surface displacement.

The dilation coefficient noticeably influenced postpeak failure range and surface displacement, particularly the damage zone radii and tunnel wall convergence.

The research results can provide very important theoretical bases for evaluating the tunnel stability and support design reliability for underground engineering.

American Psychological Association (APA)

Chen, Liang& Mao, Xianbiao& Li, Ming& Zhou, Wei. 2018. A New Strain-Softening Constitutive Model for Circular Opening considering Plastic Bearing Behavior and Its Engineering Application. Mathematical Problems in Engineering،Vol. 2018, no. 2018, pp.1-13.
https://search.emarefa.net/detail/BIM-1207486

Modern Language Association (MLA)

Chen, Liang…[et al.]. A New Strain-Softening Constitutive Model for Circular Opening considering Plastic Bearing Behavior and Its Engineering Application. Mathematical Problems in Engineering No. 2018 (2018), pp.1-13.
https://search.emarefa.net/detail/BIM-1207486

American Medical Association (AMA)

Chen, Liang& Mao, Xianbiao& Li, Ming& Zhou, Wei. A New Strain-Softening Constitutive Model for Circular Opening considering Plastic Bearing Behavior and Its Engineering Application. Mathematical Problems in Engineering. 2018. Vol. 2018, no. 2018, pp.1-13.
https://search.emarefa.net/detail/BIM-1207486

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1207486