Study on Creep Characteristics and Constitutive Relation of Fractured Rock Mass

المؤلفون المشاركون

Ma, Depeng
Li, Kesheng
Li, Maotong
Liu, Chuanxiao
Zhang, Deng

المصدر

Shock and Vibration

العدد

المجلد 2020، العدد 2020 (31 ديسمبر/كانون الأول 2020)، ص ص. 1-14، 14ص.

الناشر

Hindawi Publishing Corporation

تاريخ النشر

2020-09-25

دولة النشر

مصر

عدد الصفحات

14

التخصصات الرئيسية

هندسة مدنية

الملخص EN

In order to effectively describe the whole creep process of fractured rock mass, triaxial unloading creep tests were carried out on prefractured coal samples using constant axial pressure and graded unloading confining pressure, and the axial and lateral creep laws of fractured coal samples with different dip angles were studied.

Combined with the characteristics of creep curve and based on Kachanov’s creep damage theory, the damage variable is introduced into the constitutive relation and creep equation, and the evolution equation of damage variable with time in the whole creep process is derived.

At the same time, a new method to calculate the initial damage is proposed.

The elastoplastic body with damage variable is connected with the Burgers model in series.

Meanwhile, lade criterion and switch element are introduced into the creep model to establish a new fracture damage creep model.

The one-dimensional and three-dimensional damage creep equations are derived.

The damage creep equation is obtained according to the superposition principle.

A simple and feasible method for parameter identification of the model is given based on the characteristics of creep curve.

The applicability of the model is verified by comparing the creep test curve of fractured coal sample with the theoretical curve.

The results show that the two models are in good agreement.

The model can not only accurately reflect the nonlinear characteristics of creep curves in the attenuation and isokinetic stages but also describe the accelerated creep characteristics of fractured rocks.

نمط استشهاد جمعية علماء النفس الأمريكية (APA)

Li, Maotong& Li, Kesheng& Zhang, Deng& Liu, Chuanxiao& Ma, Depeng. 2020. Study on Creep Characteristics and Constitutive Relation of Fractured Rock Mass. Shock and Vibration،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1212799

نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)

Li, Maotong…[et al.]. Study on Creep Characteristics and Constitutive Relation of Fractured Rock Mass. Shock and Vibration No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1212799

نمط استشهاد الجمعية الطبية الأمريكية (AMA)

Li, Maotong& Li, Kesheng& Zhang, Deng& Liu, Chuanxiao& Ma, Depeng. Study on Creep Characteristics and Constitutive Relation of Fractured Rock Mass. Shock and Vibration. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1212799

نوع البيانات

مقالات

لغة النص

الإنجليزية

الملاحظات

Includes bibliographical references

رقم السجل

BIM-1212799