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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (9): 1734-1743    DOI: 10.3785/j.issn.1008-973X.2021.09.015
    
Macro-mesoscopic Duncan-Chang damage model for hydrate-bearing sediments considering coupling effect of temperature-pore pressure condition
Hui WANG1(),Xiao-lin HUAN1,Yu-qi CHEN1,Bo ZHOU1,*(),Shi-feng XUE1,Ying-song LIN2
1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
2. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
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Abstract  

A new temperature-pressure state parameter was defined in order to reflect the influence of temperature-pressure environment on the mechanical properties of hydrate-bearing sediments. Based on the mechanism of temperature-pressure environment on the mesoscopic structure of the sediments, a multi-scale elastic parameter prediction model was proposed by using the three-phase sphere model considering the influence of temperature-pressure environment on the mesoscopic components and the contact interface of each component. Then, based on the traditional Duncan-Chang model and the statistical damage theory, a Duncan-Chang statistical damage model was established by introducing the ultimate damage value. The validity and reasonability of the proposed model were verified by comparing the triaxial tests data of hydrate-bearing sediments under different temperature and pore pressure conditions with the predicted results of the model. Results show that the model can take into account the effects of hydrate saturation, temperature and pore pressure environment, grain size grading of sediments skeleton. It can well simulate the stress-strain characteristics of hydrate-bearing sediments under different temperature and pore pressure environments.

Key words： hydrate-bearing sediments      temperature and pore pressure state parameter      Duncan-Chang constitutive model      statistical damage      ultimate damage     
Received: 12 October 2020      Published: 20 October 2021
CLC:  TE 133  
Fund:  国家重点研发计划资助项目(2017YFC0307604)
Corresponding Authors: Bo ZHOU     E-mail: upc_wanghui@163.com;zhoubo@upc.edu.cn
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Hui WANG
Xiao-lin HUAN
Yu-qi CHEN
Bo ZHOU
Shi-feng XUE
Ying-song LIN
Cite this article:

Hui WANG, Xiao-lin HUAN, Yu-qi CHEN, Bo ZHOU, Shi-feng XUE, Ying-song LIN. Macro-mesoscopic Duncan-Chang damage model for hydrate-bearing sediments considering coupling effect of temperature-pore pressure condition. Journal of ZheJiang University (Engineering Science), 2021, 55(9): 1734-1743.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.09.015     OR     https://www.zjujournals.com/eng/Y2021/V55/I9/1734


考虑温—压耦合影响的水合物沉积物宏细观Duncan-Chang损伤模型

为了反映温—压环境对水合物沉积物力学特性的影响，定义新的温—压状态参数. 从温—压环境对沉积物细观结构的作用机制出发，采用三相球模型提出考虑温—压环境对水合物沉积物细观各组分和各组分间接触界面影响的多尺度弹性参数预测模型. 基于传统Duncan-Chang模型与统计损伤理论，引入极限损伤值，建立Duncan-Chang统计损伤模型. 对比在不同温—压环境条件下水合物沉积物的三轴试验结果与模型预测结果，验证所提模型的有效性和合理性. 结果表明：该模型能够考虑水合物饱和度、温—压环境以及沉积物骨架的粒径级配影响，能够较好地模拟水合物沉积物在不同温—压环境下应力—应变全过程.


关键词： 水合物沉积物,  温?压状态参数,  Duncan-Chang模型,  统计损伤,  极限损伤 
Fig.1 Schematic diagram of mesoscopic contact of hydrate-bearing sediments
Fig.2 Methane hydrate phase equilibrium curve
Fig.3 Schematic diagram of the homogenization process of hydrate-bearing sediments
Fig.4 Relationship between volume modulus of liquid water in pores and temperature and pore pressure
Fig.5 Toyoura sand particle size distribution curve
Fig.6 Relationship between elastic modulus of methane hydrate and state parameters of temperature and pore pressure
ξ SMH/% φMH/% F0 m
0.971 0 0 0 18.183 0 1.949 1
0.971 0 26.6 11.69 21.359 4 3.731 3
0.971 0 46.6 18.85 28.047 9 5.422 5
Tab.1 Model parameters with different hydrate saturation
σ3/MPa SMH/% φMH/% F0 m
1 34.8 0.147 6 10.894 4 4.574 4
2 34.8 0.147 6 16.695 5 3.809 9
3 34.8 0.147 6 22.361 9 2.908 9
Tab.2 Model parameters under different confining pressure
ξ SMH/% φMH/% F0 m
0.957 0 23.2 10.35 27.297 1 4.393 3
0.965 6 23.2 10.35 22.533 3 4.091 9
0.971 0 24.7 10.95 18.896 6 3.726 8
0.971 0 46.6 18.85 29.168 8 4.591 3
0.991 3 42.5 17.45 23.110 3 3.427 5
Tab.3 Model parameters under different P-T condition
Fig.7 Comparison between experimental results and calculated results of stress-strain curves of hydrate-bearing sediments at different conditions
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