颗粒破碎对水合物沉积物基质宏-细观力学特性影响的离散元分析

徐爽; 徐佳琳; 许成顺; 焦爽

doi:10.19912/j.0254-0096.tynxb.2023-0211

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太阳能学报 ›› 2024, Vol. 45 ›› Issue (6) : 680-690. DOI: 10.19912/j.0254-0096.tynxb.2023-0211

颗粒破碎对水合物沉积物基质宏-细观力学特性影响的离散元分析

徐爽¹, 徐佳琳^1,2, 许成顺¹, 焦爽¹

作者信息 +

DISCRETE ELEMENT ANALYSIS OF EFFECT OF PARTICLE BREAKAGE ON MACROSCOPIC AND MICROSCOPIC MECHANICAL PROPERTIES OF HYDRATE-BEARING SEDIMENT MATRICES

Xu Shuang¹, Xu Jialin^1,2, Xu Chengshun¹, Jiao Shuang¹

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摘要

基于“颗粒碎片替换法”建立反映颗粒破碎行为的含水合物沉积物基质离散元模型,与不破碎模型开展对比三轴剪切试验,证明颗粒破碎对强度和剪胀特征具有重要影响。进而应用“粒径膨胀法”提高模型对体应变和颗粒破碎程度的模拟效果,通过一系列低-高有效围压下的模拟三轴排水剪切试验,研究高应力范围及剪切过程中细观力学特征的演化。结果表明：随着有效围压逐渐增大,试样强度、刚度和平均法向接触力均增大,力链网络更加密集且由环状演变为以竖向为主,试样顶部与底部沿轴向运动的颗粒数量增加。颗粒破碎主要发生在剪切初期,力学配位数、平均法向接触力随剪切进行逐渐增大,剪切后期出现贯穿试样的强力链结构,颗粒运动逐渐从杂乱无章变为由顶、底两端向内,试样内部逐渐出现近似“X”形的剪切带。

Abstract

Based on "particle fragmentation replacement method", a discrete element model is developed for hydrate-bearing sediment matrices, which can reflect the behavior of particle breakage. A comparative triaxial shear test is conducted for breakable and non-breaking models, demonstrating that particle breakage has significantly influence on the strength and shear dilatancy characteristics. In addition, the "particle size expansion method" is applied to improve the simulation effect of the model on the volumetric strain and particle breakage degree. A series of simulated triaxial drainage shear tests are conducted under low and high effective confining pressures to evaluate the meso-mechanical characteristics. The results show that with the increase in the effective confining pressure, the strength, stiffness and average normal contact force of the specimen increase, and the force chain gradually is strengthened. The force chain network becomes denser and changes from annular to vertical, while the particles moving along the axial direction at both ends of the sample increase. The particle breakage primarily occurs during the early shearing. The mechanical coordination number and average normal contact force gradually increase with shearing. At the end of the shearing, A strong chain structure and an "X" shape shear band emerges within the sample, and the particles' motion varies from chaotic to top- and bottom-inward.

导出引用

徐爽, 徐佳琳, 许成顺, 焦爽. 颗粒破碎对水合物沉积物基质宏-细观力学特性影响的离散元分析[J]. 太阳能学报. 2024, 45(6): 680-690 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0211

Xu Shuang, Xu Jialin, Xu Chengshun, Jiao Shuang. DISCRETE ELEMENT ANALYSIS OF EFFECT OF PARTICLE BREAKAGE ON MACROSCOPIC AND MICROSCOPIC MECHANICAL PROPERTIES OF HYDRATE-BEARING SEDIMENT MATRICES[J]. Acta Energiae Solaris Sinica. 2024, 45(6): 680-690 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0211

中图分类号： TU431

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