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1.三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002
2.湖北长江三峡滑坡国家野外科学观测研究站, 湖北 宜昌 443002
Received:01 May 2024,
Revised:2024-06-25,
Published:28 October 2025
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王宇,黎瑾,邓华锋等.基于PFC2D模型的卸荷损伤泥岩应力松弛破裂机制[J].防灾减灾工程学报,2025,45(05):1262-1272.
WANG Yu,LI Jin,DENG Huafeng,et al.Stress Relaxation and Rupture Mechanisms of Unloading Damaged Mudstone Based on PFC2D Model[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(05):1262-1272.
王宇,黎瑾,邓华锋等.基于PFC2D模型的卸荷损伤泥岩应力松弛破裂机制[J].防灾减灾工程学报,2025,45(05):1262-1272. DOI: 10.13409/j.cnki.jdpme.20240501001.
WANG Yu,LI Jin,DENG Huafeng,et al.Stress Relaxation and Rupture Mechanisms of Unloading Damaged Mudstone Based on PFC2D Model[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(05):1262-1272. DOI: 10.13409/j.cnki.jdpme.20240501001.
为探明不同卸荷损伤程度下的泥岩应力松弛破裂机制,开展卸荷损伤泥岩的应力松弛数值模拟计算。研究细观参数对宏观力学参数的影响规律,确定细观参数取值范围;采用适合多因素、多计算次数的均匀设计法及多元回归分析,建立泥岩试样基于PFC
2D
平行黏结模型的宏‑细观参数定量关系式,计算确定泥岩PFC
2D
细观参数;利用已获得的细观参数进行卸荷损伤泥岩应力松弛数值模拟计算,并结合试验成果验证。研究结果表明:根据细观能量的演化可将应力松弛划分为低应力松弛、高应力松弛及松弛破坏三个阶段。且前两个阶段主要体现为细观应变能蓄积,最后阶段则表现为细观耗散能释放;卸荷损伤程度增大导致应力松弛过程中剪切裂纹数量显著增加,张拉裂纹数量差异不明显;泥岩应力松弛破坏模式随着卸荷损伤程度增大由张拉贯通破坏为主逐渐向张拉‑剪切复合贯通破坏转化。
To investigate the stress relaxation and rupture mechanisms of mudstone under different degrees of unloading damage
numerical simulation of stress relaxation in unloading damaged mudstone was conducted. The influence pattern
s of mesoscopic parameters on macroscopic mechanical parameters were studied to determine the range of mesoscopic parameter values. The uniform design method suitable for multi-factor and multi-calculation analyses
combined with multiple regression analysis
was used to establish the quantitative relationships between macroscopic and mesoscopic parameters of mudstone samples based on the PFC
2D
parallel bond model
thereby calculating and determining the PFC
2D
mesoscopic parameters of mudstone. Using the obtained mesoscopic parameters
numerical simulations of stress relaxation in unloading damaged mudstone were conducted
and the results were validated against experimental results. The results showed that according to the evolution of mesoscopic energy
stress relaxation could be divided into three stages: low stress relaxation
high stress relaxation
and relaxation failure. Moreover
the first two stages were primarily characterized by the accumulation of mesoscopic strain energy
while the final stage was characterized by the release of mesoscopic dissipation energy. As the degree of unloading damage increased
the number of shear cracks significantly increased during stress relaxation
while the difference in the number of tensile cracks remained insignificant. The failure mode of mudstone during stress relaxation gradually transitioned from tension penetration failure to tension-shear composite penetration failure as the degree of unloading damage increased.
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