不同岩桥角度双裂隙砂岩单轴蠕变试验及三维数值模拟

doi:10.13722/j.cnki.jrme.2022.0872

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摘要为分析不同应力路径下岩桥角度对岩体强度和破坏特征的影响规律，通过制备7种含不同的双裂隙砂岩试样，依次开展常规单轴和单、多级蠕变试验。试验结果显示：对试样的特征应力存在较大影响，但同类型岩体各特征应力之间的比例受的影响较小；各岩体试样的长期强度与对应起裂应力非常接近，可将看成岩体的长期强度，从而只需通过常规压缩试验便可估算岩体值。裂纹扩展方面，相同的试样在4种加载路径下的贯通特点基本一致： ????°～??°试样破坏时岩桥均未贯通，而 ?????°～90°试样则均呈现岩桥直接贯通破坏的模式。表明对裂纹扩展的影响要大于应力路径的影响。另外，部分试样还呈现出表观裂纹和内部裂纹扩展并不一致的现象，鉴于此，基于连续介质单元模拟，提出一种基于塑性应变的裂纹扩展判断方法，并建立三维模型进行计算，模拟结果显示与试验结果较为一致。该方法较传统通过塑性区判断裂纹扩展更为准确，可为岩体裂隙的三维时效扩展模拟提供一定的参考和借鉴。

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关键词 ：岩石力学, 双裂隙砂岩, 单轴蠕变试验, 强度特征, 三维数值模拟

Abstract：To analyse the influence of rock bridge angle on the strength and failure characteristics of rock mass under different stress paths，seven kinds of double flawed sandstone samples with different were prepared，then uniaxial compression tests，single and multi-stage creep tests were carried out. Results show that the rock bridge angle has significant effect on the critical stress，but the ratio of the critical stress of the same sample is less affected by . The long-term strength of the samples is very close to the crack initiation stress ，thus the long-term strength of the rock mass can be estimated only through the conventional compression test. In terms of crack propagation，the penetration characteristics of the same samples under the four loading paths are basically the same：the rock bridge is not penetrated when the samples with ????°–??°are damaged，while the samples with ???60°–90°show the mode of direct penetration failure of the rock bridge. It is shown that the influence of on the crack propagation is greater than that of the stress path. In addition，some samples also show the phenomenon that the apparent crack and the internal crack propagation are not consistent. In view of this，based on the continuous medium element simulation，a crack propagation judgment method based on plastic strain was proposed，and a three-dimensional model was established for calculation. The simulation results show that they are consistent with the test results. This method is more accurate than the traditional method of judging the crack propagation through the plastic zone，and can provide some reference for the three-dimensional time-dependent propagation simulation of rock fracture.

Key words： rock mechanics sandstone with two pre-existing flaws uniaxial creep test strength characteristics three-dimensional numerical simulation

引用本文:

杨超，王娇，董星辰，王乐华，王瑞红. 不同岩桥角度双裂隙砂岩单轴蠕变试验及三维数值模拟[J]. 岩石力学与工程学报, 2023, 42(10): 2466-2477.
YANG Chao，WANG Jiao，DONG Xingchen，WANG Lehua，WANG Ruihong. Uniaxial creep test and three-dimensional numerical simulation of double flawed sandstone with different rock bridge angles. , 2023, 42(10): 2466-2477.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0872 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I10/2466

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