岩石类材料裂纹扩展贯通的近场动力学方法模拟

doi:10.13722/j.cnki.jrme.2016.0900

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摘要在连续体内引入预制裂纹的数学描述，运用近场动力学方法对含有预制裂隙(不同倾角的单裂缝和不同岩桥倾角的三裂缝)的岩石类材料试件的单轴压缩试验进行数值模拟。结果表明，随着裂缝倾角的增加，翼型裂纹出现的位置逐渐向预制裂隙的两端移动，次生共面剪切裂纹与次生倾斜裂纹出现的时间与形态也随之改变；不同倾角的岩桥呈现的断裂贯通形式有着明显的差异，但裂纹均是在预制裂缝尖端首先产生，随后逐渐扩展贯通，最终导致试件的整体失稳破坏。数值模拟与室内试验结果的对比分析表明近场动力学方法可以很好地模拟岩石类材料的裂纹扩展贯通形态，反映裂隙扩展的基本力学机制；作为一种新的非局部数值模型，其在岩石材料与岩体工程数值研究领域具有广阔的应用前景。

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关键词 ：岩石力学, 近场动力学方法, 岩石类材料, 裂纹扩展贯通

Abstract：By introducing the mathematical description of cracks into the continuum medium，numerical simulations are performed via the peridynamic method on crack propagation inside the specimen of rock-like materials. The case of one pre-existing fissure with different dip angles and that of three pre-existing fissures with different rock bridge angles are taken into account under the condition of uniaxial compression. It is seen that with the increasing of dip angle，the nucleation position of wing cracks is gradually moved to the ends of the pre-existing fissures. The emergence time and shape of the secondary coplanar shear cracks and the secondary inclined cracks change accordingly；there exists an obvious difference in the form of fracture coalescence for rock bridge with different dip angles，but all the cracks initiate at the ends of pre-existing fissure，then gradually propagate and coalesce，leading to a final failure of the specimen. Comparisons between the simulation results and the laboratory tests on sandstone specimens show that the peridynamic method，as a new nonlocal numerical technique，is quite suitable for simulating the problem of crack propagation，and presents a broad interest in investigating rock materials and rock structures.

Key words： rock mechanics peridynamic method rock-like materials crack propagation and coalescence

引用本文:

朱其志1，2，倪涛1，2，赵伦洋1，2，袁双双1，2. 岩石类材料裂纹扩展贯通的近场动力学方法模拟[J]. 岩石力学与工程学报, 2016, 35(S2): 3507-3515.
ZHU Qizhi1，2，NI Tao1，2，ZHAO Lunyang1，2，YUAN Shuangshuang1，2. Simulations of crack propagation in rock-like materials using peridynamic method. , 2016, 35(S2): 3507-3515.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0900 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3507

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