拉剪应力下单裂隙岩体受温差影响的强度研究

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doi:10.6040/j.issn.1672-3961.0.2024.060

摘要： 为研究温度差对拉剪应力状态下裂隙岩体力学特性的影响规律,从高岩温隧洞、边坡等工程实际中出现的岩体拉剪破坏现象出发,基于能量及线弹性断裂力学理论,推导出单裂隙岩体在温差下裂隙强度的表达式;并使用数值方法将裂隙倾角、水平压力等因素与温度应力相结合,系统研究了拉剪应力条件下裂隙岩石的强度、裂纹扩展演化机制等。结果表明:在拉剪应力状态下,随着温差由5 ℃增大到15 ℃,岩石产生热膨胀,导致裂隙岩体内应力增加。当裂隙倾角从155°接近最大剪切应力180°方向时,主要剪应力更容易作用于裂隙面,使得抵抗剪切的阻力减小,初裂强度降低,从而推动裂隙剪切并发生扩展。本研究揭示了拉剪应力状态下单裂隙岩体在温差条件下受多因素影响的强度特性规律,有助于工程师在设计阶段对岩体的稳定性进行初步评估,从而制定相应的施工方案和预防措施。

关键词: 单裂隙岩体, 温差, 裂隙倾角, 拉剪应力, 初裂强度

中图分类号:

TU452

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ZHANG Yan, LAI Qianlong, REN Xiang. Study on the strength of single fracture rock mass affected by temperature differences under tensile-shear stress[J]. Journal of Shandong University(Engineering Science), 2025, 55(2): 143-155.

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