高渗透压作用脆性岩石宏细观力学本构模型

doi:10.13722/j.cnki.jrme.2019.0789

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摘要高渗透水压作用驱动的脆性岩石内部细观裂纹扩展，对岩石宏观力学特性研究有着重要意义。提出一种考虑渗透水压驱动裂纹扩展作用下的，脆性岩石应力–应变本构关系宏细观力学模型。该模型考虑了渗透水压对岩石初始裂纹面与新生成翼型裂纹面的影响。渗透水压弱化了初始裂纹面法向应力作用，同时强化了新生成翼型裂纹扩展驱动力，这2种裂纹面渗透水压作用构成了渗透水压驱动裂纹扩展机制。其中，在新生成翼型裂纹扩展驱动力的理论分析中，引入一个渗透水压导致的翼型裂纹面张拉力变量Fp，该变量对于渗透水压导致脆性岩石裂纹扩展直至失效起到了关键作用。然后，结合基于宏细观损伤定义建立的裂纹扩展与宏观变形联系，建立渗透水压诱发细观裂纹扩展导致的应力–应变本构关系。研究渗透水压对应力–应变关系曲线的影响，并对比试验结果，验证了理论模型的合理性。分析渗透水压导致的翼型裂纹面张拉力，以及翼型裂纹面张拉力与初始裂纹面张拉力比值(Fp/Fw)，随裂纹扩展变化的规律。讨论渗透水压对裂纹启裂应力与峰值强度的影响。

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	李晓照1
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	戚承志1
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	邵珠山3

关键词 ：岩石力学, 脆性岩石, 渗透水压, 裂纹扩展, 宏细观模型

Abstract：Meso-crack growth caused by the seepage pressure has a great significance for the macroscopic mechanical behaviors in brittle rocks. A meso-macro stress-strain constitutive model considering seepage pressure is proposed. The effects of seepage pressure on initial crack surface and wing crack surface are considered in this model. Seepage pressure weakens the normal stress on initial crack surface，and enhances the crack tension force on wing crack surface，which explains the mechanism of seepage pressure-induced crack growth. A variable of tension force at wing crack surface，i.e.，Fp，caused by seepage pressure is introduced into this proposed model，which has a key function in crack growth to failure of rocks. Combing a suggested relationship between crack growth and strain by relating meso-damage with macro-damage，the stress-strain constitutive relationship caused by microcracks growth under seepage pressure is established. Effects of seepage pressure on the stress-strain curves are studied. Rationality of the proposed model is verified by comparing the experimental data. Variations of the tension force at wing crack surface or the ratio between the tension force at wing crack surface and the tension force at initial crack surface (i.e.，Fp/Fw) with wing crack growth are analyzed. Effects of seepage pressure on crack initiation stress and peak strength are discussed.

Key words： rock mechanics brittle rocks seepage pressure crack extension meso-macro model

引用本文:

李晓照1，2，3，戚承志1，2，邵珠山3. 高渗透压作用脆性岩石宏细观力学本构模型[J]. 岩石力学与工程学报, 2020, 39(S1): 2593-2601.
LI Xiaozhao1，2，3，QI Chengzhi1，2，SHAO Zhushan3. Meso-macro mechanical constitutive model under high seepage pressure in brittle rocks. , 2020, 39(S1): 2593-2601.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0789 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/2593

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