考虑渐进性破坏的岩石损伤本构模型研究

发布时间：2018-01-07 02:33

本文关键词：考虑渐进性破坏的岩石损伤本构模型研究　出处：《地下空间与工程学报》2015年06期 　论文类型：期刊论文

【摘要】：根据连续损伤理论和统计强度理论,从岩石材料内部包含大量随机分布的微裂隙等缺陷的特点出发,采用修正的Harris函数作为岩石损伤参量的数学模型,并结合Hoek-Brown准则建立能反映岩石破裂全过程的损伤本构模型。通过引入损伤系数J,较好地反映了岩石的渐进破坏特性,也在一定程度上表征了这种准脆性材料的非均匀性和各向异性。利用多元函数极值理论,并依据试验曲线的特征参量,确定出损伤本构模型参数,最后用试验数据对模型进行了验证。通过比较分析说明了该模型的合理性和可行性,在此基础上,探讨了相关参数对理论曲线与试验曲线吻合程度的影响,从而对实际工程具有一定的参考价值。
[Abstract]:According to the theory of continuous damage and statistical strength, the characteristics of defects such as a large number of randomly distributed microcracks in rock materials are discussed. The modified Harris function is used as the mathematical model of rock damage parameter. The damage constitutive model which can reflect the whole process of rock fracture is established with Hoek-Brown criterion. By introducing the damage coefficient J, the progressive failure characteristics of rock are well reflected. The inhomogeneity and anisotropy of the quasi-brittle material are also characterized to a certain extent. The damage constitutive model parameters are determined by using the multivariate function extremum theory and the characteristic parameters of the test curve. Finally, the model is verified with experimental data. The rationality and feasibility of the model are proved by comparative analysis. On the basis of this, the influence of relevant parameters on the degree of coincidence between theoretical curve and test curve is discussed. So it has certain reference value to the actual project.
【作者单位】：南京理工大学土木工程系;南京大学地球科学与工程学院;
【基金】：国家自然科学基金(40872172) 国防科技重点项目(科工二司[2012]491号) 国家重点基础研究发展(973)计划(2013CB036001)
【分类号】：TU452
【正文快照】： 1引言作为一种集合复杂矿物的典型地质材料,岩石中含有大量随机分布的微缺陷,如微裂纹、微孔隙等初始损伤。近年来的试验研究已表明,岩石的破坏具有渐进特性[1],即当应力超过其抗压强度时,随变形的不断发展,岩石强度逐渐衰减直至残余强度,产生应变软化现象。岩石本构关系问题

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