基于损伤释放能的岩石损伤计算方法

doi:10.13722/j.cnki.jrme.2022.0065

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摘要既有岩石损伤计算方法存在单轴加载和循环加载时能量计算结果不一致的问题。为解决此问题，分析既有能量计算方法和能量转化机制，进一步提出基于损伤释放能的岩石损伤计算方法，最后开展室内试验对其可靠性进行验证。研究表明，耗散能和岩样破坏时释放的弹性能均与岩样的损伤状态相关，可将这两部分能量统称为损伤释放能。其在单轴压缩情况下为加载到破坏时吸收的能量，在循环受压情况下为初始循环、中间循环以及最后加载段损伤释放能的总和。损伤释放能增量在初始循环可通过对加载段和卸载段积分求得，在中间循环为当前循环耗散能和前一循环阻尼能的差，在最后加载段为该循环输入能和前一循环阻尼能的差。室内实验发现，单轴压缩和循环受压情况下同种类型岩样破坏时的总损伤释放能大致相同，能够在仅有单轴加载结果的前提下分析循环加载期间岩样的损伤演化。此外，该方法能够较好地反映岩样损伤随加载进程的演化。

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	雷明锋1
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	赵晨阳1
	曾灿3
	贾朝军1
	徐间锋3
	黄娟1

关键词 ：岩石力学, 损伤释放能, 损伤计算方法, 单轴加载, 循环加载

Abstract：The existing rock damage calculation methods have the problem of inconsistent energy calculation results for the uniaxial loading and cyclic loading. To solve this problem，both the existing calculation methods and the energy conversion mechanism are analyzed，a rock damage calculation method based on damage release energy is further proposed，and the indoor tests were conducted to verified its reliability. The research results indicate that the dissipated energy and the elastic energy released when rock sample fails are related to its damage state. These two kinds of energies can be defined as damage release energy. It is the absorbed energy from the loading to the failure in the case of uniaxial loading. For the case of cyclic loading，it is the sum of that of the initial cycle，the intermediate ones，and the final loading stage. The increment of damage release energy in the initial cycle can be obtained by integrating the loading stage and unloading stage，that in the intermediate cycle is the difference between the dissipated energy of the current cycle and the damping energy of the previous one，and that in the final loading stage is difference between the input energy of the cycle and the damping energy of the previous one. The indoor tests show that the total damage release energies for the same type of rock samples are about the same under uniaxial loading and cyclic loading. The damage evolution of rock sample during cyclic loading can be analyzed on the premise that only the uniaxial loading results are obtained. Besides，this method can better reflect the damage evolution of rock sample with the loading process.

Key words： rock mechanics damage release energy damage calculation method uniaxial loading cyclic loading

引用本文:

雷明锋1，2，赵晨阳1，曾灿3，贾朝军1，徐间锋3，黄娟1. 基于损伤释放能的岩石损伤计算方法[J]. 岩石力学与工程学报, 2022, 41(S2): 3210-3218.
LEI Mingfeng1，2，ZHAO Chenyang1，ZENG Can3，JIA Chaojun1，XU Jianfeng3，HUANG Juan1. Rock damage calculation method based on the damage release energy. , 2022, 41(S2): 3210-3218.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0065 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3210

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