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刘杰, 冯世国, 李天斌, 王瑞红, 雷岚, 王飞. 冲击荷载作用下岩石动态响应预测研究[J]. 岩土工程学报, 2018, 40(11): 2022-2030. DOI: 10.11779/CJGE201811008
引用本文: 刘杰, 冯世国, 李天斌, 王瑞红, 雷岚, 王飞. 冲击荷载作用下岩石动态响应预测研究[J]. 岩土工程学报, 2018, 40(11): 2022-2030. DOI: 10.11779/CJGE201811008
LIU Jie, FENG Shi-guo, LI Tian-bin, WANG Rui-hong, LEI Lan, WANG Fei. Prediction of dynamic response of rock under impact loads[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(11): 2022-2030. DOI: 10.11779/CJGE201811008
Citation: LIU Jie, FENG Shi-guo, LI Tian-bin, WANG Rui-hong, LEI Lan, WANG Fei. Prediction of dynamic response of rock under impact loads[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(11): 2022-2030. DOI: 10.11779/CJGE201811008

冲击荷载作用下岩石动态响应预测研究

Prediction of dynamic response of rock under impact loads

  • 摘要: 利用已有大理岩对冲击波的动态响应图,验证在0.1 Hz不同加载方式下提出的岩石非线性动态响应预测模型及预测公式的适用性和合理性,提出加载速率波形曲线函数的适用条件。经研究表观弹性模量的拟合系数,提出了冲击压实系数a和冲击初始弹性模量b,以及岩样内部裂隙孔洞的压密效应系数a1和滑移错动效应系数a2,且有a=a1+a2,a1>0,a2<0。指出当岩样受到荷载作用时,岩样的压密作用与滑移错动作用是同时存在的,在加载段,|a1|<|a2|,在卸载段,|a1|>|a2|,致使加载段a<0,卸载段a>0。定义了加卸载速率响应比β,表征卸载段平均切线模量与加载段平均切线模量的比值,β值越大岩石的破坏程度越大,不同频率下,砂岩在三角波和正弦波加载方式下均有β≈2。各应变片的应变、变形速率、能量值的实测值与计算值均吻合较好,证明了在低速荷载下提出的岩石非线性动态响应预测模型及预测公式在高速冲击波随时间的毫秒级变化规律情况下具有较好的适用性和合理性,拓宽了该预测公式和模型的应用范围,对位移控制严格的工程设计和施工有现实意义。

     

    Abstract: The existing dynamic response diagram of marble to shock waves is used to verify the applicability and rationality of prediction model and prediction formula for the nonlinear dynamic response of rock under low velocity loading. The applicable conditions of the loading rate waveform function are proposed. Based on the study of the apparent elastic modulus of the fitting coefficient,the impact compaction coefficient a and the impact initial elastic modulus b,as well as the compaction action a1 and slip action a2 of the fractured voids in a rock sample, are proposed, and a=a1+a2,a1>0,a2<0. When it is subjected to the action of loads, the compaction degree of the rock sample and slip action exist simultaneously. In the loading section,|a1|<|a2|,and in the unloading section, |a1|>|a2|. That causes a<0 in the loading stage and a>0 at the unloading section. The loading-unloading rate response ratio β,which represents the ratio of the average tangent modulus of the unloading section to the average tangent modulus of the loading section, is defined. As the value of β increases, the degree of rock damage is also greater. At different frequencies, the sandstone has β≈2 in the loading mode of triangular waves and sine waves. The measured values of strain, deformation rate and energy value of each strain gauge are in good agreement with the calculated ones. It is proved that the nonlinear dynamic response prediction model and prediction formula for rock under low velocity loads have good applicability and rationality in the case of high-speed shock waves with millisecond time variation, which broadens the application range of the prediction formula and model. It is helpful to the design and construction of the project with strict displacement control.

     

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