摘要
室内边坡振动台模型试验都是缩尺模型试验,如何配制出能够反映岩石静动力学特性的相似材料,这关系到模型试验结果能否正确地反推到原型。通过对相似材料在振动台试验应变率范围内的力学特性及破坏模式开展了研究,结果表明:在本研究确定的振动台模型试验应变率范围内,岩石相似材料的弹性模量及起裂应力随着应变率的升高基本不会变化,其单轴抗压强度、峰值应变以及微裂纹数量整体呈现三级阶梯状变化;相比于真实岩石,相似材料对应变率的敏感程度更高;在应变率大于0.5s^(−1)的情况下,相似材料的破坏模式发生改变,且破坏程度大幅增加,这会导致模型试验结果夸大原型边坡岩体在进入非线性变形阶段后的破坏程度。因此,应尽可能保证推算至模型的应变率不超过0.5s^(−1)。
The vibration table model test of indoor slope is a reduced scale model test.The preparation of similar materials that can reflect the static and dynamic characteristics of rocks is related to whether the model test results can be correctly reversed to the prototype.This paper focused on the mechanical properties and failure modes of similar materials in the range of strain rates in vibration table tests.The results show that:Within the range of strain rates determined by the vibration table model test in this paper,the elastic modulus and crack initiation stress of similar materials of rocks basically do not change with the increase in strain rates,and the uniaxial compressive strength,peak strain,and the number of micro-cracks show three-step changes as a whole.Compared with real rocks,similar materials are more sensitive to strain rates.When the strain rate is greater than 0.5 s^(−1),the failure mode of similar materials changes,and the failure degree increases significantly,which will lead to the exaggerated failure degree of the prototype slope rock mass after entering the nonlinear deformation stage.Therefore,the calculated strain rate of the model should be controlled within 0.5 s^(−1).
作者
刘汉香
赵晓玉
王铭萱
徐鹏
LIU Hanxiang;ZHAO Xiaoyu;WANG Mingxuan;XU Peng(College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;AVIC Institute of Geotechnical Engineering Co.,Ltd.,Beijing 100000,China)
出处
《华南地震》
2025年第2期125-136,共12页
South China Journal of Seismology
基金
国家重点研发计划(2022YFC3003205)。
关键词
岩质边坡
振动台模型试验
数值模拟
岩石相似材料
应变率效应
Rock slope
Vibration table model test
Numerical simulation
Similar material of rock
Strain rate effect
