Hysteretic curve features and damage quantitative evaluation of granite residual soil under impact load
LIU Xinyu1, 2, ZHANG Xianwei1, KONG Lingwei1, ZHANG Shixing3, XU Chao4
1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
4.Xiamen Rail Transit Group Co., Ltd., Xiamen 361000, China
Abstract:In order to evaluate damage development law of granite residual soil under impact load, laboratory cyclic impact tests based on different amplitudes, frequencies and confining pressures were conducted to obtain morphological features of hysteretic curves. 4 quantitative structure damage parameters including accumulative dissipated energy EN, cumulative damage degree dN, stiffness degradation degree δN and residual plastic strain εN were proposed to reflect specimens’ energy dissipation, damage degree, stiffness degradation and development characteristics of plastic strain under impact load. The quantitative evaluation of impact damage was realized by means of evolution laws and relations of parameters, and damage and failure mechanisms of specimens were proposed. The results showed that EN increases rapidly under impact load with high amplitude (A=400 kPa), low frequency or ultra-high one (f=3 or 15 Hz), specimens’ dN is larger; under the same frequency and confining pressure, dN of high amplitude specimen is 9.5 times of that of low amplitude one (A=200 kPa), and dN of high frequency and ultra-high frequency specimen is 24% higher than that of medium frequency one (f=10 Hz); the higher the damage degree, the more serious the specimen stiffness attenuation; δN of failure specimen is generally more than 0.65, this further leads to the rapid development of specimen εN, and finally leads to failure; under high confining pressure (σ′3=500 kPa), energy dissipation is slow and dN is smaller, δN is only 13% of that of low confining pressure (σ′3=50 kPa), so the ability to resist impact deformation is also enhanced. According to test results, it was pointed out that deformation and failure of specimen under impact load is essentially damage of soil structure caused by dissipation of impact energy, the caused stiffness attenuation generates the comprehensive embodiment of macro plastic deformation accumulation; high amplitude, low frequency and ultra-high frequency impact load should be avoided as far as possible in the project; if necessary, compaction and reinforcement of soil can be used to effectively prevent damage of impact load; the study is helpful to deepen the understanding of impact failure mechanism and provide a technical guidance for the construction and design of granite residual soil layer in China.
刘新宇1,2,张先伟1,孔令伟1,张世兴3,徐超4. 冲击荷载下花岗岩残积土的滞回曲线特征与损伤定量评价[J]. 振动与冲击, 2021, 40(1): 58-67.
LIU Xinyu1, 2, ZHANG Xianwei1, KONG Lingwei1, ZHANG Shixing3, XU Chao4. Hysteretic curve features and damage quantitative evaluation of granite residual soil under impact load. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(1): 58-67.
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