1.China Academy of Railway Sciences Corporation Limited, Beijing 100081,China;
2.Shenzhen Research and Design Institute, China Academy of Railway Sciences Corporation Limited, Shenzhen 518000,China;
3.Shenzhen Construction Engineering Quality Testing Center, Shenzhen 518052,China
Abstract:In order to study the energy state distribution inside a subgrade under vibration load, based on the Parseval theorem, the calculation formula for the energy dissipation rate of the vibration signals in periodic and non-periodic subgrades was derived by using the dynamic strain/acceleration as variables.According to the principle of dynamic reciprocity of soil, the field test for subgrade dynamic responses under vibration load was carried out.The spatial distribution of energy dissipation rate in the subgrade was analyzed and studied by using the test results.The results show that ①the energy dissipation rate decreases exponentially in both the depth direction and the horizontal direction.The attenuation of energy dissipation rate in the depth direction is more significant than that in the horizontal direction.The attenuation coefficient in the depth direction is 2.5 to 3.0 times of the attenuation coefficient in the horizontal direction.②The attenuation of the energy dissipation rate in the horizontal direction at different depth is basically consistent, and the attenuation in the depth direction at different horizontal position is different.The farther away from the vibration point, the slower the attenuation of energy dissipation rate along the depth direction.③Under the experimental conditions in the paper, the energy distribution range of the vibration subgrade is 1.5 m in the horizontal direction and 0.45 m in the depth direction, the horizontal distribution range of the energy is about 3.3 times greater than the depth range, and the energy distribution area presents a spatial flat “gull” shape.
江辉煌1,2,吴龙梁1,2,高明显2,范少峰3,马驰2. 振动荷载下路基的能量耗散率空间分布规律的研究[J]. 振动与冲击, 2021, 40(2): 185-192.
JIANG Huihuang1,3,WU Longliang1,3,GAO Mingxian3,FAN Shaofeng2,MA Chi3. Spatial distribution of the energy dissipation rate in a subgrade under vibration load. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(2): 185-192.
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