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| Vibration mitigation characteristics of CFG pile-supported transversely isotropic subgrade under high-speed train loading |
| BI Junwei1,2,3，GAO Guangyun1,4，GENG Jianlong1,4 |
1.College of Civil Engineering, Tongji University, Shanghai 200092, China;
2.School of Civil Engineering & Transportation, South China University of Technology, Guangzhou 510641, China;
3.Guangzhou Design Institute Group Co., Ltd., Guangzhou 510620, China;
4.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Shanghai 200092, China |
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Abstract Deducing the 2.5D FEM governing equations for the transversely isotropic ground, and simplifying the CFG pile-supported subgrade by the equivalent pile walls, the 2.5D FEM model for CFG pile-supported transversely isotropic subgrade under high-speed train loading was established. Considering different train speeds, the effects of the stiffness ratio n of transversely isotropic ground on vibrations are analyzed. The vibration reduction mechanism of CFG pile composite subgrade is studied. Meanwhile, the influences of pile diameter, spacing, and area replacement ratio m on the vibration mitigation performance are discussed in detail. Results show that the ground vibrations induced by high-speed trains decrease with the increasing stiffness ratio n. Most of the dynamic load is undertaken by CFG pile composite subgrade, and transmitted along the depth into composite subgrade, which results in evidently reduction of ground vibrations. And the vibration mitigation effect enhances with the increasing diameter or the decreasing spacing. However, when the pile diameter or spacing exceeds one certain limit, further increasing diameter or shortening pile spacing cannot significantly improve the effect of vibration reduction. Additionally, with the increasing area replacement ratio m, the factor of vibration reduction FVR decreases gradually. When the area replacement ratio m is equal or greater than 0.06, further increasing area replacement ratio m has little effect on the vibration mitigation performance.
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Received: 30 August 2021
Published: 28 February 2023
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