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| Comparative vibrating table test study on optimized seismic performance of h-type anti-sliding pile structures |
| HOU Xiaoqiang1，REN Jixian1，ZHENG Jiale1，WANG Xinfei1，WU Honggang2，JIA Honglu3 |
| (1. School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China；2. China Northwest Research Institute Co.，Ltd.，of CREC，Lanzhou，Gansu 730000，China；3. China Construction Road and Bridge Group Limited，Shijiazhuang，Hebei 050000，China) |
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Abstract To address engineering issues such as the brittle failure at the rigid connection of the crossbeam in h-shaped anti-sliding piles under seismic action，a new type of h-shaped anti-sliding pile structure with inclined crossbeam supports was developed. A series of indoor shaking table model tests were conducted to compare the traditional and optimized h-shaped anti-sliding piles in terms of acceleration，dynamic soil pressure，Fourier spectrum response，and slope deformation characteristics，revealing the improved seismic performance of the optimized structure. The results show that：(1) In terms of slope deformation，as the seismic intensity increases，cracks in the entire slope propagate from the side of the traditional pile to that of the optimized pile. The optimized h-shaped anti-sliding pile demonstrates delayed deformation characteristics compared to the traditional pile，with significantly smaller pile displacement and slope crack deformation dimensions. (2) From the perspective of acceleration response and peak characteristics，the acceleration response in the anchoring section of both pile types is weak，while the response in the loaded section from the sliding surface to the pile top gradually increases，with the optimized pile showing a marked reduction. The acceleration amplification factor of the optimized pile is lower than that of the traditional pile. (3) Analyzing the Fourier spectrum response characteristics and amplitude peaks，the optimized h-shaped anti-sliding pile with inclined crossbeam supports and damping rubber bearings shows a significantly weaker Peak Fourier Spectral Acceleration(PFSA) response amplitude in the f1 low-frequency band compared to the traditional pile. Additionally，in the f2 and f3 mid-frequency to high-frequency bands，the vibration amplitude near the pile top of the loaded section of the optimized pile is notably reduced，enhancing the overall vibration characteristics of the pile. (4) Regarding dynamic soil pressure response and peak values，the dynamic response of the soil for the optimized pile is significantly reduced compared to the traditional pile. Under seismic intensities ranging from 0.3 g to 0.8 g，the peak soil pressure behind the optimized pile decreased by 30.6%–58.4% compared to the traditional pile，and by 40.7%–41.7% in front of the pile，effectively improving the dynamic soil pressure response under seismic action. These findings indicate that the optimized h-shaped anti-sliding pile with inclined crossbeam supports has excellent seismic and damping performance. The results provide new perspectives and technical support for the treatment of large and medium-sized landslides in seismically active regions.
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2024, Vol. 43 
