h型抗滑桩结构优化抗震性能对比振动台试验研究

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摘要考虑地震作用下h型抗滑桩横梁刚性连接处易发生脆性破坏等工程问题，基于此研发一种新型h型斜横梁支座式抗滑桩结构。通过开展室内振动台模型对比试验，分析传统和优化2种h型抗滑桩加速度、动土压力、傅里叶频谱响应及坡体变形等方面特征，进一步揭示优化后h型抗滑桩较好的抗震性能。研究结果表明：(1) 从边坡变形角度分析，随地震强度增加，整个边坡变形裂缝由传统桩侧向优化桩侧呈蔓延发展趋势，其中优化h型抗滑桩坡体变形特征相对于传统桩具有滞后性，且其桩身位移、坡体裂缝变形几何尺度明显小于传统抗滑桩；(2) 从抗滑桩加速度响应及峰值特点分析，2种桩锚固段加速度响应较弱，滑面至桩顶受荷段响应逐渐增大，其中优化桩明显减弱，且加速度放大系数均小于传统桩；(3) 从傅里叶频谱响应特征及振幅峰值分析，优化后h型斜横梁支座式抗滑桩设置了减震橡胶支座，在f1低频段优化桩的PFSA响应幅值明显弱于传统桩，同时在f2，f3中高频段，优化桩前桩受荷段靠近桩顶振动幅值减小明显，有利改善了桩身整体振动特性；(4) 从动土压力响应和峰值分析，优化桩比传统桩土动力响应明显减弱，其中在0.3 g～0.8 g强度地震工况下，优化后h型抗滑桩后桩土压力峰值较传统桩降低了30.6%～58.4%，前桩降低了40.7%～41.7%，使得地震作用下动土压力响应得到明显改善。上述结论充分表明优化后h型斜横梁支座式抗滑桩具有良好的抗震减震性能，研究成果可为地震多发地区大中型滑坡治理工程提供新的思路和技术支撑。

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	侯小强1
	任继贤1
	郑佳乐1
	王新飞1
	吴红刚2
	贾洪璐3

关键词 ：边坡工程, 滑坡, h型抗滑桩, 动土压力, 加速度, 振动台试验

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.

引用本文:

侯小强1，任继贤1，郑佳乐1，王新飞1，吴红刚2，贾洪璐3. h型抗滑桩结构优化抗震性能对比振动台试验研究[J]. 岩石力学与工程学报, 2024, 43(12): 2892-2907.
HOU Xiaoqiang1，REN Jixian1，ZHENG Jiale1，WANG Xinfei1，WU Honggang2，JIA Honglu3. Comparative vibrating table test study on optimized seismic performance of h-type anti-sliding pile structures. , 2024, 43(12): 2892-2907.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I12/2892

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