碳纤维增强塑料加固抗滑桩的阻断分析

Blocking Analysis of Anti-slide Piles with Carbon Fiber Reinforced Plastics

针对抗滑桩自由段的荷载条件,分析了桩体在土体等效集中荷载、桩侧土体摩擦力和土体自重应力外载作用的内力分布特征,获得到了桩体剪力和弯矩的解析式。依据桩体复合裂纹的分布特征,还得到了拉剪应力条件下桩体结构的KI和KII应力强度因子解析式和裂纹张开位移COD计算式。现场实验和数值分析表明:碳纤维增强塑料(CFRP)对抗滑桩的裂纹扩展、大变形和塑性区分布具有明显的抑制作用,并进一步显示了在滑面位置需同时增强抗滑桩强度的重要性,进而验证了CFRP加固抗滑桩的实用性,拓宽了其应用范围。

According to the load conditions of the free section of anti-slide pile,the distribution characteristics of the internal forces of the pile under the equivalent concentrated load on the soil,the frictional force on the side of the pile and the external load of the self-weight stress of the soil were analyzed,and the analytical expressions of the shear force and bending moment of the pile were obtained.Based on the distribution characteristics of composite cracks in piles,the analytical formulas of stress intensity factors KⅠ and KⅡ and COD of crack opening displacement for pile structures under tension-shear stress were obtained.Field experiments and numerical analysis show that:carbon fiber reinforced plastics(CFRP)can obviously inhibit the crack growth,large deformation and plastic zone distribution of anti-slide piles,and further shows the importance of strengthening the strength of anti-slide piles at the same time at the sliding surface position.It further verifies the practicability of CFRP strengthening anti-slide piles and broadens its application scope.