加筋体对变电站桩网复合地基破坏机制的影响分析  

Analysis of the Influence of Reinforcement on the Failure Mechanism of Pile and Grid Composite Foundation in Substation

作　　者：张冰淇 王富 Zhang Bingqi;Wang Fu(Zhejiang Electric Power Transmission and Transformation Engineering Co.Ltd.,Hangzhou,Zhejiang 310016)

机构地区：[1]浙江省送变电工程有限公司,浙江杭州310016

出　　处：《江西建材》2024年第9期244-247,共4页

摘　　要：针对目前桩网复合地基研究较少分析加筋体作用机理的不足,文中采用Plaxis 2D研究加筋体对不同位置桩体破坏顺序、破坏时的极限荷载以及桩体受力特性的影响,在此基础上对加筋与不加筋情况进行比较,探究了加筋体抑制桩体破坏的作用机理。结果表明,无加筋复合地基更易发生弯曲破坏,破坏始于坡脚并逐渐向路基中心延伸;而桩网复合地基则先在坡脚处发生弯曲破坏,随后在中心发生剪切破坏;随着加筋体刚度的增加,桩身弯矩减小,轴力增大,桩体更易发生剪切破坏;加筋体能有效抑制桩体破坏时应力释放对临近桩体内力的影响;相比于早期阶段,加筋体对桩体破坏的抑制作用在后期阶段更为明显。To address the shortcomings of the current research on the progressive failure of pile-reinforced earth composite foundation, the mechanism of reinforcement action is not analyzed. The strain softening model(Concrete Model) of the failure characteristics of unreinforced cement material is used to study the failure sequence of the pile at different locations, the ultimate load at the time of failure and the force characteristics of the pile, and on this basis, the mechanism of pile failure inhibition by reinforcement is investigated by comparing the reinforced and unreinforced cases. The results show that the slope supported by unreinforced composite foundation is more prone to bending failure, and the failure starts at the slope foot and gradually extends to the center of the slope. On the other hand, the flexural failure occurs at the foot of the pile and mesh composite foundation, and then the shear failure occurs at the center of the slope. The stiffness of reinforcement has a significant effect on the ultimate load of each pile.As the stiffness of reinforcement increases, the pile bending moment decreases, making it bear greater axial force and more prone to shear damage;the reinforcement will inhibit the change of internal force of the adjacent pile caused by stress release during pile failure;compared with the early stage, the inhibition effect of reinforcement on pile bending failure in the later stage is more obvious.

关 键 词：桩网复合地基 渐进破坏 水泥土搅拌桩 加筋体 稳定性 

分 类 号：TU47[建筑科学—结构工程]