软土地区高强螺旋锚基础受力性能研究

Research on mechanical performance of high-strength helicalanchor foundation in soft soil area

使用高强螺旋锚可充分发挥高强钢强度优势,提高单个螺旋锚基础的承载能力。为研究高强螺旋锚基础在上拔工况及施工工况下的受力性能,本文对普通螺旋锚工况及锚盘直径增大、基础埋置深度增大、锚盘个数增加的高强螺旋锚工况进行设计承载能力计算。随后建立各分析工况的土体-结构精细化有限元模型,分别进行上拔工况及施工工况的数值模拟,并将有限元数值模拟结果与理论计算结果进行对比分析。研究结果表明:上拔工况时,锚盘直径增加,螺旋锚承载能力提高,应力提升较大,需使用高强钢保证螺旋锚安全性;基础埋深增加,螺旋锚承载能力明显提高,应力提高适中,为高强螺旋锚较好提高承载力方式;锚盘个数增加,螺旋锚承载能力提升较少,应力提升较小。

The high-strength helical anchor can give full play to the advantages of the strength of high-strength steel,and thus enhance the bearing capacity of a single helical anchor.In order to study the bearing capacity of high-strength helical anchor foundation under pulling condition and construction condition,the designed bearing capacities are calculated in terms of the ordinary anchor condition and high-strength anchor condition in which the anchor plate diameter,foundation embedment depth and the number of anchor plate are increased.Then,the soil-structure refined models of all conditions are established,and the results of finite element numerical simulation are compared with the calculated values.The results show that under the pulling condition,the diameter of the anchor plate increases,the bearing capacity of the bolt and anchor increases,and the stress increases greatly,thus it is necessary to use high-strength steel to ensure the safety of the helical anchor.With the increase of foundation embedment depth,the bearing capacity increases obviously,and the stress increases moderately,which is a better way to improve the bearing capacity of high-strength helical anchor.With the increase of the number of anchor discs,the load-bearing capacity and stress of the helical anchor are less improved.