钙质土中重力串锚水平承载力特性有限元研究

Finite Element Study on Horizontal Bear Capacity Characteristics of Multiple Gravity Anchors in Calcium Soil

目前没有规范给出串锚的水平承载力计算公式,为了利用有限元法研究串锚水平承载力特性,采用相关理论计算以及室内试验的方法来验证有限元法模拟计算的可靠性。实践证明,有限元法具有较高的计算精度。利用有限元分析软件ABAQUS建立了串锚-土体模型,模拟串锚在水平荷载作用下破坏过程,研究了串锚在水平荷载作用下破坏机理,从而得到了串锚水平承载力特性。在相同的工况条件下,串锚的水平承载力与其锚链长度有关,在一定范围内,增加锚链的长度可以提高串锚的水平承载力;串锚的水平承载力不是相应的单个锚的水平承载力相加,其水平承载力小于相应的单个锚水平承载力之和,在进行串锚水平承载力设计计算时应给与相应的考虑。

There is no calculation formula of horizontal bearing capacity of multiple gravity anchors in any technical code at present. In order to study the characteristics of the horizontal bearing capacity of multiple gravity anchors by finite element method (FEM), theoretical calculation and laboratory test methods are used to verify the reliability of FEM. Results show that the FEM has higher calculation accuracy. A multiple gravity anchors-soil model is created with finite element software ABAQUS and its failure process under the horizontal loading is simulated. The mechanism of horizontal bearing capacity of gravity anchors is studied at same time. Research results indicate that under the same working condition, the horizontal bear capacity of multiple gravity anchors relates to its length of anchor chain and increases with its length increasing within a certain length. Horizontal bearing capacity of multiple gravity anchors is less than the sum of calculated value of corresponding single anchor’s. The characteristics of horizontal bearing capacity of multiple gravity anchors should be considered when design and calculate its horizontal bearing capacity.