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Surface Settlement Damage Model of Pile-Anchor Supporting Structure in Deep Excavation

机译：深挖桩锚式支护结构的表面沉降损伤模型

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摘要

In damage mechanics, the deep excavation of soil is a process of damage development, and soil failure can be considered a process of continuously transforming undisturbed soil to damaged soil. Therefore, this study considered the occurrence of soil damage during the pit excavation, established a soil damage model, damage evolution equation, and soil damage constitutive relationship, and then deduced a calculate model of the pile displacement under the consideration of soil damage. Based on the principle of the stratum loss method, the surface settlement around a deep excavated pit was assumed as a skewed distribution curve, and the surface settlement of the pile-anchor supporting pit was solved. Based on this established method, finite element analysis software was used to calculate the surface subsidence for a field case, and the numerical results were compared with monitoring data in the field. The results revealed that, to a certain extent, soil damage affected the distribution of surface settlement in excavated pits. With the development of soil damage, the mechanical properties of soil gradually decreased, which led to increased surface settlement and changes in the direction of the excavation pit. Because soil damage is an important factor causing surface settlement, it is meaningful to consider soil damage when calculating the surface settlement in the deep excavation of pits.
机译：在损坏力学中，土壤的深度挖掘是一种损伤的过程，土壤衰竭可以被认为是将不受干扰的土壤持续转化为受损土壤的过程。因此，这项研究认为在坑开挖期间的土壤损伤发生，建立了土壤损伤模型，损伤演化方程和土壤损害本构关系，然后推导出在土壤损伤的考虑下桩位移的计算模型。基于地层损耗方法的原理，假设深挖坑周围的表面沉降作为偏斜的分布曲线，并解决了桩锚式支撑坑的表面沉降。基于该建立的方法，使用有限元分析软件来计算现场情况的表面沉降，并将数值结果与该字段中的监测数据进行比较。结果表明，在一定程度上，土壤损伤影响了挖掘坑表面沉降的分布。随着土壤损伤的发展，土壤的机械性能逐渐降低，这导致了表面沉降和挖掘坑方向的变化。由于土壤损坏是引起表面沉降的重要因素，因此在计算坑深挖表面沉降时，可以考虑土壤损坏是有意义的。

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