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为了进一步验证数字图像技术分析承台下土体变形场的可行性和揭示土体的三维变形场发展规律,对模型试验中复合桩基承台下土体变形特性进行了数值分析。模拟结果表明:随着桩距增大,基桩的承载力逐步得到充分发挥;3b桩距桩基地表土体变形的影响范围较之6b桩距桩基要大,地表隆起的范围和隆起量亦较之6b桩距要大,但桩侧及桩端土体变形的影响范围较之6b桩距的要小。3b桩距桩基在桩端外侧和承台板边处土体变形以侧向变形为主,而桩端内侧土体变形基本保持垂直向下的运动模式。6b桩距桩基承台下压缩区主要集中在上部土体中,桩端土体有较大的刺入变形。数值模拟结果为宏观上合理确定复合桩基沉降计算模式提供了必要依据。
In order to further verify the feasibility of digital image analysis of soil deformation field under soil and to reveal the law of soil three-dimensional deformation field, the deformation characteristics of soils under composite pile foundation are numerically analyzed. The simulation results show that: with the increase of pile spacing, the bearing capacity of the foundation pile is gradually brought into full play; 3b, the influence scope of the soil deformation of the foundation pile surface is larger than that of the pile foundation with 6b pile spacing, But also larger than the 6b pile spacing, but the side of the pile and the impact of soil deformation than the 6b pile spacing is smaller. The deformation of soil body is mainly lateral deformation at the pile outer side and the bearing plate edge of the pile foundation. The soil deformation inside the pile tip maintains the vertical downward movement pattern. 6b Pile spacing Pile foundation under the compression zone is mainly concentrated in the upper soil, the pile tip soil greater piercing deformation. The numerical simulation results provide the necessary basis for macroscopically judging the settlement model of composite pile foundation.