桩基施工对验潮井变形与内力影响数值分析

Numerical Analysis of Influence of Pile Foundation Construction on Deformation and Internal Force of Tidal Borehole

桩基施工过程中对土体的挤压与扰动势必对周围土层的位移与内力产生影响,而其影响范围是判断周围已有建构筑物稳定性的重要依据。采用目前在岩土工程领域广泛使用的三维数值模拟软件FLAC 3D进行模拟计算,得出桩基施工过程中联合国海洋平面观测站(验潮井)变形与内力变化。计算结果显示:1~16号桩在施工过程中对验潮井竖向与侧向均产生了位移,但位移值较小;最小主应力与最大主应力变化不明显。通过对验潮井的位移与内力的计算,南防波堤平台桩基工程施工应由近及远依次施工,施工时应尽量避免对岩土体的扰动与破坏,不得采用爆破施工,保证基岩完整性。

In the process of pile foundation construction,the compression and disturbance of soil mass are bound to affect the displacement and internal force of the surrounding soil layer,and its influence range is an important basis for judging the stability of existing structures around.FLAC 3D,a 3D numerical simulation software which is widely used in geotechnical engineering,is used to calculate the deformation and internal force changes of the United Nations Ocean Surface Observation station(tidal borehole)during the pile foundation construction.According to the calculation results,the vertical and lateral displacement of No.1~16 piles in the construction process of the tidal borehole is generated,but the displacement value is small.The change of minimum principal stress and maximum principal stress is not obvious.Based on the calculation of displacement and internal force of tidal borehole,the pile foundation construction of south breakwater platform should be carried out from near to far,and the disturbance and damage to rock and soil should be avoided as far as possible.Blasting construction should not be used to ensure the integrity of bedrock.