水利护岸结构施工对临近地下已有原水管线的影响

Influences of the water conservancy revetment structure construction to the adjacent underground raw water pipeline

结合大芦线航道整治二期工程,研究分析了水利护岸结构施工对临近地下已有原水管线的影响.分析结果表明,除了桩基的挤土效应外,施工还会对结构沉降、土体振动、预钻孔塌孔、上部荷载变化等产生影响.考虑采用相应的工程措施来减轻影响,包括原位监测、控制沉桩速率、桩基跳打、限制日打桩数量、预钻孔打桩、考虑前排桩基遮帘作用施工、预钻孔护壁等.工程实践证明,当采用以上措施后,对已有原水管线的影响减弱,效果良好.相关措施可供类似工程参考.

Combined with the 2nd Da Lu waterway regulation project, water conservancy revetment constructions on the existing adjacent underground water supply pipelines were investigated. Besides the squeezing soil effect of the piles, the project also influenced the settlement of the structure and soil vibration, pre-drilling hole collapse, change of upper load, and so forth. To reduce the influence, some measures were taken, including in situ monitoring, control of sink rate of pile, and seperate pilling of neighboring pile foundations, restrictions on piling quantity, pre-drilled piling, considering the front pile curtain effect, and pre-borehole wall protection. The practice results showed that these measures were effective and could be used for the similar projects.