塑性混凝土咬合桩防渗墙变形机理研究

Study on Deformation Mechanism of Plastic Concrete Occlusive Pile Seepage-Preventing Wall

以大连湾沉管隧道南岸港池临时围堰工程监测数据为基础,建立了塑性混凝土咬合桩防渗墙数值计算模型,通过实测数据验证了模型的准确性,分析了不同影响因素下咬合桩防渗墙的变形演化规律,结论表明:水压力相比土压力对咬合桩变形和内力的影响更为显著,水压力增大导致桩身变形和弯矩增大,扰动临时围堰土体;土体坡度的影响较小,但土体坡度应逐渐放缓,不小于1∶1.5;桩长的变化对变形影响较大,较短的桩身未嵌固在岩石中,较长的桩身在桩顶出现最大位移;随着桩径增大,桩顶变形和最大弯矩逐渐增大,弯矩分布较为一致。

Based on the monitoring data of the temporary cofferdam project on the south bank of the Dalian Bay immersed tube tunnel,a numerical calculation model for the plastic concrete interlocking pile anti-seepage wall was established.The accuracy of the model was verified through measured data,and the deformation evolution law of the interlocking pile anti-seepage wall under different influencing factors was analyzed.The conclusion shows that the water pressure has a more significant impact on the deformation and internal force of the interlocking pile compared to soil pressure.The increase in the water pressure leads to the deformation and bending moment of the pile body,which disturbs the soil of the temporary cofferdam;The influence of the soil slope is relatively small,but the soil slope should gradua-lly decrease and not be less than 1∶1.5.The change in pile length has a significant impact on the deformation,with shorter piles that not embedded in the rock and longer piles experiencing maximum displacement at the top of the pile.As the pile diameter increases,the deformation of the pile top and the maximum bending moment gradually increase,and the distribution of bending moments is relatively consistent.