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以港珠澳大桥海底沉管隧道基础沉降控制研究为科研背景,为研究岛头高边载作用下隔离桩受力特性及其隔离效果,进行了4组室内模型试验。试验结果表明:隔离桩在边载作用下呈典型的被动桩受力特性,且隔离桩桩身最大弯矩随着长度的增加而增加;因隔离桩的隔离作用,每级边载作用下邻近桩基的桩身最大轴力较无隔离桩情况下减小10.5%左右,同时,桩身最大正弯矩和最大负弯矩分别减小20%和25%左右;邻近桩基桩身最大轴力减小幅度随着隔离桩长度的增加而减小,但桩身最大正弯矩减小幅度随着隔离桩长度的增加而增加,弯矩隔离效果较为显著。
Taking the research on subsidence control of submerged immersed tunnel in Hong Kong-Zhuhai-Macao Bridge as a research background, four groups of indoor model tests were carried out to study the mechanical properties of the isolated pile and its isolation effect under the high side loading of the island head. The test results show that the isolation piles have the characteristics of typical passive pile under the side loading and the maximum bending moment of the piles increases with the increase of the length. Due to the isolation of the piles, The maximum axial force of the pile body is reduced by about 10.5% compared with the case without the isolation pile, meanwhile the maximum positive bending moment and the maximum negative bending moment of the pile body are respectively reduced by 20% and 25% The decrease of force decreases with the length of isolation piles, but the decrease of the maximum positive moment of pile increases with the length of isolation piles, and the effect of moment isolation is more obvious.