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悬臂式抗滑桩桩间距计算及三维数值模拟

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为探究合理的抗滑桩的桩间距,在考虑土拱效应的基础上,提出在合理桩间距下,桩端土拱和桩侧土拱同时发挥功效以抵抗滑坡下推力的假设.根据桩间静力平衡条件以及土体 Mohr-Coulomb 强度准则,推导出桩间距计算式,并通过工程实例对算式进行验算,在保证一定安全度的情况下,证实了算式的合理性,并分析了桩间距计算式内各参数对桩间距的影响;而后通过三维数值模拟的分析,进一步证实了桩间距计算式的合理性.结果表明:在合理桩间距下,桩间距随着土体黏聚力、抗滑桩正面宽度、侧面宽度的增大而线性递增,随着土体内摩擦角的增大而呈二次曲线式递增,随着滑坡均布推力的增大而呈二次曲线式递减.三维数值模拟证实:随着桩间距的增大,土拱效应逐渐减弱,抗滑桩的抗滑效果逐渐降低;随着桩间距增大,桩侧土体的位移愈来愈大,且越靠近土拱中段,位移变化愈大,而桩端处位移则受桩间距影响较小,在远离抗滑桩的区域相较于更近的区域,土体位移变化幅度较小.
Calculations on Pile Spacing of Cantilever Anti-Slide Piles and Its Three-Dimensional Numerical Simulations
To study the reasonable pile spacing of anti-slide piles,based on the soil arching effect,it was proposed a hypothesis that in the reasonable pile spacing,the soil arches at pile ends and pile sides were simultaneously activated to resist the slide forces of landslides.According to the static equilibrium condition between piles and the Mohr-Coulomb strength criterion of soil,a formula for pile spacing was deduced and checked through engineering cases.In the condition of a certain safety margin,the rationality of the formula was verified.Subsequently,the impact of variable parameters of the formula on pile spacing was analyzed.Eventually,the rationality of the formula was further verified by three-dimensional numerical simulations.The results indicated that in the condition of reasonable pile spacing,the spacing linearly increased with the cohesion of soil,front and side widths and increased with internal friction angles of soil as a quadratic func-tion,and simultaneously,it dropped sharply as a quadratic function with the increase in uniform thrust of landslides.The three-dimensional numerical simulations demonstrated the earth arch effect decreased con-stantly with the increase in pile spacing,and the anti-slide effect of anti-slide piles also decreased.With the increase in pile spacing,the displacement of soil beside piles was larger and larger,and the closer to the middle section of earth arches,the greater the displacement was.However,the displacement of soil at pile ends was less influenced by pile spacing and changed slightly away from anti-slide piles compared to that closer to anti-slide piles.

pile spacinganti-slide pileearth arch effectMohr-Coulomb criterionthree-dimensional nu-merical simulation

朱竹亮、林斌

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安徽理工大学土木工程学院,安徽淮南 232001

桩间距 抗滑桩 土拱效应 Mohr-Coulomb强度准则 三维数值模拟

高校博士点专项基金项目安徽省自然科学基金项目

2008036100042008085ME143

2024

工业建筑
中冶建筑研究总院有限公司

工业建筑

CSTPCD
影响因子:0.72
ISSN:1000-8993
年,卷(期):2024.54(10)