桩后及桩侧土拱共同作用的抗滑桩桩间距分析  

Analysis of spacing between anti-slide piles considering soil arch on lateral sides and back

作　　者：邱子义 韩同春[1,2] 豆红强[1,2] 李智宁[1,2] 

机构地区：[1]浙江大学滨海与城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2016年第3期559-565,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51178423);浙江省自然科学基金资助项目(LY15E080010)

摘　　要：为得到较为符合工程实际的抗滑桩合理桩间距计算公式,在考虑桩土相互作用及已有数值模拟结果的基础上,提出桩后土拱及桩侧土拱同时存在并共同受力的计算模型,且两者拱轴线线型符合合理拱轴线条件.分析抗滑桩桩后土拱及桩侧土拱极限承载力,并假定在合理桩间距条件下,桩后土拱及桩侧土承载力之和为土体总推力的大小.在此假设的基础上,推导出合理桩间距的计算公式,分析考虑滑坡推力在沿桩深度方向上非均匀分布的工况,并与工程实际进行比较,结果与之相符合.对所得合理桩间距计算公式中参数进行分析,结果表明:合理桩间距随抗滑桩截面尺寸及土体黏聚力增大而线性增加,随土体内摩擦角增加而曲线递增.A calculation model considering soil arching behind the pile and soil arching in the pile side working together was established on the basis of numerical simulations by previous studies as well as the interaction between piles and soil,in order to set up a more practical reasonable anti-slide pile spacing calculation formula.The arch axis of soil arching behind the pile and soil arching in the pile side met requirements for the reasonable arch axis.Both the ultimate bearing capacities of soil arch in the pile side and behind the pile were analyzed.With reasonable pile spacing,the summation of both ultimate bearing capacities was equaled to the total load behind the piles.Under this assumption,the formulation was proposed to calculate the reasonable pile spacing.And one case was analyzed according to the non-uniform distribution of landslide thrust along the depth of piles.The calculating results fitted well with engineering practice.At last,some parameters in the formation were analyzed.Results show that the reasonable pile spacing increases linearly with the increase of the section size and cohesion,and increases along the curve with the increase of internal friction angle.

关 键 词：滑坡治理 抗滑桩 土拱效应 合理桩间距 

分 类 号：TU473[建筑科学—结构工程]