土洞影响下桥梁桩基承载特性及参数敏感性研究  

Study on Bearing Behavior and Parameter Sensitivity of Bridge Pile Foundation under the Influence of Soil Cave

作　　者：李强 郑志明 董磊 庄培芝[3] LI Qiang;ZHENG Zhiming;DONG Lei;ZHUANG Peizhi(China Highway Engineering Consulting Corporation,Beijing 100097,China;Gaode Highway Construction(Dezhou)Co.,Ltd.,Dezhou 253521,Shandong,China;Shandong University,Jinan 250100,China)

机构地区：[1]中国公路工程咨询集团有限公司,北京100097 [2]高德公路建设(德州)有限公司,山东德州253521 [3]山东大学,济南250100

出　　处：《路基工程》2025年第2期148-155,共8页Subgrade Engineering

基　　金：山东省青年基金项目(ZR2021QE186)。

摘　　要：依托济青高速公路潍坊至青岛段及连接线工程潍河特大桥ZK45桩开展现场试验,建立桩基-土洞-岩土体模型,分析桩基承载特性对土洞各参数的敏感性。结果表明:土洞高度与桩长比(高长比)和土洞跨度增加使桩基承载力降低,降低速度分别逐渐增大与逐渐减小,桩长比和洞跨分别增加0.16、6 m,承载力分别降低14.95%和6.75%;土洞埋深逐渐增加至8 m使桩基承载力降低,承载力减小8.30%;土洞范围内桩基轴力不变且桩侧阻力几乎不发挥,洞高增加使桩侧阻力不发挥的范围扩大;桩侧阻力占比随洞高、埋深增加呈现先增大后减小趋势,随洞跨增加呈现先减小后增大趋势;桩基承载特性对土洞高度、跨度和埋深的敏感度排序为:土洞高度>土洞埋深>土洞跨度。In the section from Weifang to Qingdao of Jinan—Qingdao Highway and at the Pile ZK45 of Weihe Grand Bridge on the connecting line,the field tests were carried out and,with the model of pile foundation-soil cave-rock soil mass established,the sensitivity of the pile foundation's bearing behavior to the parameters of the soil cave was analyzed.The result shows that,as the ratio of soil cave height to pile length(height length ratio)and the soil cave span increase,the bearing behavior of pile foundation decreases with the deceleration gradually increases or decreases,respectively and,when the height length ratio and the cave span increase by 0.16 m and 6 m respectively,the bearing capacity respectively decreases by 14.95%and 6.75%;as the buried depth of soil cave gradually increases to 8 m,the bearing capacity of pile foundation decreases by 8.30%;in the scope of the soil cave,the axial force of pile does not change and the pile side resistance almost does not come into play,moreover,with the increase of the cave height,the scope where the pile side resistance does not comes into play will expand;the rate of side resistance increases first and then decreases with the increase of the cave height and buried depth,or decreases first and then increases with the increase of the cave span;the order of the sensitivity of pile foundation's bearing behavior to soil cave height,cave span and buried depth is as follow:soil cave height>soil cave buried depth>soil cave span.

关 键 词：桥梁工程 桩基 土洞 承载特性 数值仿真 敏感性 

分 类 号：TU473.1[建筑科学—结构工程]