桩锚支护越冬基坑抗冻胀性能分析  

NUMERICAL ANALYSIS OF INFLUENCE OF SOIL QUALITY ON SETTLEMENT OF EXISTING ROAD UNDER SHIELD TUNNELS

作　　者：孙超[1,2] 温歆硕 赵一恺 郭浩天[1,2] SUN Chao;WEN Xinshuo;ZHAO Yikai;CUO Haotian(School of Geometrics and Prospecting Engineering,Jilin Jianzhu University,Changchun 130118,China;IInstitute of Geotechnical Engineering in the Seasonal Frozen region,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,长春130118 [2]吉林建筑大学季冻区岩土工程研究所,长春130118

出　　处：《低温建筑技术》2024年第6期52-56,共5页Low Temperature Architecture Technology

基　　金：吉林省科技发展计划项目(YDZJ202201ZYTS490)。

摘　　要：为解决桩锚支护基坑的越冬问题,对该类基坑负温状态下的抗冻胀性能进行研究。可为实际工程中越冬基坑的桩锚支护设计提供参考依据。考虑锚杆的预应力、层数、间距及锚固长度等因素,运用FLCA^(3D)软件在负温状态下对桩锚支护基坑进行数值模拟研究,分析桩侧冻胀力及桩体位移的变化规律。结果表明锚杆预应力对基坑桩体水平位移影响非常显著,随基坑深度增加,桩侧冻胀力呈增-减-增趋势;随锚杆层数增加,桩体水平位移逐渐减小,而桩侧冻胀力逐渐增大;锚杆竖向间距对桩体的水平位移及桩侧冻胀力的影响较小,桩体水平位移越小,桩侧冻胀力越大;桩体水平位移及桩侧冻胀力随锚固长度增加而增大。研究结果可为桩锚支护越冬基坑的设计和应用提供指导和参考。This paper tries to provide reference for the design of pile-anchor support for wintering foundation pit in practical engineering.In order to solve the wintering problem of pile-anchor support foundation pit,the anti-frost heave performance of this kind of foundation pit under negative temperature condition is studied.Considering the prestress,number of layers,spacing,and anchoring length of anchor bolt,the numerical simulation of pile and an-chor supporting foundation pit under negative temperature is carried out by using FLCA3D software,and the change law of pile side frost heave force and pile displacement is analyzed.The results show that the prestress of anchor rod has a significant effect on the horizontal displacement of pile,and the frost heave force of pile side increases,then de-creases,and then increases with the increase of the depth of foundation pit.The horizontal displacement of pile de-creases gradually with the increase of the number of bolt layers,while the frost heaving force of pile side increases gradually.The vertical distance of bolt has little effect on the horizontal displacement of pile and the freeze-heave force of pile side.The smaller the horizontal displacement of pile,the greater the freeze-heave force of pile side.The horizontal displacement of pile body and the frost heave force of pile side increase with the increase of anchorage length.The research results may provide guidance and reference for the design and application of pile-anchor sup-port over winter foundation pit.

关 键 词：越冬基坑 桩侧冻胀力 桩锚支护 桩体位移 

分 类 号：TU473.1[建筑科学—结构工程]