透风率及积雪形态对防雪栅防护效果的影响  

Influence of Porosity and Snow Form on Protective Effect of Snow Fence

作　　者：刘庆宽[1,2,3] 李海飞 贾娅娅 孙元春 高岭 LIU Qingkuan;LI Haifei;JIA Yaya;SUN Yuanchun;GAO Ling(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University Shijiazhuang,050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province Shijiazhuang,050043,China;School of Civil Engineering,Shijiazhuang Tiedao University Shijiazhuang,050043,China;China Railway Design Corporation Tianjin,300251,China;Hebei Provincial Communications Planning and Design Institute Shijiazhuang,050011,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043 [4]中国铁路设计集团有限公司,天津300251 [5]河北省交通规划设计院,石家庄050011

出　　处：《振动．测试与诊断》2023年第2期390-396,416,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51778381);河北省自然科学基金资助项目(E2018210044,E2021210110);河北省高端人才资助项目(冀办[2019]63号);河北省研究生创新资助项目(CXZZSS2020065);石家庄铁道大学研究生创新资助项目(YC2020016)。

摘　　要：针对道路风吹雪灾害的工程防雪措施,采用数值模拟与现场实测相结合的方法,系统研究防雪栅透风率和不同阶段积雪形态对防雪栅周边流场的影响特性,分析不同阶段积雪的形成机理,得到防雪栅周边积雪的演化规律。结果表明:随着防雪栅透风率的增加,防雪栅背风侧低速区以及旋涡范围逐渐缩小,雪颗粒堆积的速度变慢,对于不同透风率的防雪栅,积雪均最先在其背风侧5 H~9 H范围内发生沉积(H为防雪栅高度),并逐渐向两侧延伸;防雪栅底部间隙使得气流在防雪栅底部被加速,雪颗粒不易沉积,有效延长了防雪栅被积雪掩埋的时间;防雪栅两侧-2.5 H~18 H范围雪颗粒均会发生沉积,随着积雪厚度的不断增加,积雪的增长速率逐渐趋缓。Base on the engineering snow-prevention measures of the drifting snow disaster along railway and highway,the method of combining numerical simulation and field observation is employed to study the influence characteristics of the porosity and snow form at different stages on the flow field around the snow fence,analyze the formation mechanism of snow cover at different stages,and obtain the evolution law of snow cover around the snow fence.The results show that:with the increase of the snow-fence porosity,the low speed zone and vortex range of the leeward side decreases gradually,which cause the snow accumulation velocity becomes slower.Furthermore,the first stacking position of snow is all in the range of 5H~9H on the leeward of the snow fence for different porosities,and gradually extends to both sides of the accumulated snow.The bottom gap of snow-fence makes the air flow accelerate at the bottom of the snow fence and snow particles are not easy to deposit,which effectively prolongs the time that the snow fence is buried.The range of the snow particles position is-2.5H~18H on both sides of the snow fence,and the growth rate of snow slows down gradually with the continuous increase of snow thickness.

关 键 词：防雪栅 风吹雪灾害 现场实测 积雪形态 透风率 

分 类 号：U418.5[交通运输工程—道路与铁道工程] U212.34