摘要
研究目的:弹性支承块式无砟轨道是重载铁路长大隧道内较为适宜的轨道结构形式。夺文以中南部通道隧道内弹性支承块式无砟轨道为研究对象,通过开展足尺模型静载试验,研究单个支承块在道床板板端竖向荷载(工况一)、板端横竖向荷载(工况二)、板中竖向荷载(工况三)作用下的受力性能及轨道结构裂缝发展趋势。研究结论:(1)以30 t轴重列车静荷载作为参考,工况一道床板和支承块混凝土分别在3. 3、3. 1倍静轮载时达到轴心抗拉强度,工况二道床板和支承块混凝土分别在3. 0、3. 1倍静轮载时达到轴心抗拉强度,工况三道床板和支承块混凝土分别在4.9、2. 9倍静轮载时达到轴心抗拉强度;(2)工况一道床板裂缝出现于支承块角点位置及支承块长侧边中线位置,并扩展至道床板短侧面,角点处裂缝延伸扩展呈"八"字型,工况三道床板未见明显开裂;(3)列车横向荷载导致支承块角点位置道床板混凝土受力增加;(4)本研究成果对于弹性支承块式无砟轨道的设计、施工及维护具有重要的指导意义。
Research purposes:Low vibration track is a suitable track structure in the heavy haul railway long tunnel. Taking the low vibration track in the middle-south channel tunnel as the research object,through the full-scale model static load test,this paper studies the mechanical properties of a single bearing block under the vertical load at the end of the track bed slab (working condition 1),the horizontal and vertical load at the end of the track bed slab (working condition 2),the vertical load at the middle of the track bed slab (working condition 3)and track's crack development trend. Research conclusions:(1)Taking the static load of 30t axle load train as a reference,the track slab and bearing block concrete of working condition 1 reach the axial tensile strength at 3.3 and 3.1 times static wheel load,the track slab and bearing block concrete of working condition 2 reach the axial tensile strength at 3.0 and 3.1 times static wheel load,the track slab and bearing block concrete of working condition 3 reach the axial tensile strength at 4.9 and 2.9 times static wheel load.(2)Track slab's crack of working condition 1 appears at the corner of the bearing block and the midline of the long side of the bearing block and extends to the short side of the track slab.The crack extension at the comer point is in the shape of "eight".There is no obvious crack of working condition 3 in the track slab.(3)The horizontal load of the train leads to the increase of the force of the concrete in the comer of the bearing block.(4)The research results have guiding significance for the design,construction and maintenance of low vibration track.
作者
吴斌
李世业
曾志平
王卫东
王俊东
吴志鹏
WU Bin;LI Shi-ye;ZENG Zhi-ping;WANG Wei-dong;WANG Jun-dong;WU Zhi-peng(Central South University,Changsha,Hunan 410075,China;Key Laboratory of Engineering Structure of Heavy Railway of Ministry of Education,Central South University,Changsha,Hunan 410075,China)
出处
《铁道工程学报》
EI
北大核心
2018年第11期27-31,共5页
Journal of Railway Engineering Society
基金
国家自然基金重大项目(11790283)
高速铁路基础联合基金项目(U1734208)
中国铁路总公司科研试验课题(SY2016G001)
