应用于冻土路基的XPS保温板力学性能

发布时间：2018-03-31 07:23

本文选题：道路工程　切入点：XPS保温板　出处：《中国公路学报》2015年12期

【摘要】：为解决G214线共和—结古公路冻土路基施工过程中出现的挤塑式聚苯乙烯(XPS)保温板路基弯沉不达标及选材标准等问题,针对不同厂家生产的XPS保温板开展了单轴压缩试验,得到了其弹性模量和抗压强度,采用数值方法研究了XPS保温板弹性模量对路基弯沉的影响规律,分别计算了其在施工荷载和工后荷载条件下的应力分布。基于计算结果提出了能够满足冻土路基设计要求的XPS保温板力学性能指标。研究结果表明:路用XPS保温板应同时满足以下2个条件,即为满足路基弯沉的设计要求,弹性模量应大于45MPa,为满足施工期和工后运营期的强度要求,抗压强度不得小于500kPa。
[Abstract]:In order to solve the problems of subgrade deflection of extruded polystyrene (PS) thermal insulation board and the standard of material selection, the uniaxial compression test was carried out for the XPS insulation board produced by different manufacturers in order to solve the problems in the construction of frozen soil roadbed of G214 line Gonghong-Jiegu Highway, such as subgrade deflection of extruded polystyrene (PS) thermal insulation board and material selection standard. The elastic modulus and compressive strength are obtained, and the influence of elastic modulus of XPS insulation board on subgrade deflection is studied numerically. The stress distribution under the conditions of construction load and post-construction load is calculated respectively. Based on the calculation results, the mechanical performance index of XPS thermal insulation board which can meet the design requirements of frozen soil subgrade is proposed. The research results show that the road XPS insulation board can be used for thermal insulation. The following two conditions shall be met simultaneously, In order to meet the design requirements of roadbed deflection, the elastic modulus should be greater than 45 MPA, and the compressive strength should not be less than 500 KPA in order to meet the strength requirements during the construction period and the operation period after construction.
【作者单位】：中交第一公路勘察设计研究院有限公司多年冻土区公路建设与养护技术交通行业重点实验室;西安通理昌弘管理咨询有限公司;
【基金】：“十二五”国家科技支撑计划项目(2014BAG05B01;2014BAG05B03) 交通运输部重大科技专项项目(2013 318 490 010);交通运输部建设科技项目(2012 319 495 030)
【分类号】：U416.168

【共引文献】