填料及隔断层对路基多场域影响的试验研究  

Experimental Research on the Influence of Filler and Partition Layer on Subgrade Multi-Field

作　　者：高江平[1] 阿不都沙拉木·买买提艾力 杨含 彭秋玉 GAO Jiangpin;ABUDUSHALAMU·Maimaitiaili;YANG Han;PENG Qiuyu(Key Laboratory of Highway Engineering Ministry of Education in Special Areas,Chang'an University,Xi an 710064,Shaanxi,China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《重庆交通大学学报（自然科学版）》2020年第9期105-111,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(50578015);交通运输部西部交通建设科技项目(20033187950;20033187951)。

摘　　要：因盐渍土本身具有湿陷性、膨胀性和腐蚀性,加之西部地区地质情况复杂,气候恶劣,盐渍土地区筑路一直被视为世界性难题。为了给盐渍土地区道路修筑合理选择路基隔断形式提供理论和设计依据,通过在典型硫酸盐渍土路段现场铺设试验路,研究不同填料、不同隔断层条件下的路基温度场、盐分场及路面表面变形的变化规律。从试验结果可看出:填料的导热性能、渗水性能及力学性能是导致温度变化、盐分变化、水分变化及路面表面变形变化的主要原因。路基内部温度变化与外界气温变化呈正相关,但不同填料、有无隔断层各工况之间也存在着差异。当外界气温大于20℃时,路基内部温度与路基深度呈负相关;当外界气温小于20℃,路基内部温度与路基深度呈正相关。在路基深度100 cm处,横向温度差异主要在于路基左、右边坡受到太阳辐射的强度不同。在路基深度300 cm处,水平温度呈现伞形分布,其曲率与路基深度呈正相关;在深度200 cm以上,路基各断面盐分变化几乎一致,但有隔断层的路基盐分在100~120 cm处出现聚积;深度200 cm以下,各断面盐分变化因渗水能力的不同而存在差异。路表面变形量受两方面影响,即水分、温度引起的盐胀和冻胀以及土基自身重量引起的沉陷和溶陷。导热性能强的填料,路基内部温度与路基深度的相关性不明显,温度引起的热胀冷缩不明显,盐胀量相应小。力学性能强的,自身重量引起的沉陷量也小。Because of the collapsibility,expansibility and corrosiveness of saline soil itself,as well as the complex geological conditions and harsh climate in the western region,road construction in saline soil area has been regarded as a worldwide problem.In order to provide theoretical and design basis for reasonable selection of roadbed partition form in road construction in saline soil area,the variation law of subgrade temperature field,salinity field and surface deformation of roadbed with different fillers and diverse isolation conditions was studied by laying test road in the field of typical sulfuric acid saline soil section.From the test results,it can be seen that the thermal conductivity,water permeability and mechanical properties of the fillers are the main reasons for the changes of temperature,salinity,moisture and pavement surface deformation.The change of temperature inside the roadbed is positively correlated with the change of temperature outside,but there are also differences between different fillers and different working conditions with or without barrier faults.When the outside temperature is higher than 20℃,the temperature inside the subgrade is negatively correlated with the depth of the subgrade;when the outside temperature is less than 20℃,the internal temperature of subgrade is positively correlated with the depth of subgrade.At the subgrade depth of 100 cm,the difference of transverse temperature is mainly due to the different intensity of solar radiation on the left and right slopes of the subgrade.At the subgrade depth of 300 cm,the horizontal temperature presents umbrella-shaped distribution,and its curvature is positively correlated with the depth of roadbed.At the depth of 200 cm or more,the salinity change of each section of roadbed is almost the same,while salt accumulation occurs in the place of 100~120cm in the subgrade with partition layer.When the depth is below 200cm,the change of salt content in each section is different due to the different water seepage capacity.The deforma

关 键 词：道路工程 盐渍土 素土 温度场 导热能力 力学性能 

分 类 号：U416.166[交通运输工程—道路与铁道工程]