| 摘要: |
| 于室内大型足尺环道试验场铺砌级配碎石柔性基层预制块铺面，通过承载力试验研究其承载力特性，分析了接缝宽度、砂垫层厚度、预制块几何尺寸等对预制块铺面承载力和力学参数的影响；通过环道试验建立了不同荷载作用次数(N)下预制块铺面永久变形（εp）的预估模型.结果表明：随着荷载的增加，预制块铺面弯沉值呈非线性增加；当接缝宽度为5mm、砂垫层厚度为2cm、预制块厚度为16cm时，预制块铺面的临界弯沉值约为195mm;当预制块长宽比介于119～181、厚度介于8～29cm时，预制块铺面荷载扩散系数介于116～142;当接缝宽度约为5mm、砂垫层厚度介于3～5cm时，预制块铺面永久变形影响系数可取085.预制块铺面永久变形预估模型为εp=16282lnN 5000+1+04821. |
| 关键词: 道路工程 柔性基层 预制块路面 力学行为 临界弯沉值 永久变形预估模型 |
| DOI：103969/jissn1007 9629201503018 |
| 分类号: |
| 基金项目:云南省交通科技项目（200909A010） |
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| Study of Mechanical Behavior and Parameters for Precast Block Pavement with Flexible Base |
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WANG Huoming1, WANG Xiu2, ZHOU Gang1, LING Tianqing3, XU Zhoucong1
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1.China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd.,Chongqing 400067, China;2.Hydropower Design Institute of Chongqing, Chongqing 400020, China;3.School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing 400074, China
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| Abstract: |
| By using a large full scale indoor ring road test on precast block pavement with graded gravel flexible base, the bearing capacity characteristics and mechanical parameters of precast block pavement were studied.The influences of joint width, sand cushion thickness, precast block geometrical dimensions on the bearing capacity of precast block pavement were investigated. The prediction model for permanent deformation(εp) of precast block pavement under different numbers(N) of load was established based on full scale ring road test results. The results show that, as the load increases, the deflection of precast block pavement increases nonlinearly. The critical deflection of precast block pavement is about 195mm when the joint width is 5mm, sand cushion thickness is 2cm and precast block thickness is 16cm. When the aspect ratio of precast block is from 119 to 181, the thickness of precast block is from 8cm to 29cm, the load diffusion coefficient of precast block pavement ranges from 116 to 142. When the joint width is about 5mm, sand cushion thickness is from 3cm to 5cm, the permanent deformation coefficient of precast block pavement is taken as 085. The prediction model for permanent deformation of precast block pavement is εp=16282lnN 5000+1+04821. |
| Key words: highway construction flexible base precast block pavement mechanical behavior critical deflection prediction model for permanent deformation |
