级配碎石混合料及其基层的抗剪性能.pdfVIP

Vo l. 40 No.8 第 40 卷第8 期 哈尔滨工业大学学报 2008 年8 月 JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY Aug. 2008 级配碎石混合料及其基层的抗剪性能 王龙解晓光采海2 (1.哈尔滨工业大学交通科学与工程学院，哈尔滨 150090 ， E-mail: hitlongwang@; 2. 吉林省公路勘察设计院，长春 132001 ) 摘 要:为了研究级配碎石基层在路面结构中能否发生剪切破坏，对级配碎石基层材料抗剪强度及在路面 结构中的剪应力进行了对比研究;应用高精度静三轴仪对选定的级配碎石进行振动成型和击实成型的抗剪 强度研究，揭示不同成型方法对抗剪强度的影响，采用有限元分析典型路面结构在标准荷载作用下剪应力的 大小，明确级配碎石基层发生剪切破坏的可能性;三轴试验表明振动成型级配碎石过渡层的抗剪强度为 0.17 MPa ，击实成型的为 0.14 MPa，振动成型试样比击实的抗剪强度提高 20% ;剪应力分析表明:水平荷载 在级配碎石基层中产生的最大剪应力在 0.04 - O. 05 MPa; 级配碎石的抗剪强度是最大结构剪应力的 3.5 倍，级配碎石基层在高等级沥青路面结构中产生剪切破坏的可能性很小. 关键词:级配碎石;振动成型;三轴试验;剪切强度 中图分类号: U416.214 文献标识码:A 文章编号: 0367 -6234(2008)08 -1265 -04 Shear characteristics of graded aggregate materials and graded aggregate base I I 2 WANG Long , XIE Xiao-guang , LUAN Hai (1. School of Traffic Science and Engineering on Communications , Harbin Institute of Technology , Harbin 150090 , China , E-mail: hitlongwang@;2.JilinHighwaySurveyandDesignInstitute.Changchun130021.China) Abstract: In order to study the breakage possibility of graded aggregate base in asphalt pavement structure , the shear strength of graded macadam materials and the shear stress of graded macadam base were researched. By applying a medium scale triaxial apparatus , the shear performances of grade macadam were carried out , the influence of different compaction methods on shear strength was proclaimed; through the structural shear strength analysis , the breakage possibility of grade aggregate ba