Abstract: The underside rectangular groove was selected as the structural type, and the indoor bearing plate method was used to conduct bending test research on the underside groove-shaped prefabricated block pavement. The deflection values of precast block pavement under different conditions such as different base layer types, sand cushion types, sand cushion thickness, and precast block types were studied by experiment. The critical deflection value L was used to evaluate the structural bearing capacity of the precast block pavement. The results show that for the same pavement structure combination, as the thickness of the sand cushion increases, the critical deflection value of prefabricated pavement structure increases, and the structure bearing capacity decreases. The structure bearing capacity of the precast block pavement with sand cushion mixed with 30% gravel is better than that with the ordinary sand cushion. The structure bearing capacity of the underside groove-shaped interlocking precast block USB pavement is better than that of the interlocking precast block IB pavement. The structure bearing performance of underside groove-shaped precast block pavement is better than that of ordinary precast block pavement. And the structure bearing performance of precast block pavement can be improved by selecting proper pavement base and sand cushion.

Key words: highway engineering; precast block pavement; underside groove-shaped precast block; critical deflection value; structure bearing capacity

摘要： 选用底部矩形槽这一结构型式，采用室内承载板法进行底部槽型预制块路面的弯沉试验研究。研究了不同基层类型、砂垫层类型、砂垫层厚度和预制块类型等工况下预制块路面的弯沉值，使用临界弯沉值L来评价预制块路面的结构承载力。结果表明：对相同的路面结构组合，随着砂垫层厚度的增大，预制块路面结构的临界弯沉值增大，结构承载力有所降低；掺入30%碎石的砂垫层的预制块路面结构承载力要优于普通砂垫层；底部槽型联锁预制块USB路面的结构承载力要优于联锁预制块IB路面；底部槽型预制块路面结构承载性能要好于普通预制块路面，通过选取合适的路面基层和砂垫层，更能提高预制块路面结构承载性能。

关键词: 道路工程；预制块路面；底部槽型预制块；临界弯沉值；结构承载力