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为了提高传统路面嵌锁块尺寸与嵌锁块竖向嵌锁能力,开发了大尺寸企口连接嵌锁块,分析了其受力特性。以有限元方法建立了嵌锁块路面整体模型,以弹簧单元模拟嵌锁块间传荷能力,分析了嵌锁块尺寸、嵌锁块传荷能力、碎石基层厚度与路基强度对路表弯沉和路基顶面竖向压应变的影响。以路基顶面永久应变为控制指标,建立了路基顶面应变水平与标准累计轴次的关系。计算结果表明:在相同地基和基层条件下,嵌锁块尺寸由30cm×20cm增大到50cm×30cm时,路表弯沉可减小25%~30%,路基顶面压应变可减小25%~45%。当接缝弹簧弹性系数由102 N·m-1增加至108 N·m-1时,路表弯沉降低50%~55%,路基顶面压应变降低65%~75%。可见,采用较大尺寸的嵌锁块与加强嵌锁块的传荷能力对提升路面性能有显著作用,路面设计时应依据道路的交通水平查图确定路基顶面的压应变水平,据此确定合理的基层厚度和嵌锁块尺寸,使路基顶面竖向压应变满足要求。
In order to improve the traditional pavement interlocking block size and the vertical locking capacity of the interlocking block, a large-size interlocking interlocking block was developed and its force characteristics were analyzed. The whole model of embedded block road surface was established by finite element method. The spring unit was used to simulate the load carrying capacity of embedded block. The influence of embedded block size, load carrying capacity of embedded block, Influence of vertical compressive strain on the top of subgrade and subgrade. Taking the permanent strain of subgrade as the control index, the relationship between the level of strain on the top of subgrade and the standard accumulated shaft times is established. The calculation results show that the deflection of the road surface can be reduced by 25% -30% and the compressive strain at the top of the subgrade can be reduced by 25% when the block size increases from 30cm × 20cm to 50cm × 30cm under the same foundation and grassroots conditions % ~ 45%. When the elastic coefficient of joint spring increases from 102 N · m-1 to 108 N · m-1, the deflection of the road surface decreases by 50% -55% and the compressive strain on the road surface decreases by 65% -75%. It can be seen that using a larger size of the locking block and strengthening the carrying capacity of the locking block have a significant effect on improving the performance of the pavement. The design of the pavement should determine the level of compressive strain on the top of the subgrade based on the traffic level chart of the road, Reasonable grass-roots thickness and the size of the locking block, so that the vertical subgrade surface compressive strain to meet the requirements.