嵌锁块路面受力特性与设计方法

发布时间：2017-12-27 03:34

本文关键词：嵌锁块路面受力特性与设计方法　出处：《交通运输工程学报》2015年04期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to improve the traditional pavement interlocking block size and interlocking block vertical interlocking ability, development of large size enterprises connected interlocking blocks, analyzes its mechanical characteristics. With the finite element method of interlocking block pavement overall model, load transfer between the interlocking block to spring element simulation, analysis of the interlocking block size, interlocking block load transfer ability, gravel thickness and subgrade strength on deflection and subgrade vertical compressive strain. Based on the permanent strain of the subgrade top surface as the control index, the relationship between the strain level of the top surface of the subgrade and the standard accumulative axis is established. The calculation results show that under the same foundation and basic conditions of interlocking block size increases from 30cm to 50cm * 20cm * 30cm, the road surface deflection can be reduced by 25%~30% compression strain on top of subgrade can be reduced by 25%~45%. When the elastic coefficient of the joint spring is increased from 102 N. M-1 to 108 N. M-1, the deflection of the road surface is reduced by 50%~55%, and the pressure strain of the top surface of the subgrade is reduced to 65%~75%. Obviously, the larger size of the interlocking block and strengthen the load transfer ability of interlocking block has a significant effect on improving the performance of the pavement, the pavement design should be based on the road traffic information to determine the level of the top surface of subgrade compressive strain level, determine the reasonable base thickness and interlocking block size, the subgrade vertical compressive strain to meet the requirements.
【作者单位】：山东科技大学山东省土木工程防灾减灾重点实验室;新墨西哥州立大学工程技术与测绘学院;
【基金】：山东省自然科学基金项目(ZR2011EEQ027) 国家自然科学基金项目(51408346)
【分类号】：U416.2
【正文快照】： 2.新墨西哥州立大学工程技术与测绘学院,新墨西哥拉斯克鲁塞斯88003)0引言嵌锁块路面是指采用不同形状和尺寸的天然石块或预制块铺筑的路面。相比水泥混凝土和沥青混凝土路面,嵌锁块尺寸较小,对基础变形的适应能力较强,同时,嵌锁块可采用工厂化预制,不仅保证了嵌锁块的质量,而

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