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首页> 外文期刊>The international journal of pavement engineering & asphalt technology >SUBGRADE STRENGTH CHARACTERIZATION FOR LOW VOLUME ROADS IN INDIA
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SUBGRADE STRENGTH CHARACTERIZATION FOR LOW VOLUME ROADS IN INDIA

机译：印度小体积道路的路基强度表征

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摘要

Elastic moduli of pavement layers are essential inputs for mechanistic design of new pavements and rehabilitation of in-service pavements, of which subgrade is the most important layer. AASHTO has suggested the use of resilient modulus value for characterizing the subgrade, but due to the complexity of conducting the repeated load triaxial tests in the laboratory, different field tests are usually adopted for evaluation of subgrade modulus. Though using Falling Weight Deflectometer (FWD) is a rational approach, its extensive use for evaluation of pavements is not affordable for most rural road organizations because of the high initial and maintenance costs associated with the equipment. Low volume road pavements in India generally comprise of one or more granular layers laid over the subgrade and surfaced with thin bituminous carpet. In the present investigation, an effort has been made to correlate the results obtained from the evaluation of the subgrade using FWD with the results of Dynamic Cone Penetrometer (DCP) tests conducted on subgrade. Another correlation was developed between the field DCP value and laboratory CBR determined under field conditions. Using the results from the field DCP and FWD evaluation and laboratory CBR tests, a correlation between the laboratory CBR and the backcalculated subgrade modulus was established. The work reported in this paper is a step in the direction of rationalization of design of rural roads in India.
机译：路面层的弹性模量是新路面的机械设计和在役路面修复的必要输入，其中路基是最重要的层。 AASHTO建议使用弹性模量值来表征路基，但是由于在实验室中进行重复载荷三轴测试的复杂性，通常采用不同的现场测试来评估路基模量。尽管使用减重偏折仪（FWD）是一种合理的方法，但是对于大多数农村公路组织而言，由于其高昂的初始和维护成本，其在路面评估中的广泛使用是无法承受的。印度的低体积路面通常由一层或多层颗粒状的层组成，这些颗粒层铺在路基上并铺有薄薄的沥青地毯。在当前的调查中，已经进行了努力，以将使用FWD对路基的评估结果与对路基进行的动态锥孔渗透仪（DCP）测试的结果进行关联。在野外条件下测定的野外DCP值与实验室CBR之间建立了另一种相关性。利用现场DCP和FWD评估结果以及实验室CBR测试的结果，建立了实验室CBR与反算路基模量之间的相关性。本文报道的工作是朝着印度乡村道路设计合理化方向迈出的一步。

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