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首页> 美国政府科技报告 >Development of Testing Methods to Determine Interaction of Geogrid-Reinforced Granular Material for Mechanical Pavement Analysis
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Development of Testing Methods to Determine Interaction of Geogrid-Reinforced Granular Material for Mechanical Pavement Analysis

机译：确定土工格栅加筋颗粒材料相互作用的机械路面分析测试方法的研究进展

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摘要

A new method of examining soil stiffness based on the propagation of elastic waves is proposed and compared to traditional resilient modulus tests. A laboratory testing program is undertaken to study the effect ofchanging bulk stress, strain level, and void ratio on the velocity of elastic waves. Using a proposed formulation, low-strain (approximately 10-6 mm/mm) moduli calculated with seismic methods are converted to higher strain (approximately 3x10-4 mm/mm) resilient moduli. Results of this study indicate that resilient moduli are approximately 29% that of the seismic moduli based on stress and strain. A simplified seismic testing scheme that can be used on the soil surface was developed and provides an efficient method to compare seismic and resilient moduli. The new proposed methodology allows for the characterization of materials containing large grains (>25 mm) (e.g., breaker run, pit run sand and gravel) that cannot be easily tested with the current resilientmodulus methodology. Soil modulus and particle rotation were monitored using micro-electronic- mechanical-systems to determine the aggregate-geogrid interaction in base course materials. Velocity resultsindicate that the geogrid stiffens soil near the geogrid by a minimum factor of 1.3 (geogrid placed at a depth of 75 mm from the surface) to amaximum of 2.6 (geogrid at 100 mm depth).

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