AASHTO R 50-2009 Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures《柔性路面结构的基层骨料用土工合成材料加固的标准实施规程》.pdf
《AASHTO R 50-2009 Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures《柔性路面结构的基层骨料用土工合成材料加固的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《AASHTO R 50-2009 Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures《柔性路面结构的基层骨料用土工合成材料加固的标准实施规程》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures AASHTO Designation: R 50-09 (2013)1American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4e R 50-1 AASHTO Stan
2、dard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures AASHTO Designation: R 50-09 (2013)11. SCOPE 1.1. This standard practice provides guidance to pavement designers interested in incorporating geosynthetics for the purpose of reinforcing the aggre
3、gate base course of flexible pavement structures. Geosynthetic reinforcement is intended to provide structural support of traffic loads over the life of the pavement. 1.1.1. For the purpose of this guide, base reinforcement is the use of a geosynthetic within, or directly beneath, the granular base
4、course. 1.1.2. When referring to geosynthetics, the discussion is limited to geotextiles, geogrids, or geogrid/geotextile composites. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: M 288, Geotextile Specification for Highway Applications 2.2. Other References: Geosynthetic Materials Association (GMA)
5、 White Paper I, “Geosynthetics in Pavement Systems Applications,” May 1999. Available at http:/ Geosynthetic Materials Association (GMA) White Paper II, “Geosynthetic Reinforcement of the Aggregate Base/Subbase Courses of Pavement Structures,” June 2000. Available at http:/ National Highway Institut
6、e (NHI) Participant Notebook, Geosynthetic Design and Construction Guidelines, April 1999. Available at www.nhi.fhwa.dot.gov. 3. INTRODUCTION 3.1. Because the benefits of geosynthetic reinforced pavement structures may not be derived theoretically, test sections are necessary to obtain benefit quant
7、ification. Studies have been done that demonstrate the value added by a geosynthetic in a pavement structure. These studies, necessarily limited in scope, remain the basis for design in this field. A summary of studies is included in GMA White Paper 1, “Geosynthetics in Pavement Systems Applications
8、.” 3.2. This standard practice is very empirical in nature and restricted to applications already demonstrated to be useful. The practitioner will need to consult the references and locate a tested section similar to that which is expected in their own design. In that way, the experimentally determi
9、ned benefit may be applied to the project being designed. 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4e R 50-2 AASHTO 4. TERMINOLOGY 4.1. Definitions: 4.1.1. base course reduction (BCR)percentage
10、 of the base or subbase thickness in a reinforced pavement, as compared to the base or subbase thickness in an unreinforced pavement with the same material components, such that equal life cycles for a defined failure state result between the two. 4.1.2. separationuse of a geotextile to prevent the
11、mixing of a subgrade soil and an overlying aggregate material. 4.1.3. stabilizationuse of a geotextile in wet, saturated conditions to provide the functions of separation and drainage. 4.1.4. traffic benefit ratio (TBR)ratio of the number of load cycles of a reinforced pavement structure to reach a
12、defined failure state to the number of loads for the same unreinforced section to reach the same defined failure state. 4.2. DiscussionUse of geotextiles for separation and stabilization applications is covered in M 288 and, therefore, is not included in this guide. 5. SUMMARY OF DESIGN METHOD 5.1.
13、The purpose of this guide is to provide the practitioner with general information regarding the use of a geosynthetic for reinforcement in a pavement structure. The guide will not provide step-by-step procedures for the design of the geosynthetic in this application; instead, overall design consider
14、ations are outlined. 5.2. Design procedures use experimentally derived input parameters that are often geosynthetic specific. Thus, computed engineering designs and economic benefits are not easily translated to other geosynthetics. Users of this document are encouraged to affirm their designs with
15、field verification of the reinforced pavement performance, both in engineering design and economic benefits. 6. SIGNIFICANCE AND USE 6.1. Geosynthetics are used in the pavement structure for structural support of traffic loads over the design life of the pavement. The geosynthetic is expected to pro
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