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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第12期    总第256期    2015年12月

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文章编号:1672-7207(2015)12-4640-07
土工格室加筋碎石基层变形机理的数值模拟
汪海年1, 2,张然1,周俊1,刘玉1,尤占平1, 3

(1. 长安大学道路结构与材料交通行业重点实验室,陕西西安,710064;
2. 中交通力建设股份有限公司,陕西西安,710075;
3. 密歇根理工大学土木工程与环境系,霍顿美国,49931
)

摘 要: 为了研究土工格室加筋碎石柔性基层材料的力学性能与变形机理,采用离散-连续耦合的方法对粒径为10~20 mm和20~30 mm的2档碎石和带有级配的碎石填料,以及3种最大粒径(NMAS)分别为37.500,31.500和26.500 mm的连续级配的集料碎石结构层在加载过程中的力学性能进行数值计算。同时对800 mm/200 mm(格室焊距/格室高度),600 mm/200 mm和400 mm/150 mm这3种类型的土工格室加筋结构层进行力链分析。研究结果表明:在同一型号的土工格室下,不同填料结构层承载能力大小排序为:级配碎石;粒径为20~30 mm的碎石;粒径为10~20 mm的碎石。当连续级配碎石的公称最大粒径为31.500 mm时,土工格室加筋碎石结构层的承载能力最好。碎石结构层加筋后,加载板正下方区域的平均应力较未加筋时的应力增大38.4~49.5 kPa,同时传递到下承层中心区域的荷载减小25.9~40.0 kPa,强力链分布明显受到了一定的限制,强力链主要分布在土工格室范围内,弱力链主要分布在土工格室范围外。

 

关键字: 道路工程;土工格室;级配碎石;力链分析;数值模拟

Numerical simulation of deformation mechanism ofgeocell reinforced gravel base course
WANG Hainian1,2, ZHANG Ran1, ZHOU Jun1, LIU Yu1, YOU Zhanping1,3

1. Key Laboratory of Road Structure and Material Transportation, Chang’an University, Xi’an 710064, China;
2. Zhongjiaotongli Construction Co. Ltd., Xi’an 710075, China;
3. Department of Civil and Engineering Environment, Michigan Technology University, Houghton 49931, USA

Abstract:The discrete-continuous coupling technique was applied to investigate the mechanical properties and deformation mechanism of the geocell reinforced gravel base on the process of loading. Two groups of materials were analyzed, including the gravels consisting with particle sizes of 10-20 mm and 20-30 mm, graded gravel, and three different kinds of continuous gradation gravels with nominal maximum aggregate sizes (NMAS) of 37.500, 31.500 and 26.500 mm, respectively. Meanwhile, the force chains of different geocell reinforced structures were analyzed, with the geocell models (torch/height) being 800 mm/200 mm, 600 mm/200 mm, and 400 mm/200 mm. The results show that with the same model of geocell, the graded gravel layer structure has the maximum bearing capacity, and that the gravel with single size of 20-30 mm, and the gravel with single size 10-20 mm have the minimum bearing capacity. The continuous graded gravel layer structure with 31.500 mm has the maximum bearing capacity. Compared with the stress of unreinforced gravel, the average stress of geocell reinforced gravel below the loading plate area increases about 38.4 kPa to 49.5 kPa, and the loading to the center area of the bearing layer is reduced about 25.9 kPa to 40.0 kPa after reinforcement. The strong chain is mainly distributed in the scope of geocell which is obviously limited in some areas, while the weak chain is mainly distributed out of the geocell.

 

Key words: road engineering; geocell; graded gravel; force chain analysis; numerical simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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