土工格栅加筋砂土复合体极限承载能力分析

徐超; 梁程

doi:10.11779/CJGE2019S1056

土工格栅加筋砂土复合体极限承载能力分析 English Version

徐超^{1, 2},
梁程^2, ,

1. 同济大学岩土及地下工程教育部重点实验室,上海 200092;
2. 同济大学土木工程学院地下建筑与工程系,上海 200092

基金项目: 科技部国家重点研发计划-政府间国际科技创新合作重点专项（2016YFE0105800）; 国家自然科学基金项目（41772284）

详细信息

作者简介:
徐超(1965—),男,博士,教授,博士生导师,主要从事土工合成材料加筋土结构和地基加固方面的科研和教学工作。E-mail:c_axu@tongji.edu.cn。

通讯作者:
梁程，E-mail：92chengliang@tongji.edu.cn

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出版历程
- 收稿日期: 2019-04-27
- 发布日期: 2019-07-14

Ultimate bearing capacity of geogrid-reinforced sand composite

XU Chao^{1, 2},
LIANG Cheng^2, ,

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 土工合成材料加筋土桥台可以有效减小桥梁与路基之间的差异沉降,避免“桥头跳车”现象的发生。为了计算土工合成材料加筋土复合体在设计中承受荷载的安全冗余度,对其极限承载能力进行了分析。首先讨论了评价加筋土复合体极限承载能力的计算公式,并提出了该公式是否适用于评价加筋细颗粒土复合体承载性能的问题。然后在平面应变的条件下,进行了5组土工格栅加筋砂土模型试验和1组无加筋模型试验,考虑了加筋间距和筋材强度对加筋砂土复合体极限承载能力的影响,并将试验结果与公式的计算结果进行对比,发现该公式低估了加筋砂土的承载能力。基于莫尔库仑破坏准则,并假定加筋土的破坏面符合朗肯破坏面,提出了预测加筋砂土极限承载能力的分析模型,并将模型的计算值与试验值进行对比,发现两者基本吻合。
- 土工合成材料 /
- 加筋土桥台 /
- 莫尔-库仑准则 /
- 极限承载能力 /
- 平面应变
Abstract: The differential settlement generated between the bridge deck and the approaching road willn be eliminated and bridge jump will also be prevented if geosynthetic-reinforced soil abutment is employed. To calculate its safety redundancy in the design, the ultimate bearing capacity of the geosynthetic-reinforced soil composite needs to be computed. Firstly, the model for calculating the ultimate bearing capacity of the geosynthetic-reinforced soil mass proposed by Wu and Pham is analyzed, and whether this model has the capability to predict the ultimate bearing capacity of geosynthetic-reinforced fine grained soil is questioned. To verify this problem, five geogrid-reinforced sand model tests and one unreinforced soil model test are then conducted under plain strain condition. The effects of reinforcement spacing and strength on the ultimate bearing capacity of the geosynthetic-reinforced soil are considered in the model tests. A comparison is made between the test results and those calculated using the model proposed by Wu and Pham. It is found out that the model proposed by Wu and Pham underestimates the ultimate bearing capacity of the geogrid-reinforced sand. Finally, a new analytical model is put forward based on the failure criterion of Mohr-Coulomb and the assumption of Rankine failure surface. The results calculated using the proposed model are coincident well with those obtained from the model tests.
- geosynthetic /
- geosynthetic-reinforced soil abutment /
- Mohr-Coulomb criterion /
- ultimate bearing capacity /
- plain strain

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参考文献(11)

[1]	ADAMS M T, NICKS J E, STABILE T, et al.Geosynthetic reinforced soil integrated bridge system interim implementation guide[R]. Final Report, FHWA-HRT-11-026. McLean: Federal Highway Administration, 2011.
[2]	ADAMS M T, NICKS J E, STABILE T, et al.Geosynthetic reinforced soil integrated bridge system synthesis report[R]. Final Report, FHWA-HRT-11-027. McLean: Federal Highway Administration, 2011.
[3]	SAGHEBFAR M, ABU-FARSAKH M, ARDAH A, et al.Performance monitoring of geosynthetic reinforced soil integrated bridge system (GRS-IBS) in Louisiana[J]. Geotextiles and Geomembranes, 2017, 45(2): 34-47.
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[8]	WU J T H, LEE K Z Z, PHAM T. Allowable bearing pressures of bridge sills on GRS abutments with flexible facing[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(7): 830-841.
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土工格栅加筋砂土复合体极限承载能力分析 English Version

作者简介: 徐超(1965—),男,博士,教授,博士生导师,主要从事土工合成材料加筋土结构和地基加固方面的科研和教学工作。E-mail:c_axu@tongji.edu.cn。

通讯作者: 梁程，E-mail：92chengliang@tongji.edu.cn

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出版历程

Ultimate bearing capacity of geogrid-reinforced sand composite

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目录

作者简介:
徐超(1965—),男,博士,教授,博士生导师,主要从事土工合成材料加筋土结构和地基加固方面的科研和教学工作。E-mail:c_axu@tongji.edu.cn。

通讯作者:
梁程，E-mail：92chengliang@tongji.edu.cn