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加筋格宾组合式挡墙破裂面及承载力特性

, PP. 31-39

Keywords: 道路工程,加筋格宾组合式挡墙,现场试验监测,双绞合六边形钢丝网,新折线型破裂面

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Abstract:

?为提出加筋格宾组合式挡墙(加筋格宾+绿色加筋格宾结构)破裂面及承载力公式,通过对湖南省湘潭至衡阳西线高速公路第12合同段加筋土实体结构进行现场试验监测,总结了各层拉筋应变变化规律,提出了基于简化破裂面转折点位置为H/3(H为墙高)的新折线型潜在破裂面,推导了该折线型破裂面在2种破坏模式下的墙顶部表面承载力通用计算公式;采用极限平衡法,讨论了拉力破坏下其极限承载力公式,统一了0.3H简化破裂面和朗肯破裂面形式下的承载力计算公式,并与4种规范加筋土典型破裂面进行了比较分析。结果表明:采用该折线型破裂面计算,比公路规范和BS8006规范安全,比铁路规范经济;双绞合六边形钢丝网加筋为拉力破坏,试验结果与计算结果相吻合。

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