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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0.3 H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。
In order to put forward the formula of the rupture surface and bearing capacity of reinforced Graben combined retaining wall (reinforced Graben + green reinforced Graben structure), through the analysis of the reinforced concrete structure of contract section 12 of Xiangtan-Hengyang West Expressway in Hunan Province The field experiment and monitoring were carried out to summarize the variation rules of strain in each layer, and a new fracture line potential fracture surface based on simplified H / 3 (H is wall height) was proposed. The common formula for calculating the bearing capacity of the top of the wall under failure mode is discussed. The ultimate bearing capacity formula of the wall under tension failure is discussed by using the limit equilibrium method, and the formula of bearing capacity under the 0.3 H simplified rupture surface and Rankine fracture surface is unified. And four kinds of standard reinforced earth typical rupture surface were compared. The results show that the calculated fracture surface is more economical than the highway code and the BS8006 code, and is more economical than the railway code. The reinforcement of the twisted hexagonal steel mesh is the result of tensile failure. The experimental results are consistent with the calculated results.