土钉基坑支护的空间效应研究  

Space effect of soil-nailing excavation protection

作　　者：吴志敏[1] 屠毓敏[1] 

机构地区：[1]浙江大学土木工程学系,杭州310027

出　　处：《岩土力学》2007年第10期2178-2182,共5页Rock and Soil Mechanics

摘　　要：利用三维弹塑性模型研究了土钉基坑支护的空间效应,着重对深基坑工程中的阴角、阳角及分段分层开挖等问题进行了计算分析。结果表明,基坑的阴角能大大降低基坑位移和土钉轴力,其影响范围大于开挖深度,直立开挖面的阴角效应比放坡开挖面时的要大;阳角处的位移及土钉轴力明显增大,其影响范围延伸至3倍基坑开挖深度;分段分层开挖支护能充分利用土钉支护的空间效应,其影响范围接近于基坑开挖深度。A three-dimension elastoplastic model had been developed to study the space effect of the soil-nailing excavation protection. The positive comer effect, negative corner effect and layered excavation were emphatically analyzed. The researches showed that： the negative comer of excavation could reduce the displacement of excavation and the force of soil-nail; and its influence was once more than the depth of the excavation; meanwhile, the displacement of the excavation and the force of soil-nailing were much larger in the positive corner; and its influence is near to 3 times of the depth of the excavation; the space effect of soil-nailing pit could be used plenarily by layered excavation; its influence was near to the depth of the excavation. It was proved that three-dimension numeric analysis of the soil-nail structure was very useable.

关 键 词：深基坑 土钉支护 空间效应 有限元 弹塑性分析 

分 类 号：TU472.99[建筑科学—结构工程]