土钉墙支护结构破裂角的研究.pdf

2011年4月上 施工技术 第40卷第338期 CONSTRUCTION TECHNOLOGY 土钉墙支护结构破裂角的研究 袁洪升 (廊坊师范学院建工学院,河北廊坊065000 摘要]土订支护技术已广泛应用于一般的基坑和边坡工程中,规范中对土钉支护结构进行设计时,采取破裂面为 直线,破裂角取452借助准黏聚力理论认为土体中设置土钉后体的内摩擦角不变而粘聚力变大土体 的抗剪强度增强。而且在上体中设置上钉后,改变了土体的应力状态,主应力方向发生偏转,体的滑裂面相应改 变。通过对土钉支护结构中的土体单进行应力分析,得出了垂直基坑中土钉支护结构滑移面的破裂角为45°+ 2-8结果表明土钉剪切滑移面破裂角与土体内摩擦角和七钉倾角有关,均成线性关系。 关键词】土钉墙准黏聚力;应力莫尔圆;滑移面;破裂角 中分类号]TU413.62 文献标识码】A 文章编号1002-8498(2011)07-0041-03 Research on Rupture Angle of Soil-nailing Wall Structure Yuan Hongsheng ( Instituteof Engineering and Architecture ,Langfang Teachers College ,Langfang ,Hebei 065000 ,China ) Abstract :Soil-nailing support technology is applied in general foundation excavation and slope widely . The rupture plane of soil-nailing structure is thought as a straight line and the rupture angle is 45 +/2 in standard .Based on theory of pseudo-cohesion ,the angle of internal friction of soil is invariant while the cohesion is getting bigger and shear strength of soil is getting strengthened after the soil-nailing is fixed in the soil .When the soil-nailing is fixed in the soil ,the stress state of soil is changed ,the principal stress direction deflects and the rupture plan changes in response .The formu...