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结合北京熊猫环岛地铁车站深基坑支护工程,通过对预应力锚索与土钉联合使用条件下土钉轴力随时间变化、土钉轴力沿长度的分布、土钉轴力最大值的分布、锚索预应力的变化等现场测试及分析,从力学机制上研究了预应力锚索复合土钉的工作机理,研究表明:(1)土钉受力具有时间效应及开挖效应;(2)土钉轴力形成和空间分布与基坑潜在滑动趋势有关;(3)预应力锚索对作用范围内土钉轴力空间分布有一定影响;(4)预应力锚索可减小坡体位移,使得各土钉轴力相对减小,改善坡体应力状态;(5)工作状态下,土钉和预应力锚索的受力状态变化相互影响较小,各自发挥作用。
Combined with the deep foundation pit supporting project of Beijing Panda Central Station, the distribution of axial force of soil nail along the length and the maximum axial force of soil nail under the condition of joint use of prestressed anchor cable and soil nail with time, Distribution and the change of prestressing force of anchor cable. The working mechanism of prestressed anchor cable with composite soil nail is studied from mechanics mechanism. The research shows that: (1) Soil nailing has time effect and excavation effect; ( 2) The formation and spatial distribution of soil nail axial forces are related to the potential slide tendency of foundation pit; (3) The prestressed anchor cables have some influence on the spatial distribution of soil nail axial forces within the scope of action; (4) Prestressed anchor cables can reduce the slope So that the axial forces of the soil nails decrease relatively and the stress state of the slope body is improved. (5) Under the working condition, the change of the stress state of the soil nails and the prestressed anchor cables has little influence on each other, each exerting a role.