【摘要】 针对国内用FLAC对基坑复合土钉墙支护结构动力响应分析的空白,通过预应力锚杆复合土钉支护的试验基坑以土钉和锚杆的轴力为研究对象,在静力和动力两种工况下进行模拟。结果表明:两种工况下,土钉轴力沿长度方向为两端小、中间大,基本呈枣核形;土钉因所处位置不同发挥的作用有差异,但在动载荷作用下基本都呈增加趋势;预应力锚杆的最大轴力在自由段且相同,地震作用对锚固段轴力影响较大,其最大变化达81.4%;通过支护结构轴力分析,提出了布设预应力锚杆的合理位置。更多还原

【Abstract】 For the dynamic response of composite soil nailed wall supporting structure has not been analyzed using FLAC in China,the test foundation pit supported by prestressed rock bolt and soil nailing is simulated by studying the axial force of soil nailing and rock bolt under static and dynamic condition.It is indicated that under both conditions,the axial force of soil nailing is weak in ends and strong in the middle along length,basically shaped as a date pit.The action of soil nailing is different in different positions,but it trends to increase under dynamic load.The maximum axial force of prestressed rock bolt is at free section,where it keeps the same.The axial force in anchorage section is largely affected by earthquake,with the maximum changes reaching 81.4 %.Through axial force analysis of supporting structure,the reasonable position of prestressed rock bolt is advanced.更多还原