【摘要】：本文以粉質粘土和粉質砂土中的深基坑土釘支護為研究對象，通過自主設計的物理模型試驗系統(tǒng)，對土釘作用機理及土釘墻的工作特性進行研究。首先介紹了試驗所需的物理模型、測試系統(tǒng)及試驗實施過程；然后詳細分析了土壓力、土釘軸力、墻頂水平位移在各步開挖及加載狀況下的分布變化規(guī)律；并且在物理模型試驗的基礎上進行了FLAC3D模擬研究，最后結合具體工程進行了土釘支護的應用研究。通過一系列研究發(fā)現（1）開挖中墻內各測點側向土壓力先增大后減小再逐漸增加，而坑底土壓力則一直增大；（2）就某一層土釘而言，其下部緊臨土層開挖對其軸力影響最大，且墻體水平位移較大處附近的土釘軸力也較大；（3）土體開挖是墻體產生位移的主要原因，隨開挖的進行，墻體位移不斷增加，，且在墻頂施加一定均布荷載時，墻頂水平位移隨荷載的增大近似線性增長；（4）當土質為粉質砂土時，土釘墻的水平位移的最大值應控制在基坑開挖深度的4‰以下，當大于4‰后，應立刻采取其他輔助措施以保證墻體穩(wěn)定。
[Abstract]:In this paper, the soil nailing support of deep foundation pit in silty clay and silty sandy soil is taken as the research object, and the mechanism of soil nailing and the working characteristics of soil nailing wall are studied through the self-designed physical model test system. Distribution and variation of nail axial force and horizontal displacement of the top of the wall under different excavation and loading conditions were studied by FLAC3D simulation on the basis of physical model test. Finally, the application of soil nailing support was studied in combination with specific projects. The soil pressure at the bottom of the pit increases gradually when the soil nail is small and then small; (2) For a certain layer of soil nail, the excavation at the bottom of the soil nail has the greatest influence on its axial force, and the axial force of soil nail near the large horizontal displacement of the wall is also large; (3) soil excavation is the main reason for the displacement of the wall, with the excavation, the displacement of the wall increases continuously, and the displacement of the wall increases. When a certain uniform load is applied on the top of the wall, the horizontal displacement of the top increases approximately linearly with the increase of the load; (4) When the soil is silty sand, the maximum horizontal displacement of the soil nailing wall should be controlled below 4 of the excavation depth of the foundation pit, and when it is greater than 4, other auxiliary measures should be taken immediately to ensure the stability of the wall.
【學位授予單位】：中國礦業(yè)大學（北京）
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TU476

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本文編號：2199399