摘要
为研究水平荷载作用下黄土地区钢管—混凝土组合桩的横向抗力特性,结合山西芮城某光伏发电厂桩基工程现场试验结果,分析了在水平推力作用下钢管—混凝土组合桩桩顶位移梯度、地基土水平抗力比例系数等的变化规律。研究结果表明:随着水平推力增大,不同埋深桩桩顶位移梯度均呈不断增大变化趋势,水平推力每增加3 k N,桩顶位移平均增大8. 07×10-2mm·k N-1;随着水平推力增大,桩侧地基土水平抗力比例系数呈不断减小变化趋势,水平推力每增加3 k N,地基土水平抗力比例系数平均减小79. 22 MN/m4;随着桩顶水平位移量增大,桩周地基土水平抗力比例系数均呈不断减小变化趋势,且水平位移量平均每增加0. 95 mm,地基土水平抗力比例系数平均增大29. 84 MN/m4。
In order to analyze the lateral resistance characteristics of concretefilled steel tubes pipe in loess area under horizontal load,on the basis of a support project in Ruicheng city Shanxi province,this paper has researched on the change law of displacement gradient of concretefilled steel tubes pile,the horizontal resistance coefficient of the soil around pile under horizontal load The results show thatas the horizontal thrust increases,the topdisplacement gradient of piles with different buried depth shows a growing tendency while the ratio coefficient of foundation soil horizontal resist forcedecreases continuously. When the horizontal thrust is increased by 3 k N,the displacementincreases by 8.07 × 10-2 mm·k N-1 and the coefficient decreases by 79. 22 MN/m4. The horizontal resistance coefficient shows a decreasing trend with the increase of the horizontal displacement on the piles top,and theaverage value of horizontal resistance coefficient increased by 29.84 MN/m4 with the average increase of horizontal displacement 0. 95 mm.
引文
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