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为了研究深厚湿陷性黄土地基非埋式桩板结构路基的承载机制,选取试验段典型断面进行元器件布置与长期观测;考虑桩土相互作用,依据等刚度的原则引入综合转动刚度的概念,建立了纵、横向平面分析模型,对非埋式桩板结构的受力与变形特性进行测试分析。实测结果表明:结构主筋应力测试值与理论值相差10%～30%,吻合较好,最大值出现在托梁支座断面上侧,为60.60MPa;桩侧土体承受约95%的荷载,且未产生负摩阻力;桩板结构的荷载传递规律与传统路基不同,桩基将荷载传递到更深的持力层,改善了路基软弱土体部分的受力状态;轨道结构完工半年后,承台板顶面最大累计沉降出现在中跨跨中断面,为1.0mm,满足沉降控制要求。
In order to study the load-bearing mechanism of subgrade for non-buried pile structure with deep collapsible loess foundation, the typical sections of the test section are selected for the arrangement of components and long-term observation. Considering the interaction between pile and soil and the concept of integral rotation stiffness based on the principle of equal stiffness, The vertical and horizontal plane analysis models are established to test the stress and deformation characteristics of the non-buried pile structure. The measured results show that the stress value of the main reinforcement differs from the theoretical value by 10% ~ 30%, which is in good agreement with the maximum value of 60.60MPa on the upper side of the joist bearing section. The soil on the pile side receives about 95% And does not produce negative friction; pile load transfer structure of the traditional sub-base with different laws, the pile foundation will be transmitted to the deeper bearing layer, to improve the subgrade soft soil part of the stress state; The maximum cumulative settlement of the top plate in the mid-span cross-section, 1.0mm, to meet the settlement control requirements.