预应力混凝土箱梁桥桥墩位移事故机理分析

发布时间：2018-12-14 00:53

【摘要】：针对桥墩位移事故致因的复杂性及分析过程的不确定性,以某预应力混凝土箱梁桥桥墩因上游侧的新填土造成堆载作用导致土体侧向位移影响桩基受力的位移事故项目为研究对象,通过现场检测、监测及理论分析了与数值模拟相结合的综合分析方法,模拟并分析桥墩位移事故的致因,梳理病害产生的内在机理。结合现场实际情况,以分级处理为处置原则,采用桩基顶推、墩顶牵引、设抗滑桩、平衡堆载等组合措施进行纠偏处理并对病害进行整治,使桥墩偏位回归至允许范围内,缺陷得到修复。在纠偏处理过程中对桥墩、抗滑桩和锚杆等进行动态监控,结果表明,各项位移指标符合要求,事故分析过程准确,所采取的方案有效合理,处置效果良好。该研究为同类事故事后调查及病害成因分析、纠偏处置提供了参考。
[Abstract]:In view of the complexity of the cause of the displacement accident of the pier and the uncertainty of the analysis process, In this paper, the displacement accident of the pier of a prestressed concrete box girder bridge which is affected by the lateral displacement of the soil caused by the surcharge caused by the new fill in the upstream side of the bridge is taken as the research object, and the site detection is carried out. A comprehensive analysis method combined with numerical simulation is presented to simulate and analyze the causes of displacement accidents of bridge piers and the internal mechanism of disease generation. Combined with the actual situation on the spot, taking the classification treatment as the treatment principle, the combined measures of pile foundation pushing, pier top traction, anti-slide pile and balanced heaped load are adopted to correct the deviation and to rectify the disease, so that the bridge pier deviation can be returned to the allowable range. The defect was repaired. Dynamic monitoring of bridge piers, anti-slide piles and anchors is carried out in the process of rectifying deviation. The results show that the displacement indexes meet the requirements, the accident analysis process is accurate, the scheme adopted is effective and reasonable, and the disposal effect is good. This study provides a reference for the investigation of similar accidents and the analysis of the causes of the disease.
【作者单位】：西安职业技术学院建筑工程系;西安建筑科技大学材料与矿资学院;陕西通宇公路研究所有限公司;
【基金】：国家自然科学基金(51178386) 住建部科技项目(2015-R3-003)
【分类号】：U447

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