无粘结环锚预应力衬砌锚具槽布置方式对比研究

发布时间：2018-04-05 03:23

本文选题：预应力衬砌　切入点：无粘结环锚　出处：《水利水电技术》2017年07期

【摘要】：无粘结环锚预应力衬砌锚具槽是整个预应力衬砌受力的关键部位,其位置的选择对于整个预应力衬砌受力和安全而言至关重要。结合引松供水工程有压输水隧洞无粘结预应力衬砌结构,采用等效荷载法和实体建模相结合的方法进行Flac3D三维建模,对锚具槽单排和双排布置时的衬砌关键部位受力情况进行了分析。计算结果表明:(1)无粘结环锚预应力衬砌的下半环因锚具槽的影响,会存在局部预应力缺失和分布不均,而单排锚具槽布置能减小衬砌预应力的不均匀性。(2)锚具槽及附近区域是预应力衬砌的薄弱区,衬砌拉应力区主要分布在锚具槽环向的临空面附近,衬砌受压最大区域分布在相邻锚具槽之间。(3)双排锚具槽布置型式抗超载能力优于单排锚具槽布置型式。
[Abstract]:Unbonded ring anchor prestressed lining slot is the key part of the prestressed lining, and the selection of its location is very important for the stress and safety of the whole prestressed lining.Combined with the unbonded prestressed lining structure of the pressurized water conveyance tunnel in the diversion water supply project, the Flac3D 3D modeling was carried out by combining the equivalent load method with the solid modeling method.The stress of the key part of the lining in single row and double row arrangement of Anchorage slot is analyzed.The calculation results show that the lower half ring of unbonded ring anchor prestressing lining will lack of local prestress and be distributed unevenly due to the influence of anchor slot.The single row Anchorage slot arrangement can reduce the inhomogeneity of the lining prestress. The Anchorage slot and its adjacent area are the weak areas of the prestressed lining. The lining tensile stress zone is mainly distributed near the annular empty surface of the Anchorage slot.The maximum area of lining under compression is distributed between adjacent anchors. 3) the arrangement of double row anchors is superior to that of single row of Anchorage grooves.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;北京航空航天大学交通科学与工程学院;
【基金】：国家重点研发计划课题(2016YFC0401801,2016YFC0401804) 中国水利水电科学研究院基本科研业务费专项项目(GE0145B452016,GE0145B822017)
【分类号】：TV554

【相似文献】