颍河倒虹吸施工期基础变形特征分析

Analysis on deformation characteristics of Yinghe inverted siphon foundation in construction period

颍河倒虹吸是南水北调中线禹州和长葛段最大的河渠交叉建筑物,为了解倒虹吸工程施工期基础及管身的变形情况,对施工全过程进行了安全监测,并对建筑物基础监测成果进行了分析。分析认为:由于建筑物上部自重逐渐增加,底板下沉量也随之加大;底板界面应力大小与建筑物箱体自重、回填物荷载以及水压力荷载等相关;基础渗透压力主要受外水压力作用较为明显。

Yinhe inverted siphon works is the largest river-canal crossing structure in Yuzhou-Changge section of Middle Route Project of South-to-North Water Diversion. In order to master the deformation condition of foundation and pipe body of inverted siphon, the monitoring was conducted in the whole construction period. The analysis shows that the settlement of bottom plate interface increases with the gradual increase in self-weight of upper structure, the stress of bottom plate has relation with the box weight of structure, backfilling load and water pressure etc. , the seepage pressure is obviously influenced by water pres-sure.