引水工程交叉建筑物结构性态互相影响分析

Analysis of Interaction Between Structural States of Cross Buildings in Water Diversion Projects

引调水工程不可避免地存在建筑物交叉跨越的情况,交叉建筑物结构性态关乎工程能否安全运行。依托河南省某输水工程,考虑输引水过程中土体—水体—结构间的耦合作用,建立南水北调中线工程倒虹吸和输水工程中输水管道结构交叉跨越的三维有限元模型,分别考虑结构未修建、完建期和正常运行期,分析各模拟工况下交叉建筑物结构性态影响。结果表明,建筑物交叉跨越会对既存建筑物产生一定影响,尤其是交叉部分结构性态改变较大,倒虹吸结构最大拉应力由0.54 MPa增至0.97 MPa,最大沉降量由-1.38 mm增至-1.90 mm;输水管道拉应力从1.03 MPa增至1.34 MPa,最大沉降量由-3.78 mm增至-4.07 mm,应力值、沉降量可满足工程要求;随着输水管道两道支承埋深增加,倒虹吸所受影响越小。研究结果可为类似工程分析提供参考。

Cross building is inevitable in water diversion projects,and the structural state of cross buildings is crucial to the safe operation of the project.Based on a water transfer project in Henan Province,a three-dimensional finite element model of cross-crossing of water pipeline structures in the inverted siphon and water transfer project of the South-North Water Transfer Central Project was established by taking into account the coupling effect between soil-water-structure in the process of water transfer and diversion.The structural state effect of cross building under each simulation operating condition was analyzed by considering the periods of unconstructed structure,completion,normal operating.The results show that the cross-crossing building has impact on the existing building,especially for the large change of structural state in cross part.The maximum tensile stress in the inverted siphon structure increases from 0.54 MPa to 0.97 MPa,and the maximum settlement increases from-1.38 mm to-1.90 mm;The tensile stress in the aqueduct increases from 1.03 MPa to 1.34 MPa,and the maximum settlement increases from-3.78 mm to-4.07 mm.The stress value and settlement amount can meet the engineering requirements.Moreover,with the increase of the buried depth of the two supports of the water pipeline,the less the impact on inverted siphon is.The research results can provide reference for the analysis of similar projects.