【摘要】：以延安新區(qū)黃土溝壑高填方工程中的PVC輸水管道為原型,通過(guò)1:2物理模型試驗(yàn),預(yù)設(shè)沉降底板模擬高填方的工后沉降過(guò)程,對(duì)比不同接口布設(shè)位置的管道在穿越填挖結(jié)合場(chǎng)地時(shí)的受力變形過(guò)程,采集管道變形、應(yīng)變和管土接觸壓力等數(shù)據(jù),對(duì)比不同接口位置對(duì)管道的影響。研究表明:淺埋PVC管道受負(fù)土拱效應(yīng)影響明顯,深層沉降量超過(guò)6 mm后填方場(chǎng)地中管道底部與土體出現(xiàn)脫空,管道豎向變形明顯。對(duì)比2根管道的內(nèi)力曲線發(fā)現(xiàn),填挖結(jié)合部位中管道的內(nèi)力受支座轉(zhuǎn)角與豎向位移控制,管道接口的不良影響在這一階段開(kāi)始顯現(xiàn),建議在填挖結(jié)合區(qū)和工后沉降量大的填方場(chǎng)地采用柔性接口設(shè)計(jì)。
[Abstract]:Taking the PVC water conveyance pipeline in the loess gully high fill project in Yan'an New area as the prototype, the postconstruction settlement process of the high fill is simulated by the preset settlement bottom plate through the 1:2 physical model test. The stress and deformation process of pipeline with different interface location is compared, and the data of pipeline deformation, strain and tube-soil contact pressure are collected, and the influence of different interface location on pipeline is compared. The results show that the shallow PVC pipeline is obviously affected by the negative soil arch effect, the deep settlement is more than 6 mm and the pipe bottom and soil in the filling site appear to be empty, and the vertical deformation of the pipeline is obvious. Comparing with the internal force curves of two pipes, it is found that the internal force of the pipeline in the filling and digging joint position is controlled by the angle of the pedestal and the vertical displacement, and the bad influence of the pipe interface begins to appear at this stage. It is suggested that flexible interface design should be adopted in the filling and excavation area and in the filling site with large settlement after construction.
【作者單位】： 長(zhǎng)安大學(xué)地質(zhì)工程與測(cè)繪學(xué)院;陜西科技控股集團(tuán)有限責(zé)任公司;
【基金】：陜西省重點(diǎn)科技創(chuàng)新團(tuán)隊(duì)計(jì)劃項(xiàng)目(2016KCT-13) 陜西省重點(diǎn)產(chǎn)業(yè)創(chuàng)新鏈“社會(huì)發(fā)展領(lǐng)域”資助項(xiàng)目(2015KTZDSF03-02) 陜西省社會(huì)發(fā)展科技攻關(guān)項(xiàng)目(2016SF-455)
【分類號(hào)】：TU991.05

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