【摘要】：為研究重力式橋墩在泥石流沖擊作用下的安全性,以某既有鐵路重力式橋墩結(jié)構(gòu)作為研究對象,采用ANSYS+CFX建立了泥石流沖擊橋墩的流固耦合分析模型,分析橋墩在不同參數(shù)的泥石流沖擊作用下的響應(yīng)情況,同時采用LS-DYNA軟件分析泥石流中大塊石對橋墩的沖擊力,進(jìn)而對橋墩的安全性進(jìn)行評估。結(jié)果表明:隨著速度、容重和黏度的增加,泥石流沖擊力也隨之增加;泥石流中大塊石對橋墩的沖擊力較大,分析中不可忽略;橋墩在泥石流沖擊、大塊石沖擊以及橫向風(fēng)荷載作用下,橋墩的橫向偏心距、抗傾覆穩(wěn)定性、抗滑穩(wěn)定性、基底應(yīng)力均難以滿足規(guī)范要求。因此,應(yīng)加強(qiáng)對可能遭遇泥石流災(zāi)害的重力式橋墩的監(jiān)測和分析,采取有效措施以確保泥石流沖擊作用下結(jié)構(gòu)安全可靠。
[Abstract]:In order to study the safety of gravity pier under the impact of debris flow, taking the gravity pier structure of an existing railway as the research object, the fluid-solid coupling analysis model of debris flow impact pier is established by using ANSYS CFX. The response of bridge pier under the impact of debris flow with different parameters is analyzed. At the same time, LS-DYNA software is used to analyze the impact force of large rock masses on the pier, and then the safety of the pier is evaluated. The results show that with the increase of velocity, bulk density and viscosity, the impact force of debris flow also increases; Under the action of large rock impact and transverse wind load, the lateral eccentricity, the stability against overturning, the stability against sliding and the stress of the base are all difficult to meet the requirements of the specifications. Therefore, it is necessary to strengthen the monitoring and analysis of the gravity pier which may be affected by debris flow, and take effective measures to ensure the safety and reliability of the structure under the impact of debris flow.
【作者單位】： 西南交通大學(xué)橋梁工程系;
【基金】：國家自然科學(xué)基金項目(51478400) 鐵道部科技研究開發(fā)計劃重大課題(Z2012-061)~~
【分類號】：U445.75;U447

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