基于ANSYS的浑河拦河闸静力学分析

Static Analysis of Hun River Sluice Based on ANSYS

水闸工程经过多年运行后可能会出现一些病险问题,难以发挥其既定作用。因此,对水闸进行安全稳定性分析,查明其危险部位就显得尤为重要。水闸安全分析常采用数学计算方法或利用安全评价体系来进行,但是计算过程繁杂,且无法直观了解水闸结构的病险或失事部位。采用数值模拟方法则可以直观、准确地展示出水闸各部位的安全状态。为此,结合浑河闸工程实际,利用ANSYS Workbench有限元软件,建立闸室-地基整体模型,进行完建期、正常蓄水位期两种工况下的静力计算,模拟、分析闸室位移以及应力变化情况。考虑到闸底板不同部位应力变化明显且易出现应力集中现象,所以针对闸底板应力变化进行详细分析。在此基础上,进行稳定分析验算进而判定水闸结构的安全稳定性。结果表明:完建期、正常蓄水位期闸室最大沉降量分别为13.40 cm和13.83 cm,均在规范允许范围内;完建期、正常蓄水位期最大拉应力分别为2.03 MPa和2.93 MPa,超过C25混凝土轴心抗拉强度标准值,但仅出现在个别节点,且在钢筋混凝土材料抗拉性能承受范围内,经过拉应力复核计算满足要求,判断不会影响闸室整体稳定性;完建期、正常蓄水位期最大压应力分别为3.41 MPa和5.14 MPa,均在C25混凝土允许抗压能力限度内;闸底板上、下游的拉、压应力略大于中游;闸室结构最危险的部位为闸墩与闸底板的交界处,此处出现应力集中现象,运行中可采取相关措施调整应力状态。稳定分析验算中两种工况下的闸室抗滑稳定安全系数、不均匀系数、基底应力均满足相应规范要求。本研究为已有水闸的维修加固和新建水闸的建设及配筋处理提供了一定的参考依据。

After years of operation,the sluice may have some dangerous problems,which is difficult to play its established role.Therefore,it is particularly important to analyze the safety and stability of the sluice and find out its dangerous parts.The safety analysis of sluice is often carried out by mathematical calculation method or safety evaluation system,but the calculation process is complicated and it is impossible to intuitively understand the dangerous or crashed parts of sluice structure.The safety state of each part of the sluice can be displayed intuitively and accurately by using the numerical simulation method.Therefore,combined with the practice of Hun River sluice project,this paper establishes the overall model of sluice chamber foundation by using ANSYS Workbench finite element software,carries out static calculation under two working conditions of completion period and normal water level period,and simulates and analyzes the displacement and stress change of sluice chamber.Considering that the stress changes in different parts of the soleplate are obvious and prone to stress concentration,the stress changes of the soleplate are analyzed in detail.On this basis,stability analysis and checking calculation are carried out to determine the safety and stability of the sluice structure.The results show that the maximum settlement of the sluice chamber in the completion period and the normal water level period are13.40 cm and 13.83 cm respectively,which are within the allowable range of the specification;The maximum tensile stress in the completion period and the normal water level period is 2.03 MPa and 2.93 MPa respectively,which exceeds the standard value of C25concrete axial tensile strength,but only appears at individual nodes,and within the bearing range of tensile performance of reinforced concrete materials.It is judged that it will not affect the overall stability of the sluice chamber by referring to the relevant studies of other scholars;The maximum compressive stress in the completion period and normal water level period are 3.41 MPa and 5.14 MPa respectively,after mechanical review and calculation,it meets the requirements,which are within the allowable compressive capacity of C25 concrete;The tensile and compressive stresses at the upstream and downstream of the soleplate are slightly greater than those at the midstream;The most dangerous part of the sluice chamber is the junction of the gate pier and the soleplate,where stress concentration occurs.Relevant measures can be taken to adjust the stress state during operation.In the stability analysis and check calculation,the anti-sliding stability safety coefficient,non-uniformity coefficient and base stress of sluice chamber under the two conditions meet requirements of the corresponding specifications.The study provides a certain reference basis for the maintenance and reinforcement of existing sluice and the construction and reinforcement treatment of new sluice.