岩基上水闸结构分析计算

发布时间：2018-05-13 12:23

本文选题：水闸 + 岩基　；参考：《扬州大学》2016年硕士论文

【摘要】：水闸地基有土基和岩基之分,一般而言土基上的水闸结构分析研究较多,而岩基上水闸结构分析还有待加强研究。传统上水闸结构计算,是把各部件单独分开计算,该方法虽然简单,但没有考虑结构间相互作用,有时偏离实际情况。空间结构的水闸受力情况比较复杂,更为合理的方法是将岩基和闸室结构作为一个整体,充分考虑两者间的相互作用。本文以江苏省某岩基上水闸作为研究对象,利用ABAQUS有限元软件对闸室结构进行分析计算。全文主要内容有：1、介绍了水闸结构计算的传统方法,重点阐述了岩基上水闸底板结构计算的文克尔地基梁法。同时阐述了岩基上水闸结构计算的有限元法以及ABAQUS软件在水闸结构分析中的运用。2、通过分析岩基深度、岩基弹性模量与底板弹性模量的比值、底板厚度和闸墩厚度变化对水闸底板内力的影响,可得出以下结论：(1)文克尔假定(即基床系数法)用于岩基上水闸底板内力分析是可行的；(2)岩基弹性模量与底板弹性模量的比值E/Ec越大,底板跨中弯矩值越小,底板中间处地基反力越大,但当两者弹性模量数值相近时底板跨中弯矩值及地基反力的变化幅度较小；(3)底板厚度越大,地基反力也随之增加,底板跨中弯矩在减小,而闸墩处底板弯矩在增加；(4)闸墩厚度越大,底板跨中弯矩越小,地基反力越大。其中比值E/Ec和底板厚度的变化对岩基上水闸底板内力的影响较大。3、分别建立了分离式和整体式两种闸室结构有限元模型,计算结果经对比分析可知：整体式水闸结构的沉降和不均匀沉降相对较小,但与分离式底板沉降相比,整体式底板沉降减小不明显；整体式底板结构的水平位移明显小于分离式底板结构的水平位移；中墩的最大主拉应力相差很小,整体式底板的最大主拉应力大于分离式底板的最大主拉应力,整体式底板的最大主压应力也大于分离式底板的最大主压应力,由此可知,岩基上选用分离式底板较为经济合理。4、在地震荷载作用下闸室振动以前四阶振动为主。与顺河向地震作用相比,在横河向水平地震荷载作用下闸室产生较大的水平荷载和弯矩,引起较大的动位移以及超过允许应力的动应力,因而闸室结构承载力复核时应该采用横河向水平地震的动力反应结果。
[Abstract]:The sluice foundation is divided into soil foundation and rock foundation. Generally speaking, there are more studies on the sluice structure on the soil foundation, but the analysis of the sluice structure on the rock foundation still needs to be strengthened. Traditionally, the sluice structure is calculated separately. Although the method is simple, it does not take into account the interaction between the structures and sometimes deviates from the actual situation. The stress situation of the sluice in space structure is quite complex. The more reasonable method is to take the rock foundation and the sluice chamber structure as a whole and fully consider the interaction between the two. In this paper, a sluice on a rock foundation in Jiangsu Province is taken as the research object. The structure of the sluice chamber is analyzed and calculated by ABAQUS finite element software. The main contents of this paper are as follows: (1) the traditional method of sluice structure calculation is introduced, and the Winkel foundation beam method for calculation of bottom slab structure of sluice on rock foundation is emphatically expounded. At the same time, the finite element method of sluice structure calculation on rock foundation and the application of ABAQUS software in structural analysis of sluice are expounded. By analyzing the depth of rock foundation, the ratio of elastic modulus of rock foundation to elastic modulus of bottom plate, The influence of the thickness of the bottom plate and the thickness of the pier on the internal force of the bottom plate of the sluice, The following conclusions can be drawn: (1) Winkler's assumption (I. e., the method of bed coefficient) is feasible for the analysis of the internal force of the bottom plate of the sluice on the rock foundation) the larger the ratio of elastic modulus of rock foundation to the elastic modulus of the bottom plate is, the smaller the moment value of the mid-span bending of the bottom slab is, the greater the ratio of elastic modulus to the elastic modulus of the bottom plate is, The larger the foundation reaction force is in the middle of the bottom plate, but when the elastic modulus is similar, the greater the thickness of the bottom plate and the smaller the variation range of the foundation reaction force are, the more the foundation reaction force will increase, and the moment of bending in the middle span of the bottom plate will decrease. The greater the thickness of the pier, the smaller the moment in the middle span of the bottom slab, and the greater the foundation reaction. The change of ratio E/Ec and thickness of bottom plate has a great influence on the internal force of bottom plate of sluice on rock foundation. The finite element models of two kinds of sluice chamber structures, separated type and integral type, are established respectively. The results show that the settlement and uneven settlement of integral sluice structure are relatively small, but the settlement of integral bottom plate is not obvious compared with that of separate bottom plate. The horizontal displacement of the integral floor structure is obviously smaller than that of the split bottom structure, and the maximum principal tensile stress of the middle pier is very small, and the maximum principal tensile stress of the integral bottom plate is greater than the maximum main tensile stress of the split bottom plate. The maximum principal compressive stress of the integral bottom plate is also greater than that of the split bottom plate. It can be seen that it is more economical and reasonable to select the separated bottom plate on the rock foundation, and the fourth-order vibration of the gate chamber before the vibration of the sluice chamber under the action of earthquake load is dominant. Compared with the downstream seismic action, the horizontal load and bending moment of the sluice chamber under horizontal seismic load are larger, resulting in larger dynamic displacement and dynamic stress exceeding the allowable stress. Therefore, the dynamic response results of horizontal earthquakes should be used in checking the bearing capacity of sluice chamber structure.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV66

【参考文献】