基于workbench的不对称拱坝稳定性静力分析
发布时间：2018-08-13 16:14
【摘要】：拱坝是三面固接于岩基上的超静定空间结构,其稳定性和安全性主要依赖于坝体应力的安全性以及坝肩的稳定性。目前,我国大部分的拱坝都是在上世纪建造完成,距今也有几十年的时间,现在很多拱坝已经进入老龄化并出现了病险情况,尤其小型拱坝出现的病险情况尤为严重。近年来随着病险拱坝数量的增多,现役拱坝的稳定性以及安全性越来越引起大家的广泛重视。本文利用有限元软件ANSYS workbench针对某小型水库不对称拱坝在正常蓄水位、设计洪水位以及校核洪水位三种工况下的稳定性和安全性进行了数值模拟,并对拱坝拱端推力对左端重力坝影响进行了分析,以确定该拱坝在稳定性和安全性方面是否存在安全隐患。与普通拱坝稳定性分析不同的是该拱坝的左、右两肩受力条件不对称,由于受不规则的“V”字形河谷断面的限制,拱坝的右端直接与岩体连接,左端与重力坝连接。左端重力坝除受到自身重力、上游水压力之外在坝体右侧还要受到拱端推力,这使其与普通的重力坝有所不同。经过对拱坝三种工况的模拟计算与分析,最终得出结果为:拱坝以及左端重力坝在三种工况下的最大变形只有9.5mm,属于小变形;拱坝的最大拉应力为1.3MPa,小于规范的容许值1.5 MPa,满足强度要求;最大压应力都小于混凝土的容许抗压值,满足强度的要求;拱坝坝肩以及重力坝安全系数最小值均在2.7以上,满足稳定性要求。数值模拟结果显示:该拱坝在使用多年后在强度方面、稳定性和安全性方面满足要求。
[Abstract]:Arch dam is a statically indeterminate space structure with three sides fixed on the rock foundation. Its stability and safety mainly depend on the security of dam body stress and the stability of dam abutment. At present, most of the arch dams in China were completed in the last century, and they have been built for several decades. Now many arch dams have been aging and have been in danger of illness, especially in the small arch dams. In recent years, with the increase of the number of dangerous arch dams, more and more attention has been paid to the stability and safety of active arch dams. In this paper, the finite element software ANSYS workbench is used to simulate the stability and safety of an asymmetric arch dam of a small reservoir under normal storage level, design flood water level and check flood water level. The influence of arch end thrust on the left end gravity dam is analyzed to determine whether the arch dam has a hidden safety hazard in terms of stability and safety. Different from the stability analysis of the common arch dam, the left and right shoulders of the arch dam are not symmetrical. Due to the limitation of the irregular "V" zigzag valley section, the right end of the arch dam is directly connected with the rock mass, and the left end is connected with the gravity dam. The gravity dam at the left end is not only subject to its own gravity, but also to the right side of the dam body in the upstream water pressure, which makes it different from the ordinary gravity dam. Through the simulation calculation and analysis of three working conditions of arch dam, the results are as follows: the maximum deformation of arch dam and left end gravity dam is only 9.5 mm, which belongs to small deformation; The maximum tensile stress of arch dam is 1.3 MPA, which is less than the allowable value of the code (1.5 MPA), which satisfies the strength requirement, the maximum compressive stress is less than the allowable compressive value of concrete and meets the requirement of strength, the minimum value of safety factor of arch dam abutment and gravity dam is above 2.7, Meet the stability requirements. The numerical simulation results show that the stability and safety of the arch dam meet the requirements of strength, stability and safety after many years of operation.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV642.4
本文编号：2181510
[Abstract]:Arch dam is a statically indeterminate space structure with three sides fixed on the rock foundation. Its stability and safety mainly depend on the security of dam body stress and the stability of dam abutment. At present, most of the arch dams in China were completed in the last century, and they have been built for several decades. Now many arch dams have been aging and have been in danger of illness, especially in the small arch dams. In recent years, with the increase of the number of dangerous arch dams, more and more attention has been paid to the stability and safety of active arch dams. In this paper, the finite element software ANSYS workbench is used to simulate the stability and safety of an asymmetric arch dam of a small reservoir under normal storage level, design flood water level and check flood water level. The influence of arch end thrust on the left end gravity dam is analyzed to determine whether the arch dam has a hidden safety hazard in terms of stability and safety. Different from the stability analysis of the common arch dam, the left and right shoulders of the arch dam are not symmetrical. Due to the limitation of the irregular "V" zigzag valley section, the right end of the arch dam is directly connected with the rock mass, and the left end is connected with the gravity dam. The gravity dam at the left end is not only subject to its own gravity, but also to the right side of the dam body in the upstream water pressure, which makes it different from the ordinary gravity dam. Through the simulation calculation and analysis of three working conditions of arch dam, the results are as follows: the maximum deformation of arch dam and left end gravity dam is only 9.5 mm, which belongs to small deformation; The maximum tensile stress of arch dam is 1.3 MPA, which is less than the allowable value of the code (1.5 MPA), which satisfies the strength requirement, the maximum compressive stress is less than the allowable compressive value of concrete and meets the requirement of strength, the minimum value of safety factor of arch dam abutment and gravity dam is above 2.7, Meet the stability requirements. The numerical simulation results show that the stability and safety of the arch dam meet the requirements of strength, stability and safety after many years of operation.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV642.4
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