复杂地质条件下混凝土重力坝动力稳定性研究

发布时间：2018-05-03 12:53

本文选题：动力抗滑稳定 + 双系数强度折减　；参考：《大连理工大学》2014年硕士论文

【摘要】：随着我国经济的快速发展,传统能源的紧缺问题逐渐引起人们的重视,大力发展清洁能源,寻求替代能源成为新世纪我们解决能源问题的首要途径。水电能源是清洁的可再生能源,是国家工业发展和人们日常生活必不可少的重要因素,水利发电科学技术的发展一直受到世界各界的高度重视。混凝土重力坝是我国水利工程建筑物的重要坝型之一,在我国的西南、西北地区大量修建。而西南山区的地质条件复杂势必给我们的水电开发事业带来巨大的挑战。根据水电中长期开发规划,未来我国大中型水电开发的重心已经转移向高海拔,低气温的寒冷地区,这些地区地质构造背景复杂,地震地质灾害频发,给高坝的抗震设计和安全运行带来的巨大的挑战。大坝的抗滑稳定分析对大坝的抗震安全评价至关重要。本文针对重力坝地基的复杂性,考虑裂隙岩体的分布特性,分析和研究大坝地基塑形滑动区域的发展,推测出大坝的潜在滑移通道,研究其在动力作用下的稳定性。针对复杂基岩的强度参数的不确定性及对重力坝安全性的重大影响,采用双系数强度折减法研究了Mohr-Coulomb准则中基岩强度参数粘聚力和内摩擦角对重力坝基岩稳定性的影响,并探讨了不同判别指标下基岩强度参数的取值范围,绘制出不同情况下材料强度参数的二维取值区域。针对节理岩体的各向异性特性和不确定性及其对岩石强度参数的影响,从理论的角度分析了节理岩体各向异性的强度特征,指出单纯从理论方面研究的不足及存在的问题,进而提出通过建立节理岩体的数值模型,应用显式有限差分程序(FLAC3D)的数值模拟试验方法研究了节理岩体强度的各向异性特征。针对复杂基岩地基的本构关系对混凝土重力坝的抗滑稳定的影响,考虑节理裂隙岩体的分布走向,采用了ubiquitous-joint模型和强度折减法相结合的形式来分析节理岩体地基的破坏形式,坝顶的最大位移,不同节理倾角对安全系数的影响。
[Abstract]:With the rapid development of economy in our country, the shortage of traditional energy has been paid more and more attention. To develop clean energy and find alternative energy has become the first way to solve the energy problem in the new century. Hydropower energy is a clean and renewable energy, which is an indispensable factor for the development of national industry and people's daily life. The development of hydropower science and technology has been attached great importance to by all walks of life all over the world. Concrete gravity dam is one of the most important dam types in water conservancy engineering in China. The complex geological conditions in southwest mountainous area will bring great challenges to our hydropower development. According to the medium- and long-term hydropower development plan, in the future, the center of gravity of large and medium-sized hydropower development in China has shifted to cold areas with high altitude and low temperature. These areas have complex geological tectonic backgrounds and frequent seismic geological disasters. It brings great challenge to seismic design and safe operation of high dam. The stability analysis of the dam is very important to the seismic safety evaluation of the dam. In view of the complexity of gravity dam foundation, considering the distribution characteristics of fractured rock mass, this paper analyzes and studies the development of plastic sliding zone of dam foundation, infer the potential slip channel of dam and study its stability under dynamic action. In view of the uncertainty of strength parameters of complex bedrock and its great influence on the safety of gravity dam, the influence of cohesion force and angle of internal friction of bedrock strength parameters on the stability of gravity dam bedrock in Mohr-Coulomb criterion is studied by double coefficient strength reduction method. At the same time, the range of strength parameters of bedrock under different discriminant indexes is discussed, and the two-dimensional value regions of strength parameters of materials under different conditions are plotted. In view of the anisotropic characteristics and uncertainty of jointed rock mass and its influence on rock strength parameters, this paper analyzes the anisotropic strength characteristics of jointed rock mass from a theoretical point of view, and points out the shortcomings and problems in theoretical research. Furthermore, by establishing a numerical model of jointed rock mass and using the explicit finite difference program FLAC3D, the anisotropic characteristics of the strength of jointed rock mass are studied by using the numerical simulation test method. In view of the influence of constitutive relation of complex bedrock foundation on the stability of concrete gravity dam, considering the distribution trend of jointed fractured rock mass, the failure mode of jointed rock mass foundation is analyzed by combining ubiquitous-joint model and strength reduction method. The maximum displacement of the dam top and the influence of different joint inclination angle on the safety factor.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV642.3;TV312

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