楔形块体滑落试验及边坡楔形体的安全性评价

发布时间：2018-01-13 00:00

本文关键词：楔形块体滑落试验及边坡楔形体的安全性评价　出处：《东北大学》2014年硕士论文　论文类型：学位论文

【摘要】：楔形体的破坏是实际边坡工程中最常见的破坏方式之一,前人专注于对岩体的力学参数以及结构面的强度对潜在楔形块体破坏的研究,这种破坏是一种岩体之间应力的破坏,是产生楔形体的原因之一。结构面控制型的滑落失稳更强调结构面的空间位置及相互组成在对岩体的切割过程中所产生的块体的影响,本文着重研究两组优势结构面与临空面共同作用下产生的楔形块体空间位置之间的关系,简化内部含有岩桥以及结构面非连续贯通的情况,在假设块体已被切割的状态下,从几何的角度进行试验与分析,在对数据的处理分析后总结规律,提出基于几何关系与空间角度关系的安全性评价方法。此外,由于从几何与空间角度方面来研究楔形块体的滑落可能的文献较少,本文提出并研制了试验平台用已进行楔形块体空间几何方位方面的研究,利用团队研制的GeoSMA-3D系统,定义了坐标系中楔形块体的空间位置参数,进行对关键块体的判断,与提出的安全系数计算方法得出的结果比对。本文主要开展如下工作和研究内容：首先,总结了岩质边坡的稳定性分析方法,以及不同的节理岩体的质量评分体系；通过分析比较,关于平面破坏和倾倒破坏的空间角度修正参数较为全面,但在楔形块体评分体系中对空间角度的研究较少,通过相关文献的阅读,确定了SMR法中的权重最大的块体空间位置因素,提出了楔形块体空间角度的模型；其次,为建立楔形块体空间角度的模型,提出了变角度空间块体滑落模型试验平台的概念并建立了实物模型,制作加工了以花岗岩和砂浆材料为代表的楔形试块,开展了楔形试块的滑落试验取得了试块临界滑落状态下的两次角度。再次,应用灰色理论中的GM(1,1)模型优化了室内试验的数据并对其进行处理与规律性的总结,得出花岗岩楔形块体与砂浆楔形块体的对比曲线和方程,拟合出楔形块体旋转角、断面角与倾斜角之间的关系,提出一种基于空间角度的楔形体安全评价方法；最后,将上述内容应用GeoSMA-3D软件,定义了坐标系中楔形块体的旋转角、断面角,建立岩质边坡的空间模型,模拟添加三维结构面网络,通过对边坡临空面倾角的改变,应用空间角度的安全评价方法计算程序中得到的楔形块体安全系数,并与分析得出的关键块体作比对。
[Abstract]:Wedge failure is one of the most common failure modes in practical slope engineering. Previous studies focused on the mechanical parameters of rock mass and the strength of structural plane on the potential wedge block failure. This kind of failure is the failure of stress between rock masses. It is one of the reasons that the wedge-shaped body is produced. The sliding instability of the structural plane control type emphasizes the influence of the spatial position and the mutual composition of the structural plane on the block in the cutting process of the rock mass. This paper focuses on the study of the relationship between the spatial position of wedge-shaped blocks produced by the interaction of two groups of dominant structural planes and the adjacent surfaces, and simplifies the case of the internal rock bridges and discontinuous transfixion of the structural planes. Under the assumption that the block has been cut, the experiment and analysis are carried out from the point of view of geometry. After processing and analyzing the data, the law is summarized, and the method of safety evaluation based on geometric relationship and spatial angle relationship is put forward. Since there are few literatures on the possible sliding of wedge blocks from the angle of geometry and space, this paper presents and develops the research on the geometric orientation of wedge blocks in the experimental platform. Using the GeoSMA-3D system developed by the team, the spatial position parameters of wedge block in coordinate system are defined, and the key blocks are judged. The main work and research contents of this paper are as follows: firstly, the stability analysis method of rock slope is summarized. And different quality scoring system of jointed rock mass; Through analysis and comparison, the spatial angle correction parameters of plane damage and toppling damage are more comprehensive, but in the wedge block scoring system, there is less research on the spatial angle, through the reading of relevant literature. The spatial position factor of block with the largest weight in SMR method is determined, and the model of wedge block spatial angle is proposed. Secondly, in order to establish the model of wedge block spatial angle, the concept of variable angle space block sliding model test platform is put forward and the physical model is established. The wedge-shaped test blocks, represented by granite and mortar materials, were manufactured, and the sliding test of wedge-shaped test blocks obtained two angles under critical sliding state. Thirdly, the GM(1 in grey theory was applied. The results are as follows: 1) the model optimizes the data of laboratory test and summarizes its regularity. The contrast curves and equations between the granite wedge block and the mortar wedge block are obtained and the rotation angle of the wedge block is fitted. Based on the relationship between cross-section angle and inclined angle, a method of wedge safety evaluation based on spatial angle is proposed. Finally, using GeoSMA-3D software, the rotation angle and section angle of wedge block in coordinate system are defined, the spatial model of rock slope is established, and the three-dimensional structure plane network is simulated. Based on the change of slope slope slope inclination angle, the safety factor of wedge block is calculated by using the safety evaluation method of spatial angle, and compared with the key block obtained by analysis.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU45

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