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为了解决复杂几何边界条件下有限结构面的全空间块体识别问题,提出有向面单元的几何建模概念,并将网格划分思想引入块体理论中。首先利用空间正交网格将岩体离散为若干个小单元块体,然后依次添加结构面,对单元进行接触性判断及切割,最后去除网格合并单元,形成独立的空间块体。针对块体的切割,给出了平面对任意形态块体的切割方法。针对单元块体的合并,提出了以有向边合并为基础的块体合并方法,将同向面、异向面合并方法统一。研究表明该方法具有可动态添加有限结构面、建立复杂几何模型、识别块体的形态数量不受限制、编程简单等优点。结合辽宁某隧道工程实例,利用本研究成果识别出全空间内所有独立块体,并进一步提供围岩周围关键块体的基本信息,证明了其应用于复杂岩石块体识别的有效性和优越性,为确保岩体工程的安全生产提供技术支持。
In order to solve the problem of full space block identification of finite structure plane under complex geometric boundary conditions, the concept of geometrical modeling of directed plane element is proposed and the idea of meshing is introduced into the block theory. Firstly, the rock mass is discretely divided into several small unit blocks by using the space orthogonal grid, and then the structural planes are sequentially added to make contact judgment and cutting of the unit. Finally, the grid merge unit is removed to form an independent space block. For the cutting of the block, the cutting method of the plane to any form of block is given. Aiming at the merging of unit blocks, a block merging method based on directional edge merging is proposed. The merging methods of same direction and opposite direction are unified. The research shows that the proposed method has the advantages of dynamically adding finite structure surfaces, establishing complex geometric models, identifying unrestricted number of forms and simplifying programming. Combined with a tunnel project in Liaoning Province, this paper makes use of the results of this study to identify all the independent blocks in the whole space and further provide the basic information about the key blocks around the surrounding rock. It proves the validity and superiority of the block identification for complex rock blocks , In order to ensure the safety of rock mass production to provide technical support.