隧洞入口非凸关键块体识别研究

发布时间：2018-03-13 05:11

本文选题：隧洞入口　切入点：非凸块体　出处：《地下空间与工程学报》2017年03期 　论文类型：期刊论文

【摘要】：隧洞入口处往往是地下岩体工程事故的多发区,也可能存在同时跨隧洞顶板、侧壁和入口边坡面的非凸关键块体,经典块体理论中的凸块体有限性判定定理不适用于非凸块体。在经典块体理论的基础上,笔者针对临空面之间含有凹状组合时需要进行并集运算的特征,提出了可以同时表示凸块体和非凸块体的一般符号表示方法,然后根据一般块体的构造定理,推出了用所有子块体是否有限来判断非凸块体有限与否的识别准则,进而枚举分析出系统中的所有有限凸块体,并按照结构面编码相同的原则组合出所有可能的有限非凸块体,同时沿着凹状相交的临空面逐次切割非凸块体,可以得到仅在切割面处相连接的非凸块体的子块体最优组合,从而可以实现隧洞入口处非凸关键块体的识别。这个方法的理论意义在于从凸块体到非凸块体扩展了块体理论的应用范围,在实际工程中又具有一定的实用价值。
[Abstract]:The entrance of the tunnel is often the frequently occurring area of underground rock engineering accidents, and there may also be non-convex key blocks that span the roof, side wall and entrance slope of the tunnel at the same time. The finiteness theorem of convex block in classical block theory is not suitable for non-convex block. On the basis of classical block theory, the author aims at the characteristic of union operation when there is concave combination between empty surfaces. A general symbolic representation method which can represent both convex and non-convex blocks is proposed. Then, according to the construction theorem of general blocks, the recognition criteria of whether all subblocks are finite to judge the finite or not of non-convex blocks are derived. Then all finite convex blocks in the system are enumerated and analyzed, and all possible finite non-convex blocks are combined according to the same principle of structural surface coding. At the same time, the non-convex blocks are cut one by one along the concave interface. The optimal combination of sub-blocks of non-convex blocks connected only at the cutting surface can be obtained. The theoretical significance of this method is that the application range of block theory is extended from convex block to non-convex block, and it has certain practical value in practical engineering.
【作者单位】：华北水利水电大学资源与环境学院;
【基金】：华北水利水电大学高层次人才科研启动项目(40274) 国家自然科学基金(41402269,51409102)
【分类号】：U451.2

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