边坡及洞室岩体的全空间块体拓扑搜索研究

 在一定空间区域内，由三维有限长的随机结构面及确定性结构面切割形成的所有块体的搜索问题，即全空间块体搜索问题，是裂隙岩体研究中十分重要的基础性课题。在随机结构面切割下全空间块体拓扑搜索一般方法研究基础上，进行边坡及洞室岩体的全空间块体搜索问题研究。给出计算分析过程，包括三维结构面网络模拟、结构面与边界面之间的交线分析、封闭回路分析、回路空间位置分析、孤立回路删除、相关回路分析以及封闭块体搜索等，并对其中的结构面与边界面交线求解进行重点讨论。对块体切割中出现的简单凸多面体及凹多面体、坑体、环体、腔体等4种块体类型进行分析，基于单连通和复连通回路的不同特点，讨论如何统一地对4种块体类型进行搜索分析，从而实现边坡/洞室岩体的全空间块体拓扑搜索技术。在此基础上，基于经典的块体理论，实现边坡/洞室工程中的块体渐进失稳分析技术。最后，针对边坡和洞室算例进行分析和讨论。

STUDY ON SPATIAL BLOCK TOPOLOGICAL IDENTIFICATION OF SLOPE AND CAVERN ROCK MASS

Within a certain domain of rock mass，identification of all blocks cut by three-dimensional finite random or fixed discontinuities is a critical basic problem in jointed rock mass researches. Based on general method of spatial block topological identification with stochastic discontinuities cutting，the block identification of slope and cavern rock mass is studied. The main analysis procedures are given，including 3D discontinuities network simulation，analysis of intersecting lines between discontinuities and surfaces，analysis of primary loops，loops location analysis，isolated loops deleting，relative loop analysis，and closed block identification. The process of solving intersecting lines between discontinuities and surfaces of slope/cavern is discussed emphatically. Four block types，i.e. simple convex and concave，pit，torus and cavity which may occur in rock mass with discontinuities cutting are analyzed. On the basis of the different characteristics of simply connected loops and multiple connected loops，how to identify the different block types uniformly is discussed. Therefore the technique of spatial block identification of slope/cavern is accomplished. Based on these，with classic block theory combined，the technique of block progressive failure analysis of slope/cavern is achieved. Finally，cases of slopes and caverns are studied.