含非贯通裂隙的三维岩体拓扑识别的切割算法

岩体中的裂隙是影响其物理力学性质的关键因素,对裂隙岩体进行拓扑识别,是各种不连续数值分析方法的基础.由于裂隙随机分布且数量巨大,使得裂隙岩体中的块体形状复杂、块体搜索难度很大.考虑裂隙分布的随机性及块体中的非贯通裂隙,提出了三维裂隙岩体拓扑识别的切割算法.首先,生成初始块体,并根据裂隙的统计数据随机生成其几何信息.然后,逐条加入裂隙面,通过其与已有块体的线段、多边形面的相对位置关系,进行拓扑计算,实现其对已有块体的切割,从而生成新的块体信息.最后,通过算例分析,对所提的切割算法的效率进行了验证.该方法能够快速、有效地实现三维裂隙岩体的拓扑识别,且能记录块体内部的非贯通裂隙,可以作为裂隙岩体非饱和渗流分析及裂隙扩展过程模拟分析的基础.

Cutting algorithm for topology identification of three-dimensional rock mass containing discontinuous fissures

The fissure in rock is a critical factor affecting its physico-mechanical property.Because of fissure’s random distribution,the shape of rocks is very complicated and it is very difficult to search for rocks.Considering that the distribution of fissures is random and there are discontinuous fissures,a cutting algorithm for topology identification of three-dimensional fissure rock mass is proposed.Firstly,an initial block is generated;and the geometry information of fissures is generated according to its statistical data randomly;then interject fissure-plane is added one by one.Through the relative location relation of fissure-plane and original lines and plane polygons,the topology calculation is made to bring about cutting original blocks,then the new block information is generated.Lastly,the efficiency of cutting algorithm advanced is verified.This algorithm can complete topology identification of three-dimensional fissure rock mass quickly and effectively,and record discontinuous fissures in rocks.The results can act as base for unsaturated seepage analysis of fissure rock and simulation analysis of extended procedure of fissures.