采用全空间块体搜索技术初步研究岩体完整性  

PRELIMINARY RESEARCH ON ROCKMASS INTEGRITY USING SPATIAL BLOCK IDENTIFICATION TECHNIQUE

作　　者：张奇华[1] 边智华[1] 余美万[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩石力学与工程学报》2009年第3期507-515,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金面上项目(50509003)

摘　　要：岩体完整性包括两方面含义:岩体切割程度和岩体块度。全面反映岩体完整性需要同时考虑结构面间距和长度,而不仅仅是间距。采用全空间块体搜索技术,可直观形象地对岩体切割程度及块度进行研究。结果表明,迹长间距比越大,岩体被切割程度越高,完整程度越低。当迹长间距比为3～4时,岩体被切割成较为离散的块体,对应于完整程度为较破碎即完整～破碎岩体的过渡阶段,结构类型为次块状。岩体块度不完全取决于结构面间距,还与切割程度有关,即要考虑到迹长间距比,当岩体被完全切割(迹长间距比大于3～4)时,块度才基本只受间距控制。这些结论可以作为岩体完整程度及岩体结构类型划分的补充条件。另外,以迹长服从对数正态分布为例,讨论不同迹长分布对所得结果的影响。最后,根据典型工程实例的结构面地质统计资料,分析岩体完整性及结构类型。研究途径和结论对于深入认识岩体完整性具有较大意义。Integrity of rockmass has two parts of meanings, i.e. rockmass cutoff degree and rockmass fragmentation degree. Discontinuity length and spacing should be considered both in describing rockmass integrity, rather than the latter only. Rockmass cutoff degree and rockmass fragmentation degree are studied using spatial block identification technique. The results show that the greater the ratio of trace length to spacing of discontinuity is, the higher the cutoff degree is and the lower the integrity is. When the ratio of trace length to spacing is 3 -4, the rockmass is divided into relatively discrete rockmass, which corresponds to comparative cracked one, i.e. the transition stage of complete to fractured rockmass, accordingly the rockmass structure type is inferior blocky. The rockmass fragmentation degree is not only dependent on discontinuity spacing, but also relevant to the ratio of trace length to spacing. When the rockmass is cut as block entirely, the fragmentation degree is controlled by spacing mainly. These conclusions can be used as supplementary conditions in classification of rockmass integrity and rockmass structure type. Furthermore, based on the conclusions drawn above, the influence of different distribution types of trace lengths with lognormal distribution is discussed. At last, the rockmass integrity and structure type of typical engineering are analyzed according to discontinuity statistic data. The research ways and the conclusions are of importance to further study of rockmass integrity.

关 键 词：岩石力学 岩体完整性 全空间块体搜索 岩体结构类型 迹长间距比 块度 

分 类 号：TU45[建筑科学—岩土工程]