基于三维裂隙网络RQD的确定及最佳测线数量的研究  

Determination of RQD and number of optimum scanlines based on three-dimensional fracture network

作　　者：张文[1] 陈剑平[1] 牛岑岑[1] 鲍硕超[1] 许德智[1] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026

出　　处：《岩土工程学报》2013年第2期321-327,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(40872170;41072196);高校博士学科点专项科研基金项目(20090061110054);吉林大学"985"计划项目(450070021107);吉林大学创新基金项目(20121073)

摘　　要：作为评价岩体质量好坏的重要指标,RQD的应用已十分广泛,其在工程地质与岩土工程的分析中发挥着重要的作用。而通过钻孔的方法进行RQD的获取具有明显缺点。真实岩体不同方向的RQD并不一致,而以垂直于地表的钻孔获取的RQD并不能完全代表整体岩体的好坏程度。引入三维裂隙网络的方法进行RQD的计算,在三维裂隙网络内设立测线,以测线的形式来模拟钻孔,获取指定方向的RQD值。岩体不同于其他人工材料,其具有明显的非均质性,即在不同位置获取的RQD值并不一致,现今RQD的研究则鲜有考虑。对岩体内的最佳测线数量进行了研究。结果表明:当沿x,y与z轴分别存在25,80与55条测线时,可获取岩体各方向的真实RQD值,且最大限度的节省计算时间以实施进一步的研究。RQD, as an important parameter to reflect the rock mass quality, has been applied universally and played an important role in geological engineering and geotechnical engineering. There is an apparent defect for obtaining RQD values through drills. The RQD values vary in different directions. RQD through drills whose direction is perpendicular to the ground can not represent that in the rock mass. In this paper, the three-dimensional fracture network simulation is employed to calculate RQD. Scanlines, represented by the actual drill, are set in the rock mass, and RQD in different directions can be obtained. The rock masses are different from other materials, and the RQD values are different considering different points in the study rock mass. It is not considered in the former studies. The number of the optimum scanlines is studied. The results show that when the scanlines in x, y and z directions are 25, 80 and 55, the RQD values are real and the computing time is the minimum.

关 键 词：RQD 岩体 阈值 各向异性 非均质性 

分 类 号：TU642.5[建筑科学—建筑技术科学]