摘要
北山沙枣园是我国高放废物处置预选区的重点预选地段,该区域花岗岩体中广泛分布的露头节理是地下水渗流和核素迁移的通道。在前期露头调查测量基础上,以单一露头节理为对象,采用圆形窗口法计算节理的平均迹长L和单位面积数量P_(20)、采用拓扑理论计算单位节理的连接节点数C_(L)、采用盒子法计算露头节理的分形维数D;其次分析平面特征参数的线性相关性,其中C_(L)和L,D均呈正相关,系数为0.418,0.612,而P_(20)与L,D为负相关,系数为-0.538和-0.387,C_(L)与P_(20)没有体现相关性,提出露头节理的连通节点面密度参数P_(20C);然后以区域露头为对象,基于露头位置,采用Voronoi法剖分岩体,由面积加权法得区域平面特征参数值L=13.54 m,P_(20)=0.095个/m^(2),C_(L)=2.93,D=1.19,P 20C=0.25个/m^(2),运用四分位图呈现参数的区域分布,其中P_(20)区域分布聚集明显,区域“西南部大于东北部”;参数C_(L),L和D的区域分布相似,区域“中间小,周围相间”,最后采用参数P_(20C)和P_(20),C_(L)筛分岩体,岩体质量“好”的区域均位于调查区域的中部和东部。
Shazaoyuan granite masses is a key pre-selection area for high-level radioactive waste disposal in China.Outcrop joints widely distributed in the granite body are the channels for groundwater seepage and nuclide migration.On basis of previous outcrops survey and measurements,taking a single outcrop as an object,the circular window method was used to calculate the average trace length L and the number P_(20)of unit area of the outcrop;the topological theory was used to calculate the number C_(L)of connection nodes per unit joint,and the box counting method was used to calculate the fractal dimension D of the outcrop.Secondly,the linear correlation of plane characteristic parameters was analyzed,in which C_(L)is positively correlated with L and D,and the coefficients are 0.418 and 0.612,while P_(20)is negatively correlated with L and D,and the coefficients are-0.538 and-0.387.C_(L)and P_(20)do not reflect the correlation,and the area density parameter P of connected nodes of outcrop joints was proposed.Then,taking outcrops in the area as an object,based on location of outcrops,the Voronoi method was used to divide the rock mass.The regional plane characteristic parameter value L=13.54 m,P_(20)=0.095,C_(L)=2.93,D=1.19,P_(20C)=0.25 obtained by the area weighting method.Finally,the regional distribution of parameters is presented by the quartile map,in which the regional distribution of P_(20)is obvious,showing the characteristics that the southwest region is larger than the Northeast.The regional distribution of parameters C_(L),L and D is similar,showing that the area is small in the middle and alternated around.The rock mass was screened by parameters P_(20C),P_(20)and C_(L).The areas with“good”rock mass quality are located in the middle and east of the investigation area.
作者
霍亮
王贵宾
李亚伟
魏翔
刘桓兑
HUO Liang;WANG Guibin;LI Yawei;WEI Xiang;LIU Huandui(State Key Laboratory of Nuclear Resources and Environment,East China Institute of Technology,Nanchang,Jiangxi 330013,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;CNNC Key Laboratory on Geological Disposal for High-level Radioactive Waste,Beijing Research Institute of Uranium Geology,Beijing 100029,China;Chongqing Technology and Business University,Chongqing 400067,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2023年第S02期3931-3942,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(52008080,42272321)
关键词
岩石力学
高放废物
沙枣园
花岗岩
露头
拓扑
分形
rock mechanics
high-level radioactive waste
Shazaoyuan
granite
outcrop
topology
fractal
作者简介
霍亮(1988-),男,2016年于重庆大学矿业工程专业获博士学位,现任讲师,主要从事岩体力学方面的研究工作。E-mail:huoliang@126.com
