北山沙枣园花岗岩岩体露头节理的平面特征研究

doi:10.13722/j.cnki.jrme.2022.0893

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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、采用拓扑理论计算单位节理的连接节点数、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，其中和L，D均呈正相关，系数为0.418，0.612，而与L，D为负相关，系数为－0.538和－0.387，与没有体现相关性，提出露头节理的连通节点面密度参数；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 = 13.54 m， = 0.095 个/m2， = 2.93， = 1.19， = 0.25 个/m2，运用四分位图呈现参数的区域分布，其中区域分布聚集明显，区域“西南部大于东北部”；参数，L和D的区域分布相似，区域“中间小，周围相间”，最后采用参数和，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。

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	霍亮1
	王贵宾2
	李亚伟3
	魏翔4
	刘桓兑2

关键词 ：岩石力学, 高放废物, 沙枣园, 花岗岩, 露头, 拓扑, 分形

Abstract：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 of unit area of the outcrop；the topological theory was used to calculate the number 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 is positively correlated with L and D，and the coefficients are 0.418 and 0.612，while is negatively correlated with L and D，and the coefficients are －0.538 and －0.387. and do not reflect the correlation，and the area density parameter 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 = 13.54 m， = 0.095， = 2.93， = 1.19， = 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 is obvious，showing the characteristics that the southwest region is larger than the Northeast. The regional distribution of parameters ，L and D is similar，showing that the area is small in the middle and alternated around. The rock mass was screened by parameters ， and . The areas with“good”rock mass quality are located in the middle and east of the investigation area.

Key words： rock mechanics high-level radioactive waste Shazaoyuan granite outcrop topology fractal

引用本文:

霍亮1，王贵宾2，李亚伟3，魏翔4，刘桓兑2. 北山沙枣园花岗岩岩体露头节理的平面特征研究[J]. 岩石力学与工程学报, 2023, 42(S2): 3931-3942.
HUO Liang1，WANG Guibin2，LI Yawei3，WEI Xiang4，LIU Huandui2. Planar characteristics of outcrop joints of Shazaoyuan granite masses in Beishan. , 2023, 42(S2): 3931-3942.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0893 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/3931

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