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通过数字化量测方法,现场实测了建立结构面网络所需的参数,如迹长、空间三维坐标等。将获得的结构面空间三维坐标转化为二维坐标,采用离散单元方法定量地进行渗流分析,主要的工作包括:根据实测的结构面参数、迹长与隙宽的关系,确定不同裂隙的隙宽,从而建立结构面网络模型;计算了实测结构面中所选研究区域不同方向的等效渗透系数(5.4416×10~(-6)~9.7611×10~(-6)m/s),将获得的渗透系数绘制在极坐标系中,获得了岩体渗流的主渗透方向。根据渗透椭圆在三维空间中的分布,分析发现主渗透方向向左偏离正北方向约63°~78°,而另一等效渗透系数比较大的方向向左偏离正北方向约18°~33°,与实测露头面中两组夹角约为60°~70°优势裂隙组的方位一致,验证了采用实测结构面进行数值模拟的合理性。
Through the digital measurement method, the parameters needed to establish the structure plane network are measured in the field, such as the trace length and the space three-dimensional coordinates. The three-dimensional coordinates of the structural plane space are converted into two-dimensional coordinates, and the discrete element method is used to carry out the seepage analysis quantitatively. The main work includes: determining the gap width of different fractures according to the measured parameters of structural plane and the relationship between the trace length and the gap width , So as to establish the network model of structure plane. The equivalent permeability coefficients (5.4416 × 10 -6 ~ 9.7611 × 10 -6 m / s) in different directions of the selected study area are calculated, The permeability coefficient is plotted in the polar coordinate system and the main infiltration direction of rock mass seepage is obtained. According to the distribution of infiltration ellipse in the three-dimensional space, it is found that the main infiltration direction deviates to the left from the positive north direction by about 63 ° -78 °, while the direction with the larger equivalent permeability coefficient deviates leftward from the positive north direction by about 18 ° -33 ° °, which is in agreement with the azimuths of the predominantly fractured groups of about 60 ° ~ 70 ° in the two outcrops of the measured outcrops, which verifies the rationality of the numerical simulation using the measured structural planes.