大数量非贯通节理岩体离散元数值模拟实现方法研究

Realization method of discrete element numerical simulation of large number of non-persistent jointed rock mass

为了研究大数量非贯通节理岩体的力学行为,以3DEC离散元软件为平台,提出适用于数值模拟的连通率定量计算的具体方法,其大小等于非贯通节理面积与切割贯通节理面积的比值。其中,非贯通节理面积可由三维岩体结构面网络模拟技术获取的薄圆盘直径,通过面积计算而得,而贯通节理面积与切割岩体形状密切相关,可分为规则岩体与非规则岩体两种情况。规则岩体由联立方程组进行求解,非规则岩体可根据本文提出的点数据搜索法进行获取。采用案例分析对计算结果进行对比验证,结果显示:所提方法能够实现大数量非贯通节理岩体力学行为的离散元数值模拟研究,采用的点数据搜索方法能够解决规则和非规则岩体切割截面面积求解难题,提高数值模拟效率,并且取得了较为可靠的模拟结果。

To understand mechanical behaviors of joint rock with large number of non-persistent discontinuities,a new calculation of the connectivity,defined as the radio of non-persistent joint area to apparent persistent joint area,is presented based on the 3DEC discrete element software.The non-persistent joint area can be evaluated according to 3D discontinuities network through calculation of thin disk area.The apparent persistent joint area is closely related to the geometry of cutting rock mass which can be subdivided into regular and irregular shape.In the case of regular rock mass,the apparent persistent joint area is computed by simultaneous equations.For irregular rock mass,the area can be obtained using points searching approach.The proposed method is validatedby two examples,and the results show that the study can achieve the numerical simulation of the mechanical behavior with respect to larger number of non-persistent jointed rock mass,and points searching approach can solve the areas of cross sections in both regular and irregular shaped rock mass efficiently.Additionally,simulation results are reliable which have good agreements with reality in two examples.