中文摘要：

岩体表征单元体（REV）的研究一直是岩土工程中的重要问题。裂隙岩体REV是其内部复杂结构在尺寸效应上的体现，归因于岩体内裂隙系统的随机性。在三维网络模型的基础上通过计算体积节理数建立了确定岩体REV的方法。这种方法考虑了岩体内裂隙的三维空间密度的特征，采用体积节理数这一参数的收敛状况确定岩体REV的大小。建立了实际岩体的模拟裂隙系统，用一定大小的立方体来分割裂隙系统，统计不同立方体内的体积节理数，并将均值作为最终裂隙岩体的参数。将此参数作为裂隙岩体的属性，通过判别其收敛状况获得了岩体REV的尺寸。考虑了岩体不连续面的特征，建立了REV的分析模型，得出工程岩体的REV的尺寸是裂隙平均迹长的4倍的结论。

英文摘要：

The study on representative element volume （REV） attracts attentions in geotechnical engineering. The inherent complexity （stochastically distributed fracture network） highly attributes to the existence of REV. A new method, which comprehensively considers the fracture features of the rock masses, is built based on 3D fracture numerical network modeling. Subsequently, volumetric joint count calculation is applied to determine the REV size. 3D fracture numerical network is modeled; and the network is divided by cubes with augmented sizes. The cubes are numbered, and the fracture parameter central point number is confirmed. On the assumption that the parameter is an attribute of the rock masses, the volumetric joint count can be confirmed; and the mean value can be applied to determine the RVE size based on the convergence state. This paper comprehensively considers the fracture features of the rock masses; and the REV model is built based on volumetric joint count determination. A conclusion is drawn that REV size is 4 times larger than the average trace length.