依据随机加权法,实现了岩体单元模型中每个单元体的力学参数非均质化。以含结构面的非均质化岩体单元为研究对象,通过对结构面倾角、结构面长度(迹长)、结构面宽度、结构面端部间距和岩桥倾角等五个参数进行分析,并进行正交试验,拟合得出静载作用下结构面岩体的岩桥贯通系数公式,修正了现有的贯通系数。利用自主开发的岩体工程结构与模型分析系统(GeoSMA-3D),结合上述理论,对某隧道进行关键块体的空间位置搜索及工程稳定性分析。
Based on the random weighted method, the mechanical parameter heterogeneity of each units of the rock mass unit model is achieved. To study the heterogeneous rock mass unit model, the rock bridge transfixion mechanism is analyzed in terms of five main factors: dip angle, rock bridge angle, length, width and end spacing of cracks. Then, a rock bridge transfixion coefficient formula of the surface rock mass under static load is proposed by orthogonal experiment and data fitting, while the existing transfixion coefficient is modified. By adopting the theory proposed above, identification of spatial location of the key block and stability analysis are made using the GeoSMA-3D system in a tunneling project.