数字化结构面三维随机网络模拟及其有效性检验

SIMULATION OF RANDOM 3D DISCONTINUITIES NETWORK BASED ON DIGITALIZATION AND ITS VALIDATION TEST

岩体结构面网络模型的可靠度直接影响后续渗流计算结果的可信度。针对我国高放废物处置库甘肃北山预选区出露良好的花岗岩体,利用GPS,GIS等数字化测量分析技术展开岩体结构面精细调查,获取10 000余条结构面特征参数,经数字化统计、处理,建立三维随机网络模型,并对该模型开展图形与数值有效性检验。结果表明:相比传统方法,数字化测量处理手段改善了统计样本数量与精度不足的困局,较好地实现了区域岩体结构面精细调查,具备理想检验效果的随机模型更适用后期力学、渗流数值模拟计算。

The confidence level of seepage calculations in rock mass is directly influenced by the reliability of corresponding discontinuities network models. A detailed investigation on rock mass discontinuities was launched into the well outcropped granite body in Chinese high-level radioactive waste repository candidate site in Beishan of Gansu province using new digital techniques,such as GPS(global positioning system) and GIS(geographical information system). And the three-dimensional random discontinuities network model was established after the digital statistics processing of over 10 000 discontinuities acquired in the investigation. At last,the accuracy of the model was graphically and numerically validated. The results show that compared with the traditional method,the digital measurement processing means can overcome the insufficiency of statistical sample size and precision,and can complete the detailed investigation of regional rock mass discontinuities very well. And the random model with ideal test effect is more suitable for numerically simulated calculations of mechanical properties and seepage.