基于优化克里金插值方法的隧道主结构面建模

Modeling of main discontinuities of rock tunnel based on optimized Kriging interpolation method

在围岩地质条件复杂的隧道施工过程中,对隧道开挖面前方地质体的描述是安全设计施工的关键。隧道主结构面的展布形态是围岩物理力学性质以及围岩稳定性的控制性因素之一。采用几何概率方法对隧道主结构面在三维空间内的产状和尺寸进行估计,并确定地质钻孔相关孔位参数,以准确获取用于插值的地质数据库。利用蚁群优化算法在离散数据中快速找到“巢穴”到“食物”之间最优路线的独特优势,将其应用于隧道主结构面建模中克里金插值方法的变异函数模型选择和参数优化,以克服其主观性和不确定性。通过结构面方差模型和结构面粗糙度系数的计算分析,验证优化克里金插值方法在隧道主结构面建模方面的有效性,实现较高的插值精度,可以应用于后续的三维复杂地质建模。

The description of the geological body in front of the tunnel excavation face is the key to safe design and construction in the process of tunnel construction with complex surrounding rock geological conditions.The distribution form of the main discontinuity of the tunnel is one of the controlling factors of the physical and mechanical properties of the surrounding rock and the stability of the surrounding rock.The geometric probabilistic method is used to estimate the orientation and size of the main discontinuity of the tunnel in three-dimensional space,and to determine the relevant hole location parameters of geological boreholes,so as to accurately obtain the geological database for interpolation.Taking advantage of the unique advantages of ant colony optimization algorithm to quickly find the optimal route from“nest”to“food”in discrete data,it is applied to the selection of variogram model and parameter optimization of Kriging interpolation method in tunnel main discontinuity modeling to overcome its subjectivity and uncertainty.Through the calculation and analysis of the structural plane variance model and joint roughness coefficient,the effectiveness of the optimized Kriging interpolation method in the modeling of the main discontinuity of the tunnel is verified,and the high interpolation accuracy is achieved,which can be applied to the subsequent three-dimensional complex geological modeling.