洞顶岩石断裂破坏与颗粒流模拟分析

针对卡其娜洞顶发生的岩石崩落问题,选取其中Throne Room为例,对岩石基本力学性质和断裂韧度进行测试,之后建立三维颗粒流模型并对其进行分析。利用三维激光扫描仪完整再现洞顶几何形态,通过Rhinoceros 3D处理点云数据用于PFC模型构建;利用岩体特征分析软件Split-FX从三维扫描点云中获取不连续面的位置、方向和大小,在模型相应位置建立不连续面网。采用平节理(flat-joint)接触模型更好地模拟Kartchner石灰岩的脆性特质,不连续面采用光滑节理(smooth-joint)接触模型模拟。对三维颗粒流软件PFC3D应用于大型岩土体工程分析具有一定的借鉴意义。

Analysis of cave roof rock fracture failure and discrete element simulation

Throne room was picked as a case to study the rock breakdown problem at Kartchner Caverns. Traditional rock property tests and three fracture toughness tests were conducted for further numerical modelling. The three dimensional particle flow code was used to construct the whole model. After the LIDAR scanning of the cave geometry, Rhinoceros 3Dwas used to deal with the point clouds for modelling construction. Fracture characters like location, direction and magnitude were attended from the Split-FX for the discrete fracture network construction. The flat-joint contact model was used to better simulate the brittle limestone, and smooth-joint contact model was adopted for the fracture modelling. The paper has a referential value for large project modelling by three dimensional particle flow code.