网格精度与对称性对深部岩体分区破裂化的影响  

Effects of Grid Accuracy and Symmetry on Zonal Fracture of Deep Rock Mass

作　　者：孙宽 陈如意 胡新伟 SUN Kuan;CHEN Ruyi;HU Xinwei(School of Civil and Surveying Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《河南科技》2024年第20期61-65,共5页Henan Science and Technology

摘　　要：【目的】深部岩体工程开挖卸荷后,围岩普遍存在分区破裂化现象,容易导致隧洞大变形、大范围塌方、涌水等工程事故,利用数值模拟软件可以较好地重现该现象,但数值模拟网格质量会对模拟结果产生较大影响,为保证模拟结果的相对可靠,有必要对其进行研究分析。【方法】基于深部岩体应变软化模型,建立深埋多隧洞数值模型,研究网格对称性与网格精度对围岩分区破裂形态、破裂带数目、破裂范围的影响。【结果】结果表明,网格的对称性和精度会对围岩分区破裂化模拟结果产生较大影响,非对称网格及粗糙网格会使分区破裂数值模拟结果产生较大误差。【结论】网格划分过程中要注意网格的对称性以及单元尺寸的选取,本研究对类似研究具有一定的参考价值。[Purposes]After excavation and unloading of deep rock mass engineering,there is a common phenomenon of zonal fracture in the surrounding rock,which can easily lead to engineering accidents such as large deformation of the tunnel,large-scale collapse,and water inflow.The use of numerical simulation software can better reproduce this phenomenon,but numerical simulation mesh quality will have a greater impact on simulation results.In order to ensure the relative reliability of the simulation re-sults,it is necessary to study and analyze the numerical simulation mesh quality.[Methods]A numerical model of deeply buried multi-tunnels was established based on the strain softening model to study the ef-fects of grid symmetry and grid accuracy on the zonal fracture morphology,number and range of sur-rounding rock fracture zones.[Findings]The results show that the symmetry and accuracy of the grid will have a great impact on the simulation results of zonal fracture of the surrounding rock.Asymmetric grids and rough grids will cause large errors in the numerical simulation results of zonal fracture.[Con-clusions]Therefore,attention should be paid to the symmetry of the mesh and the selection of the unit size during the meshing process.This study has certain reference value for subsequent scholars to study this phenomenon through numerical simulation.

关 键 词：深部岩体 应变软化 围岩分区破裂化 网格对称性 网格精度 

分 类 号：TU45[建筑科学—岩土工程]