隧洞涌水量数值模拟不同网格加密方法对比研究  

Comparison of different grid densification methods for numerical simulation of tunnel water inflow

作　　者：张立民 田峥颖 崔子腾 ZHANG Limin;TIAN Zhengying;CUI Ziteng(Changyi Management Station of Shandong Water Transfer Project Operation and Maintenance Center,Changyi 261300,Shandong,China;School of Earth Science and engineering,Hohai University,Nanjing 211100,Jiangsu,China;Qingdao Zhongyu Environmental Testing Co.,Ltd.,Qingdao 266000,Shandong,China)

机构地区：[1]山东省调水工程运行维护中心昌邑管理站,山东昌邑261300 [2]河海大学地球科学与工程学院,江苏南京211100 [3]青岛中禹环境检测有限公司,山东青岛266000

出　　处：《水利水电技术（中英文）》2023年第S01期110-117,共8页Water Resources and Hydropower Engineering

基　　金：山东省调水工程运行维护中心科技项目“引黄济青调水工程典型区段地下水生态环境演变规律及其影响关键技术”(2019001)。

摘　　要：突水突泥事故是隧洞工程施工过程中常见地质灾害之一,因此在施工前期对于隧洞涌水量的预测和计算工作尤为重要。由于数值模拟计算法中存在关键参数选取的科学依据不足、不同网格加密方案的计算效果难以评估等问题,首先建立三维地下水稳定流模型,确定Drain模块中排水系数C的取值,再采用粗网格、细网格、Quadtree和Nested grid四种不同的网格加密方法进行隧洞涌水量数值模拟计算,分析评价各方案的优劣及其适用性。结果表明:(1)涌水量Q随C值快速增大后趋于稳定,说明C值在一定范围内影响Q的计算结果;(2)细网格、Quadtree以及Nested grid模型,比粗网格模型模拟精度高,更能准确地刻画因隧洞开挖导致的地下水位变化情况;(3)和细网格模型相比,两种非结构化网格模型的网格总数较少,模型运行时间短,在没有大幅度降低模拟精度的前提下,运行效率更高,且Quadtree网格具有逐级渐变加密的优势。The accidents of water inrush and mud inrush are common geological hazards in tunnel construction,so it is very important for the prediction and calculation of tunnel water inflow in the early stage of construction.Due to the lack of scientific basis for the selection of key parameters in the numerical simulation calculation method and the difficulty in evaluating the calculation effect of different grid densification schemes,this paper first establishes a three-dimensional groundwater steady flow model to determine the value of drainage coefficient(Conductance-C)in drain module,and then uses four different grid densification method:coarse grid,fine grid,quadtree and nested grid to simulate the water inflow of tunnel,Analyze and evaluate the advantages and disadvantages of different grid encryption schemes and their applicability.The result show that:1)Water inflow(Q)tends to be stable with the rapid increase of C value,indicating that C value affects the calculation result of Q within a certain range;2)Fine-grid model and Quadtree and Nested Grid model have higher simulation accuracy than coarse Grid model and can describe the groundwater level change caused by tunnel excavation more accurately;3)Compared with the fine-grid model,the Quadtree model has fewer grids and shorter running time than the Nested Grid model.Under the premise of not greatly reducing the simulation accuracy,the running efficiency is higher,and the Quadtree Grid has the advantage of progressively encrypted.

关 键 词：网格加密 隧洞涌水量计算 突水突泥灾害 嵌套网格 四叉树网格 

分 类 号：P641[天文地球—地质矿产勘探]