{"title":"Effects of fracture system geometrical parameters on the inflow rate into a tunnel in rock: a numerical modeling experiment","authors":"A. Shahbazi, A. Saeidi, R. Chesnaux, A. Rouleau","doi":"10.1144/qjegh2021-128","DOIUrl":null,"url":null,"abstract":"Relationship between inflow rate to a rocky tunnel and the effective parameters controlling the inflow rate, e.g., aperture, spacing, orientation, tunnel radius, and water head is investigated by numerical modeling. Response surface methodology is adopted to optimize the number of simulations and their meaningful interpretation, and Design-Expert software is used for this purpose. Consequently, numerical simulations are performed using 3DEC version 7 software for 88 scenarios, based on different values of parameters related to fracture system geometry and boundary conditions. Accordingly, the relations between the inflow rate to the tunnel and the effective parameters as well as their interaction are determined and presented in the form of empirical equations. In addition, the mean value of each parameter is used to develop another equation for calculating the inflow rate. Specifically, the aperture and spacing, as well as the interaction between these parameters and other effective parameters, have the most important impacts on the value of the inflow rate. Furthermore, the impact of tunnel radius on the unit inflow rate is negligible. Using numerical simulations, two empirical equations have been developed for calculation of unit inflow rate to the tunnel: one for exact values of parameters and another for their mean values.\n \n Supplementary material: Supplementary information on the interaction between the parameters and the statistical analysis are available at\n https://doi.org/10.6084/m9.figshare.c.6292560\n","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" ","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Quarterly Journal of Engineering Geology and Hydrogeology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/qjegh2021-128","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Relationship between inflow rate to a rocky tunnel and the effective parameters controlling the inflow rate, e.g., aperture, spacing, orientation, tunnel radius, and water head is investigated by numerical modeling. Response surface methodology is adopted to optimize the number of simulations and their meaningful interpretation, and Design-Expert software is used for this purpose. Consequently, numerical simulations are performed using 3DEC version 7 software for 88 scenarios, based on different values of parameters related to fracture system geometry and boundary conditions. Accordingly, the relations between the inflow rate to the tunnel and the effective parameters as well as their interaction are determined and presented in the form of empirical equations. In addition, the mean value of each parameter is used to develop another equation for calculating the inflow rate. Specifically, the aperture and spacing, as well as the interaction between these parameters and other effective parameters, have the most important impacts on the value of the inflow rate. Furthermore, the impact of tunnel radius on the unit inflow rate is negligible. Using numerical simulations, two empirical equations have been developed for calculation of unit inflow rate to the tunnel: one for exact values of parameters and another for their mean values.
Supplementary material: Supplementary information on the interaction between the parameters and the statistical analysis are available at
https://doi.org/10.6084/m9.figshare.c.6292560
采用数值模拟的方法,研究了岩石隧洞入流速率与控制入流速率的有效参数(孔径、间距、方向、隧洞半径和水头)之间的关系。采用响应面法优化模拟次数及其有意义的解释,并使用Design-Expert软件实现这一目的。因此,基于与裂缝系统几何形状和边界条件相关的不同参数值,使用3DEC version 7软件对88种情况进行了数值模拟。据此,确定了隧道流入流量与有效参数之间的关系及其相互作用,并以经验方程的形式给出。此外,利用各参数的平均值建立了另一个计算流入速率的方程。其中,孔径和间距以及孔径和间距与其他有效参数的相互作用对入流速率的影响最为重要。此外,隧道半径对单位流入速率的影响可以忽略不计。通过数值模拟,建立了计算隧道单位流入流量的两个经验方程:一个是参数的精确值,另一个是参数的平均值。补充资料:有关参数与统计分析之间相互作用的补充信息,请访问https://doi.org/10.6084/m9.figshare.c.6292560
期刊介绍:
Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House.
Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards.
The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.