Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Development of a numerical model for grout injection and its application to the in situ grouting test at the Grimsel test site, Switzerland
Grouting is commonly used to decrease the hydraulic conductivity of fractured rock masses and control the groundwater inflow. Since underground facilities are constructed in various geological conditions, different types of grout material and mixing/injection methods have been developed for effective and economical grout injection. It is also important to evaluate the grout arrival distance and the range of the altered hydraulic conductivity field after grout injection. However, the mechanism of the grout injection process has not yet been clarified sufficiently due to complex chemical and physical processes during grout injection. In this study, to simulate the grout injection process, a three-dimensional numerical model based on an equivalent continuum approach was developed and applied to the in situ grout injection tests at the Grimsel test site, Switzerland. In the simulations, the injection pressure and/or the injection rate was given as a boundary condition and the total amount of injected grout (silica sol) was calculated. The breakthrough curves (grout arrival time and the time evolution of grout density) at the observation boreholes and the distribution of the altered hydraulic conductivity field were also investigated. The simulation results were also compared with the ones obtained from in situ measurements/monitoring, which showed qualitatively good agreement.
Development of a numerical model for grout injection and its application to the in situ grouting test at the Grimsel test site, Switzerland
Grouting is commonly used to decrease the hydraulic conductivity of fractured rock masses and control the groundwater inflow. Since underground facilities are constructed in various geological conditions, different types of grout material and mixing/injection methods have been developed for effective and economical grout injection. It is also important to evaluate the grout arrival distance and the range of the altered hydraulic conductivity field after grout injection. However, the mechanism of the grout injection process has not yet been clarified sufficiently due to complex chemical and physical processes during grout injection. In this study, to simulate the grout injection process, a three-dimensional numerical model based on an equivalent continuum approach was developed and applied to the in situ grout injection tests at the Grimsel test site, Switzerland. In the simulations, the injection pressure and/or the injection rate was given as a boundary condition and the total amount of injected grout (silica sol) was calculated. The breakthrough curves (grout arrival time and the time evolution of grout density) at the observation boreholes and the distribution of the altered hydraulic conductivity field were also investigated. The simulation results were also compared with the ones obtained from in situ measurements/monitoring, which showed qualitatively good agreement.
Development of a numerical model for grout injection and its application to the in situ grouting test at the Grimsel test site, Switzerland
Koyama, Tomofumi (Autor:in) / Katayama, Tatsuo (Autor:in) / Tanaka, Tatsuya (Autor:in) / Kuzuha, Yuji (Autor:in) / Ohnishi, Yuzo (Autor:in)
Geosystem Engineering ; 16 ; 26-36
01.03.2013
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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