Alternative Title
Paper No. 2.18
Location
St. Louis, Missouri
Date
10 Mar 1998, 2:30 pm - 5:30 pm
Abstract
Grouting is a principal technique to improve watertightness of the foundation of dams. But it is not easy to predict the amount of grouting work until attaining the required improvement of watertightness of rock mass, since the improvement mechanism of watertightness by grouting is not understood comprehensively. Therefore, the grouting work is conducted with the split spacing method until attaining the required improvement. In this paper, the method to predict the effects of grouting is discussed analyzing grouting data obtained from the Hattabara Dam construction site. As the result or the analysis, it is understood that the logarithm of the Lugeon values (logLu) and the logarithm of the amount of cement take (logC) can be dealt with as statistic values and the relationships of their mean values between the i-th order of grouting holes and the i+Ith order of grouting holes can be expressed as the recurrence equation. The improvement of watertightness of rock mass can be predicted according to these relationships.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1998 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Nagayama, Isao; Niitaka, Yosuke; Ota, Michio; and Yamashita, Masahiko, "A Study on Prediction of Improvement of Watertightness of Rock Mass by Grouting" (1998). International Conference on Case Histories in Geotechnical Engineering. 26.
https://scholarsmine.mst.edu/icchge/4icchge/4icchge-session02/26
A Study on Prediction of Improvement of Watertightness of Rock Mass by Grouting
St. Louis, Missouri
Grouting is a principal technique to improve watertightness of the foundation of dams. But it is not easy to predict the amount of grouting work until attaining the required improvement of watertightness of rock mass, since the improvement mechanism of watertightness by grouting is not understood comprehensively. Therefore, the grouting work is conducted with the split spacing method until attaining the required improvement. In this paper, the method to predict the effects of grouting is discussed analyzing grouting data obtained from the Hattabara Dam construction site. As the result or the analysis, it is understood that the logarithm of the Lugeon values (logLu) and the logarithm of the amount of cement take (logC) can be dealt with as statistic values and the relationships of their mean values between the i-th order of grouting holes and the i+Ith order of grouting holes can be expressed as the recurrence equation. The improvement of watertightness of rock mass can be predicted according to these relationships.
