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.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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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.