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http://dx.doi.org/10.9720/kseg.2018.2.297

A Validation Study on the Reinforcement Effect of Reservoir Grouting by Surface Wave Survey  

Bae, Hyungseop (Geotech Consultant, Co., Ltd.)
Lee, Yeong-Dong (Geotech Consultant, Co., Ltd.)
Won, Kyoung-Sik (Geotech Consultant, Co., Ltd.)
Publication Information
The Journal of Engineering Geology / v.28, no.2, 2018 , pp. 297-312 More about this Journal
Abstract
In order to assess the safety diagnosis and grouting reinforcement effect of old reservoir facility, local governments and public offices mainly use electrical resistivity survey. However, electrical resistivity survey is a qualitative evaluation that varies the resistivity value by various exploration conditions. It is also difficult to grasp the stiffness change directly related to the stability of reservoir, thus an electrical resistivity survey is not applicable to continuous stability monitoring after grouting. The purpose of this study is to investigate and validate the quantitative evaluation of reinforcement effect of reservoir with cement grouting through shear velocity (Vs), which is closely related to the stiffness (${\mu}$) of the ground. This study was carried out on two reservoir facilities. The reinforcement effect was evaluated by comparing the permeability test, standard penetration test, down-hole test and MASW(Multi-channel Analysis of Surface wave) survey before and after cement grouting. Shear wave velocity changes before and after grouting were analyzed by phase velocity difference and inversion analysis, respectively, and the reliability of the analytical results was evaluated by comparing with field test results. Shear wave velocity increases to 5~10% in case of the D levee, and 10~20% in the levee of H reservoir. These results are showed similar pattern to the field test results.
Keywords
Grouting; MASW; Shear velocity; Reservoir facility;
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