Grouting experiment in a completely weathered granite dam abutment: case study on grouting technique and test analysis
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ORIGINAL ARTICLE
Grouting experiment in a completely weathered granite dam abutment: case study on grouting technique and test analysis Jinxi Dou1,2 · Guijin Zhang1,2 · Anzhong Chen3 · Boshi Yang1,2 · Ruiliang Xin1,2 · Jihong Duan4 · Hai Li4 Received: 8 March 2020 / Accepted: 10 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Anti-seepage grouting of earth-rock dams is an important aspect of dam construction projects. Completely weathered granite is a typical porous granular soil. Traditional grouting techniques cannot meet the requirements of completely weathered granite grouting. Therefore, pulsating grouting, which combines drilling and grouting, is proposed, and grouting experiments were performed on a completely weathered granite reservoir abutment in combination with traditional clay–cement slurry materials. The results show that single row, 1 m hole spacing of the permeability after grouting was less than 10 Lu. The acoustic wave velocity increased by 17.3–52.5%. Moreover, the core sample was relatively complete, and the compressive strength of the core reached 7.3 MPa on average. The proposed technique significantly reduces the unit cost is applicable to completely and strongly weathered granite and similar formations. Thus, this work provides an engineering reference for these formations. Keywords Grouting process · Completely weathered granite · Dam engineering · Lugeon test
Introduction Completely weathered granite is widely distributed in Honghe Prefecture, Yunnan Province, Southwest China. Due to the large variation in soft and hard rocks, these rocks are susceptible to the influence of various weathering processes, thereby forming weathered crusts with different degrees of weathering and uneven hardnesses and thicknesses (Fu et al. 2014; Liu et al. 2018). Because of the destroyed structure of completely weathered granite, seepage is typical in these loose and weak rocks (Li et al. 2019a; Shi et al. 2014). A large number of seepage prevention and reinforcement * Guijin Zhang [email protected] 1
School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
2
Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, Hunan, China
3
Power China Group, Zhongnan Engineering Corporation Limited, Changsha 410114, China
4
Honghe Water Conservancy and Hydropower Engineering of Geological Drilling Team, Mengzi 661400, China
projects need to be implemented during infrastructure construction in these formations, such as seepage prevention and reinforcement projects in reservoir projects. Grouting measures are often a preferred solution to the problem of seepage and reinforcement. Researchers have conducted research on seepage prevention and reinforcement of completely weathered granite. Cui et al. (2016) studied the grouting parameters of a shield tunnel in a mixed foundation of sand and soil on weathered granite. Modoni et al. (2019) studied the strength of
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