efficacy of grouting in head race tunnel

(PDF) Efficacy of grouting in head race tunnel

“Efficacy of grouting in head race tunn el of Tala Hy droe lectr ic Proj ect, Journal of Rock Mechanics and Tunnellin g Tech nology , Volume 17, No. 1, pp. 39-49.

Effectiveness of Post-injection Grouting in Controlling

initial alignment. Longitudinal section of head race tunnel is shown in Fig. 2. This paper deals with quality assurance during contact/consolidation grouting of 23 km long HRT and checking of efficacy of grouting by conducting permeability tests before and after consolidation grouting along with grout intake. 2. GROUTING 2.1 Need for Grouting …

Grouting techniques for the unfavorable geological

Effectiveness of Post-injection Grouting in Controlling Leakage: A Case Study Article (PDF Available) in Hydro Nepal Journal of Water Energy and Environment 8(Issue No. 8) · January 2011 with 365 …

Grouting is critically important in tunnel engineering. The compaction grouting mode or hydro-fracture grouting mode can be used depending on the local geological conditions of the given project (Soga et al., 2004).To date, the majority of grouting applications have adopted the soil fracture technique (Essler et al., 2000).However, as grouting is a complex process, both permeation grouting and …Cited by: 18

The headrace tunnel, which is the main focus of this pa-per, is a low pressurized tunnel with maximum and min-imum static water head of 1.1 and 4 bars at its upstream and downstream end, respectively (Figure 3). The head-race tunnel is approximately 7.9 kilometers long with inverted D-shape and 14 square meters cross-section.

The aim of PEG is to seal off joints and fissures in the rock mass by providing grout screens along the tunnel or cavern, which can stop or reduce water ingress during excavation. Figure 1 shows a typical illustration of systematic grout screens with overlap around an underground space. … ground water head (e.g. > 20 bar). It should be quite …