Abstract
The groutability of fissured rock masses is strongly dependent on fracture characteristics: degree of joint spacing, joint aperture, continuity, and presence of weathering in fill. Survey of the drill core boxes permits for estimating the degree of jointing spacing and joint aperture. Nonetheless, weathering in-fill and continuity cannot be detected. In this concept, the rock fracture groutability quality is defined by the Geological Groutability Index (GGI). A Geological Groutability Index (GGI), denoted as FGGI, may thus be defined as a numerical function of the components: joint spacing (BS) and joint hydraulic (JH), i.e., F GGI = f (BS, JH). The rock mass foundation with this index can be zoned according to different quality classes and each particularly improved zone. The proposed technique requires the interpretation of the results, from which the Lugeon (Lu) value effect in the section is certified, and the rock fracture classification criteria are applied. The GGI is an effective reference to foundation improvement design.
Highlights
Grouting is very common method of sealing rock and repairing concrete structures[1,2,3,4,5], and there are many examples of its use to the engineering of dam-foundation improvement[6,7,8]
To achieve the intended purpose, boreholes are drilled into the rock mass, and grout is injected under pressure until the fractures around the borehole are filled
When the geological stress is derived into consideration, the Joint Hydraulic (JH) of the grout section is considered as one of the factors that affect Geological Groutability Index (GGI)
Summary
Grouting is very common method of sealing rock and repairing concrete structures[1,2,3,4,5], and there are many examples of its use to the engineering of dam-foundation improvement[6,7,8]. The number of boreholes in the building documents of Seyahoo dam read 792 grout holes with 29943 m12 This disagreement resulted in a doubling of the quantity of gross number of boreholes from what was required in the primary design. This example shows the difficulty in number of grout holes approximation. Issues associated with sealing of dam by grouting are divided into three main areas: geology and the characterization of the rock mass; grouting materials; and grouting technology. These topics and related equations are treated below.
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