Abstract
The prediction of the unit grouting quantity is one of the key points in the design and construction of karst curtain grouting. Because of the concealment and complexity of the karst curtain grouting project, there is no reliable solution to this problem. In this paper, based on the calculation method of water permeability in water-pressure test in grouting engineering, Poiseuille flow equation in fluid mechanics, and cubic law, the relationship between the unit grouting quantity and the water permeability of rock strata in karst curtain grouting is studied. It is found that there is a nonlinear positive correlation between the unit grouting quantity and the water permeability of rock strata in karst curtain grouting, which is in the form of power function. At the same time, the comprehensive coefficient of karst curtain grouting ( K ) is introduced to describe the quantitative relationship between the unit grouting quantity and the water permeability of rock strata. K is comprehensively characterized by three controlling factors, namely, the characteristics of slurry fluid, the characteristics of grouted rock strata, and the technical factors of grouting in karst curtain grouting. Based on this theoretical relationship, a method for predicting the unit grouting quantity in karst curtain grouting by the water permeability of rock strata is proposed in this paper. Finally, based on the typical example of karst curtain grouting project, through the field grouting test and nonlinear function fitting, the comprehensive coefficient of karst curtain grouting ( K ) is 24.37 in the area of strong karst development, and it is 16.51 in the area of weak karst development. The proposed method is applied to the prediction of the unit grouting quantity in the main project of karst curtain grouting, and the results verify the rationality and applicability of the method. This study has a certain reference value and guiding role in the design, construction, and theoretical research of karst curtain grouting.
Highlights
Karstification geomorphology is widely distributed and large in Southwestern China [1,2]
Theusing unit grouting quantity water curtain permeability of rock obtained in thefor testthe arefield recorded; grouting quantity and the water permeability of rock strata obtained in the test are recorded; (ii) using the test data and nonlinear function fitting, the comprehensive coefficient of karst curtain grouting the test data and nonlinear function fitting, the comprehensive coefficient of karst curtain grouting is is determined; (iii) Equation (16) is used to predict the unit grouting quantity by using the water determined; (iii)
A prediction method of the unit grouting quantity in karst curtain grouting based on the water permeability of rock strata was proposed
Summary
Karstification geomorphology is widely distributed and large in Southwestern China [1,2]. In this paper, based on the study of the theoretical relationship between the unit grouting quantity and the water permeability of rock strata in karst curtain grouting, a method of predicting the unit grouting quantity in karst curtain grouting, by using the water permeability of rock strata, is put forward. In the combination relationship between the water permeability of rock strata and the unit grouting quantity, the combination of high water permeability of rock strata and large unit grouting quantity often appears, which is the reason why karstification strata must adopt grouting method to plug natural karst cracks in order to achieve the purpose of seepage control. The current regulations and codes for hydraulic design and construction in China [27,28] specify that the international Lugeon test is adopted as the basic method for obtaining the water permeability of rock strata (Lugeon Value) It is widely used in grouting engineering.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
