Equivalent elastic modulus and Poisson ratio calculation method of cleavage grouting compound soil body

Abstract

The invention discloses an equivalent elastic modulus and Poisson ratio calculation method of a cleavage grouting compound soil body. The method comprises the following steps: on the basis of a cleavage grouting theory and the analysis of grouting grout bulbs, establishing a basic unit geometric model of tunnel grouting compound soil body strength; on the basis of an area equivalence principle, carrying out simplified analysis on the basic unit geometric model, and obtaining a simplified basic unit geometric model; and according to a deformation consistency principle, carrying out homogenization processing on the simplified basic unit geometric model, simplifying a constitutive relationship of grouting materials, and obtaining an equivalent elastic modulus E and a Poisson ration v. The method is simple in implementation, can deduce a compound elastic parameter of a cleavage grouting vein only through theoretical calculation, and avoids the complexity of an experiment test and the roughness of empirical estimation in practice. The method can independently obtain a relationship between an injection rate and the equivalent elastic modulus, the relationship between the injection rate and the Poisson ratio, the relationship between a pulp vein modulus and equivalent elastic modulus, the relationship between the pulp vein modulus and the Poisson ratio, the relationship between the pulp vein Poisson ratio and the equivalent elastic modulus and the relationship between the pulp vein Poisson ratio and the equivalent elastic modulus.

Description

technical field [0001] The invention relates to the field of engineering construction, in particular to a method for calculating the equivalent elastic modulus and equivalent Poisson's ratio of split grouting composite soil. The method can be used in engineering industries that can use split grouting, such as tunnel engineering construction, foundation reinforcement, etc. Background technique [0002] Split grouting technology has been widely used in various tunnels and geotechnical engineering fields, mainly for water stop, reinforcement, deviation correction, and uplift. In view of its importance in geotechnical engineering, scholars at home and abroad have done a lot of research on it through model tests, numerical simulations and theoretical analysis. However, because the process is complex and hidden, involving geotechnical, fluid, materials and other disciplines, the research on it is far from perfect, especially the quantitative research on the mechanical parameters ...

AI Technical Summary

Problems solved by technology

Li Ning and Zhang Wenju proposed to predict the elastic modulus and Poisson's ratio after grouting by the change of sound wave velocity, and verified it by numerical simulation and experiment respectively. The method used has certain universality, however, this method is more It is suitable for relatively uniform treatment such as infiltration grouting and cement-soil mixing reinforcement. For splitting grouting, the wave velocity uniformity is poor, and it is easily affected by the position and distance of the measuring points.

Qian Baoyuan conducted a theoretical exploration of the compressive modulus after split grouting, and obtained the formula for calculating the compressive modulus of composite soil, but only for the grout veins in the analysis, without considering the grout bubbles

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