关键词: 注浆, 地层抬升, 数值模拟

Abstract: Grouting used to heave ground is a common measure adopted to control the settlements of ground and buildings in underground constructions. Presently, designs of grouting are based on field-monitoring and construction experiences. The numerical simulation of the grouting effect is realized by advancing the parameters of soil property in the grouting zone, while ignoring the compensation effect of ground heave due to grouting. The relationship of the volume of grouting, the soil volume strain increment, and the value of displacement is established by a study on the mechanisms of soil expansion caused by grouting. A numerical method is applied to simulate ground heave caused by grouting. In the numerical modeling, a method is defined to calculate soil volume strain. It is proposed to increase the volume of the element by applying a “fictitious” expanding pressure in the element. And The process of injection modeling can be controlled by estimating the element volume strain increment to see whether it has reached the soil volume strain increment. The advantage of this method is that the expanding pressure can be a “fictitious” stress in the element, but not a real one of grouting. Contrasting the numerical solutions with the analytical ones, the numerical method is proved to be proper and available.

Key words: grouting, ground heaving, numerical modeling