A calibration chamber apparatus for grout injection testing

Permeation grouting is a soil improvement technique widely used in geotechnical engineering to enhance the mechanical properties of soils. The method is based on the injection of consolidating mixtures of various types, which permeate throughout the soil porous matrix, leading to increased strength and stiffness. Studying the process both from the injection perspective and in terms of its effects on the soil is therefore of great importance. The effectiveness and practicability of permeation grouting are assessed in situ by means of field-testing campaigns. However, these field tests present several limitations, including high costs, limited process control, and the inability to directly observe the effects of injection on the soil structure. This research proposes an alternative laboratory-based technology that enables the study of permeation grouting under controlled conditions. The approach involves the design and construction of a calibration chamber capable of reproducing realistic injection scenarios and simulating field conditions.