A self-control and visual grouting model test system and measurement method

Abstract

The invisibility of grouting has been one of the most challenging problems that still remain unsolved related to studies in grouting theory. This paper presents a self-control and visual grouting model test system to realize the visualization of grouting process in sand. This system consists of (1) visual simulation material of rock masses, (2) high-strength transparent device, (3) parameter-controlled grout pumping equipment and (4) continuous physical field measurement system. A kind of visual material is used to simulate sand. A transparent device, measuring 200 mm long, 100 mm wide, and 150 mm high, is the place where visual material filling and grout injection are conducted. This parameter-controlled grout pumping equipment can realize grouting with a constant injection rate within the range of 0–2 mm/s. In addition, the continuous physical field measurement system, comprised of laser, CCD camera, data analysis software and computer, can be used to obtain continuous physical field changes caused by grouting in sand. To verify the suitability of this test system, grouting simulation test in sand was conducted. Test results present that the grout diffusion pattern shows ellipsoid-shape, which matches well with previous studies. This test system is therefore capable of conducting visual grouting experiments.