INFLUENCE OF POLYURETHANE RESIN INJECTION ON HYDRAULIC PROPERTIES OF EXPANSIVE SOIL
Injection of expansive polyurethane resin is a common underpinning solution for individual houses, which does not require the installation of additional footing elements. The expansive resin is simply injected into the soil under the building. When injected in expansive soils, which are very sensitive to water content changes, it is of particular importance to understand how the soil-resin composite behaves and how the resin may affect the soils hydraulic properties and swelling behaviour. This paper investigates the effect of the injected resin on the water flow in the soil-resin composite. Samples of polyurethane resin injected in a silty clay, and in a high plasticity heavy clay, are tested. The tests performed show that permeability of bulk foam is 10-8 m/s and 10-9 m/s. Where resin has a formed surface skin, infiltration is reduced to about 20％ of the bulk foam values. Where resin is formed in a crack in a silty clay soil, it is shown to increase the time to soil saturation by a factor of up to 30. The net effect is to reduce the soil mass permeability, limiting changes in moisture content and the short term swelling behaviour of the soil.
O.Buzzi S.G.Fityus Y.Sasaki
University of Newcastle, Australia
国际会议
南京
英文
539-544
2007-04-21（万方平台首次上网日期，不代表论文的发表时间）