INVESTIGATION ON RESTRAINT EFFECT OF GEOGRIDS ON SHALLOW LAYER FAILURE OF EXPANSIVE SOIL SLOPE

摘要

In recent years, "expansive soil slope reinforced with geogrid" technology has been successfully applied in some projects in China, but there is lack of study on its engineering behavior and mechanism. Effect of long-term weathering of atmosphere on expansive soil is considered, an ideal elastoplastic model is adopted to simulate the behavior of interface between geogrids and expansive soil, numerical analysis of stress and deformation characteristics of expansive soil slope reinforced with geogrids is carried out, and the strength reduction method based on stress state is utilized to analyze the stability of reinforced slope. Based on the results, the restraint effect of geogrids on shallow failure of expansive soil slope under atmosphere weathering effect is studied. Results show that reinforced geogrid can effectively solve the shallow failure problem of expansive soil slope, and deformation of the slope is restrained to a greater or less extent with different vertical space between geogrids.