Study On Deep-seated High Liquid Limit Soil Cutting Slope Stability Analysis And Treatment Technology In Mountain Area

High liquid limit soil is a special soil which is harmful to the project. High liquid limit soil is distributed widely in the southwest mountainou areas of China, with the highway advance to the mountains, disease often happened in the construction process of slope due to the high liquid limit soil , so high liquid limit soil slope construction problems received increasing attention. This paper relied on Shi-Zhong Chongqing highway cutting slope construction technology, conducted a systematic study on deep-seated high liquid limit soil cutting slope stability analysis and treatment technology of mountainous highway, and achieved some positive results.Through scene investigation, laboratory testing and field research, the distribution of high liquid limit soil in mountain area was proved, as well as major engineering properties: compared to ordinary clay, high liquid limit soil has such character as the higher water content, the greater compressibility and the weaker permeability, having certain swell-shrink characteristics, soil strength being strongly affected by rainfall, the uneven distribution, doing great harm to the road construction. To aim at complex geological and climatic conditions of mountain, as well as the engineering properties of high liquid limit soil, this paper analyzed the prophase stability of deep-seated high liquid limit soil slope, advanced applying slope cutting, gravity retaining wall, soil nails, soil nails + gravity retaining wall and other measures treated deep-seated high liquid limit soil slope, and conducted the slope drainage design and slope protection design.By using the finite difference method FLAC procedures, the paper gave a preliminary stability analysis of deep-seated high liquid limit soil cutting slope in Shi-Zhong expressway, and advanced numerical simulation analysis of the treatment effect of the slope cutting, gravity retaining walls, soil nails, soil nailing gravity retaining and wall reinforcement measures and so on, evaluated the reasonableness of the treatment project, and with an emphasis on soil nailing structure parameters of the orthogonal test. At the same time, took the geotechnical centrifuge model tests of treatment of deep-seated high liquid limit soil cutting slope in laboratory and observed level and slope model of vertical displacement, and further measures to verify the efficiency and rationality of treatment. Numerical simulation analysis and geotechnical centrifuge model test results showed that the treatment four measures such as the slope cutting, gravity retaining walls, soil nails, soil nailing and gravity retaining wall, could improve the slope of the stress and deformation properties and greatly enhance the overall stability of slope.The paper conducted a systematic study on deep-seated high liquid limit soil cutting slope stability analysis and treatment technology from three aspects such as theoretical analysis, numerical simulation and model test, drawed some general conclusions that provide a reliable theoretical basis for practical engineering applications, as well as further research.The paper abtained assistance of the 2006 Chongqing municipal transportation committee technology projects "Shi Zhong highway under complicated geological conditions roadbed construction technology".