| In order to investigate the relationship between the soil water infiltration and slope,and analyze the connection between the rule of soil infiltration changes and the landslide, this paper carried out in the study on soil water infiltration of landslide impact, on the basis of the domestic and foreign slope stability test and slope test about the landslide and combined with the characteristics of Hunan slope. The main contents of the study include: the improvement of point source infiltration measurement system, the development of indoor soil landslide critical angle test device, the measurement of the ability of soil infiltration, study of the landslide critical angle, response time of landslide and field of outside landslide. This paper has supplied the study of slope sliding mechanism, with important practical significance and theoretical significance for the prevention and treatment of landslide. According to the research content, this paper could be divided to indoor experiment and field investigation.The main research results are summarized as flowers:(1)The independent research and development of the critical angle of slope landslide test apparatus is feasible.For the measurement of the critical angle of the slope landslide, slope landslide critical angle test device is developed. Through the indoor simulation experiment of landslide, confirmed that the test device has good feasibility.(2)Soil moisture content have great effect on soil landslideThe initial infiltration rate decreases with the increase of the surface water content, but the stable infiltration rate is not related to the surface water content of the soil.. In the initial stage, the soil moisture content is smaller, the soil water potential is lower, and the suction action of the water molecules is bigger.(3)Changes in soil wetting front have great effect on soil landslideThe experiment shows that: the effect is not obvious when the soil wetting front have not reach the bottom of the soil box, but the landslide critical angle get its maximum value when the soil wetting front get to the bottom which represent the strongest anti landslide soil. However, the landslide critical angle get its minimum value, after the formation of water film,The value of the angle between 18.5°-19.3°.(4)The analysis of mountain soil infiltration performanceDeterminate the water infiltration property of the bottom, top, lower and upper both in north and south line of Mount Yuelu. Results showed that: in the south of Mount Yuelu, the early soil infiltration rate is in 71.3-188.5mm/h; at the later stage of infiltration, the stable seepage velocity of soil maintain the range of 7.6-9.0mm/h. In the north of Mount Yuelu, the early soil infiltration rate is in 89.3-159.1mm/h; at the later stage of infiltration, the stable seepage velocity of soil maintain the range of 7.3-12.3mm/h.(5)The bulk density of soil has a significant effect on infiltration rateThis paper has measured the infiltration rate of those soil whose bulk density between 1.22g/cm3-1.27g/cm3. The result shows that: The initial infiltration rate is increased with the increase of soil bulk density, but there is no significant correlation between the stable infiltration and bulk density.(6)The response time of landslide is mainly affected by the soil bulk density, soil infiltration rate and the thickness of soil layer.The length of time is mainly affected by the soil porosity and the speed of soil infiltration. The model of calculating the response time of landslide as follows:Pb(g/cm3) represents the soil density; i(mm/h) represents the stable infiltration rate of soil; H(mm) represents the thickness of soil. |
PDF Full Text Request