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Journal: Academic Journal "Industrial Machine Building, Civil Engineering" (Vol.1, No. 46)

Publication Date:

Authors : ; ; ; ;

Page : 85-94

Keywords : loess soils; capillary wetting; coefficient of water saturation; jamming gas.;

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The article presents the results of research in the field and laboratory conditions, changes in the relations of phases and phase components at capillary-lifted and capillarysuspended moisture-capacity, which affect the compressibility of the soil. From the ratio of phases and phase components, you can determine the amount of soil sediment as a result compaction under the influence of the external load. К. Terzaghi as a reference compressibility characteristics of the soil as a result of compression test used phase change of attitude under the influence of stress and suggested indicator – coefficient of porosity. Its value is determined by the ratio of the pore volume to the volume of soil particle skeleton. Field investigations loess soils foundation construction is carried out in conditions of natural humidity and after soaking local. In the process of changing the ratio of moisture reservoirs between the phases and components that affect the resistance of soil stress. The capillary moistening in the field conditions in the absence of the external load causes a redistribution of the filling ratio of the pore volume water and gas. A.F. Lebedev highlighted two types of capillary moisture-capacity: lifting and suspended. The first image of the capillary fringe above the groundwater level, the second is formed in the vadose zone as a result of the infiltration of precipitation or production activities: irrigation, leakage of water communications, and others. Within the limits of the suspended capillary moisture-capacity, when the soil is moistened locally, there is a moving front of capillary moisture from the top down and limits the displacement of the gas and creates the conditions of jamming. The values of coefficient of water saturation, in the executed researches, are fixed within the limits of 0,6…0,8, and a capacity of the jammed gas is in unit of volume of soil – 0,09…0,12. At capillary-lifted moisture-capacity with the increase of distance from, when increasing the distance from the groundwater level, the value of the coefficient of water saturation decreases from 1,0, near its mark, to 0,71, to a distance of one to two meters. According to the results of laboratory tests determined the impact of the creation of conditions for the capillary water in the ratio of the degree of pore filling with water and gas. In the formation capillary-raised moisture content, the range of water saturation coefficient was 0,8...0,83, and the capacity of entrapped gas – 0,07 ... 0,09. The value of suspended capillary moisture capacity, when the value of the coefficient of water saturation close to 0,07...0,075 corresponds to the capacity of the compressed gas 0,12...0,15. According to the results of laboratory and field studies of water saturation coefficient is smaller and the capacity of the gas entrapped in the greater suspended-capillary moisturecapacity. When capillary-lifted these values change with increasing distance from the groundwater level.

Last modified: 2016-07-20 21:52:46