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2025-04-17 13:40 本頁面
【正文】 the capillary water should be negative. water In the finegrained soils,the grain surface has an ionized layer around them, which is defined as bound water. More and more people have known that the cohesion force,which is against shearing stress, is to a large extent, resulted from the bound water. The plastic properties of clay soil such as swelling and shrinkage of clay, is mainly attached to the bound water. It is a very important factor considered in the design of a foundation. See Fig. 14. water The interlayer water is hidden in a mineral. For example, the mineral,montmorillonitic has a layer structure, its interlayer space,is typically filled with water,originally filled, or filled later. Depending on the abundance or deficiency of water occupy this space, a montmorillonitic soil may exhibit its marked properties of swelling and montmorillonitic soil, as a loaded dTHc?foundation, is very unstable when water is present. Gas in a Soil Mass As always, gas basically exists in a soil mass. We differ between opened gas and closed gas. The opened gas is interconnected, and directly flows to atmosphere, while the closed gas former always takes place in the coarsegrained soil,which has little influence on the engineering properties of the soil. But the latter is so difficult to escape that there is a high pressibility and a low permeability for the engineers should know that the presence of gas in the soil void is of great importance in the design of a foundation. The Structural Features of a Soil Mass Layers of Soil For the sedimentary formations, no matter whether they are winddeposited,waterdeposited or glacialdeposited, it is natural that there are different layers of soil,finegrained soil or coarsegrained layers are often embedded in coarsegrained layers and vice versa. We can also say,from the soil mechanics point of view, high bearing capacit
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