큰사람 과 함께

큰사람 과 함께

結果 (繁體中文) 1:

與大

結果 (繁體中文) 2:

和大人物一起

結果 (繁體中文) 3:

6.7 Structure of Compacted Clay SoilLambe (1958a) studied the effect of compaction on the structure of clay soils, and the resultsof his study are illustrated in Figure 6.9.If clay is compacted with a moisture content on thedry side of the optimum, as represented by point A, it will possess a flocculent structure.Thistype of structure results because, at low moisture content, the diffuse double layers of ions surrounding the clay particles cannot be fully developed;hence, the interparticle repulsion isreduced.This reduced repulsion results in a more random particle orientation and a lower dryunit weight.When the moisture content of compaction is increased, as shown by point B, thediffuse double layers around the particles expand, which increases the repulsion between theclay particles and gives a lower degree of flocculation and a higher dry unit weight.A continued increase in moisture content from B to C expands the double layers more.This expansionresults in a continued increase of repulsion between the particles and thus a still greater degreeof particle orientation and a more or less dispersed structure.However, the dry unit weightdecreases because the added water dilutes the concentration of soil solids per unit volume.At a given moisture content, higher compactive effort yields a more parallel orientationto the clay particles, which gives a more dispersed structure.The particles are closer and thesoil has a higher unit weight of compaction.This phenomenon can be seen by comparing pointA with point E in Figure 6.9.Figure 6.10 shows the variation in the degree of particle orientation with moldingwater content for compacted Boston blue clay.Works of Seed and Chan (1959) haveshown similar results for compacted kaolin clay.