土壤力学土壤力学英文 (8).ppt
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1、Soil CompactionSoil compaction is perhaps the least expensive way of improving soils.Many well-preserved ancient buildings in China were constructed up on compacted soils.Loose soil Compacted soil Compaction is the densification of soil by removal of air.Basic concepts(1)(2)(3)(4)The laboratory test
2、 generally used to obtain the maximum dry unit weight of compaction and the optimum moisture content is called the Proctor compaction test.Standard Proctor testModified Proctor testCompaction energy:594 kJ/m3Compaction energy:2695 kJ/m3Dry Unit WeightWater Content(w)Optimum water contentMaximum dryu
3、nit weightZero-air-void line,S=100%Compaction curve for fine-grained soilsWhy there is a peak?Dry Unit WeightWater Content(w)Optimum water contentMaximum dryunit weightCompaction curve for fine-grained soilsDry Unit WeightWater Content(w)Effect of compaction effortDry Unit WeightWater Content(w)Increasing compaction effort(E2 E1)Modified E2Standard E1Compaction quality controlDegree of compaction(DC)Typical required DC:90%98%
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