Discriminating the Dispersion of Soil Materials for a Core Wall Dam and Analyzing the Performance Regularity of Lime Modified Soil
The use of dispersed soil as a clay core wall will affect the anti-seepage safety of the dam.The dispersibility of a certain core wall soil material in Xinjiang was identified through pinhole tests and fragment tests.Natural river water and lime were used for modification tests to study the effects of different lime dosages and aging times on the physical and mechanical properties of the modified soil.The results indi-cate that a clay content of 12%is the boundary for the physical and chemical dispersion of soil materials.The use of natural river water for modification has poor results.When the lime content is 3%,dispersion can be completely eliminated.After adding 1%lime to the soil,the boundary moisture content changes significantly,with the maximum dry density decreasing from 1.79 g/cm3 to 1.69 g/cm3,the compressive modulus increasing from 13.4 MPa to 19.4 MPa,and the cohesion increasing from 25.1 kPa to 43.3 kPa.With the increase of lime content,the maximum dry density and internal friction angle decrease,while the cohesion increases.With the increase of aging time,the liquid limit shows an increasing trend.The maximum dry density is relatively stable within 24 hours,then begins to decrease,and then stabilizes after 240 hours.Compressibility does not change significantly within 72 hours and then begins to increase.Because the lime contains a large amount of calcium ions,the performance of dispersed soil are changed.
dispersive soilmodification testlime contentaging timephysical and mechanical properties
万方数据
维普
