Experimental Study on Modification of Dispersed Soil based on Chemical Dispersion Mechanism Theory
Dispersed soil is widely distributed in northwest and northeast China.Due to environmental restrictions,many new water conservancy and hydropower projects have to choose dispersed soil as the anti-seepage material for the dam core wall.Due to its low anti-erosion ability,it is easy to cause dam pipe surge and roadbed instability.Therefore,how to improve its dispersion has become an urgent problem to be solved in the current water conservancy and hydropower project construction.In order to find out the modification effect and mechanism of dispersed soil,based on the theory of chemical dispersion mechanism,the modified test of MgO,CaO,MgCl2 and CaCl2 is carried out on the dispersed anti-seepage soil of a water conser-vancy project in Tibet,and the modified content range of the soil is 0.15%～1.50% .The results show that MgO at various contents basically has no modification function.When the content of CaO,MgCl2 and CaCl2 reaches 1%,the results of pinhole test,fragment test and pore water cation test all show that it is modified to non-dispersed soil,and the modification effect is favorable.Considering the operability,economy and influence of soil prop-erties and structure of on-site construction,it is recommended to use 1% MgCl2 to modify the dispersed anti-seepage soil on site.
dispersed soilmodification testchemical dispersion mechanismpinhole testfragment testpore water cation test
国家科技期刊平台
NSTL
万方数据
