Screening of desalination-alkali treatment materials of topographic soil for shield muck
In this study,we use a simulation test method to investigate the effects of various saline and alkaline treatment materials on three types of shield slag soil regarding pH,electrical conductivity,and total salt.The goal is to expedite the safe and creative treatment and utilization of shield slag soil.The research object is sodium bentonite-based,soda ash-based,and weakly alkaline shield slag soil.Desulfurized gypsum is a high-effect,economic,and environmentally friendly material compared with the solution of humic acid,red gypsum,and wood vinegar.For sodium bentonite-based type shield muck,when desulfurized gypsum is 2.0% of muck dry mass,the pH of shield muck can be reduced from 9.91 to below 8.0.For pure alkali shield muck,the amount of desulfurized gypsum is 2.5%,and the pH is reduced from 10.61 to below 8.0.For weak alkali type shield muck,the pH of shield muck can be reduced from 9.87 to below 8.0 when the desulfurization gypsum content is 0.5% .The aforementioned circumstances satisfy the requirements for soil use as described in"Specification for the Design of Parks"(DB11/T 1175-2015).Topographic soil can be created by treating shield slag soil with saline after desulfurized gypsum has been applied.
万方数据
维普
