Experimental Study On Saline Cemented Sandy Soil

Desertification has caused severe environmental degradation and economic poverty worldwide,and has been listed as one of the top ten development and environmental problems that threaten the survival of mankind.Wind and sand disasters are the world's most common ecological problems,causing and exacerbating desertification and affecting people's production and livelihood.The research on the prevention and control of wind and sand disasters has been a hot topic among scholars.Wind and sand disasters are mainly manifested in the erosion of soil,namely,the surface material is subjected to wind erosion,transportation and accumulation.One of the basic conditions for the formation of wind and sand disasters is that the surface has a lot of fine loose sand and soil material easily blown up by the wind.One way to control wind sand is to solidify the surface and reduce loose surface material.However,the most common and traditional consolidation method for quicksand fixation is not comprehensive,and the traditional consolidation method is to implant the sand grid.So,it is urgent to explore a new solution to quicksand.For key problems,such as sand soil and quicksand governance by natural salt crust in lop nur region consolidation quicksand phenomenon,this article has carried on the salt crust sand-fixation experiments:using a different quality score?concentration gradient?than the sodium sulfate?Na₂SO₄?,potassium chloride?KCl?,calcium chloride?CaCl₂?,sodium carbonate?Na₂CO₃?,sodium bicarbonate?NaHCO₃?,sodium chloride?NaCl?respectively cementation sand soil,through quantitative experimental analysis,to explore the best ability to resist wind erosion cementation sand soil of the best solutions.On the basis of this experiment,the field sand consolidation test was carried out in taklamakan desert.This study of Xinjiang Gurbantunggut southeast edge of sand soil,saline desert desert cementation experiments,explore skinning after cementation of compressive strength,toughness,profile and apparent characteristics,combining with the field not only test the following main conclusions:?1?In the six inorganic salts used in the experiment,sodium sulfate?Na₂SO₄?,potassium chloride?KCl?,calcium chloride?CaCl₂?,cementing wind sand soil crust type as internal crust;Sodium carbonate?Na₂CO₃?,sodium bicarbonate?NaHCO₃?,sodium chloride?NaCl?cementing wind sand soil crust type surface crust.Three internal crystallization of inorganic salt?Na₂SO₄,KCl,CaCl₂?there are many differences between cemented sand soil crust characteristics,three kinds of surface crystallization of inorganic salt?Na₂CO₃,NaHCO₃,NaCl?cemented sand soil crust feature also there is a big difference.?2?In the six inorganic salts used in the experiment,the maximum compressive strength of the crust under the same concentration was CaCl₂,and the smallest was Na₂CO₃.However,the crust formed by CaCl₂ is easy to absorb moisture,and the compressive strength of the crust after the deliquesce is rapidly decreased.In combination,Na₂SO₄,KCl and NaCl are more suitable for the cementation of wind sand soil.?3?In the northeast of the taklamakan desert ruoqiang 36 group conducting field mobile dune crust consolidation test,using inorganic salt as KCl and NaCl,both kinds of salt has a good effect of consolidation of sand soil,has a certain compressive strength and ability to resist wind erosion.