The Method of Using Salt Solubility Temperature Variation to Solidify Sandy Soil

Abstract

The invention provides a sand solidification method using the temperature effect on salt solubility change. The sand solidification method using the temperature effect on the salt solubility change comprises the steps that a saturated CaCl2 solution which is heated to be boiling is poured into sand; the CaCl2 solution infiltrates constantly under the effect of gravity; as the temperature declines, CaCl2 in the CaCl2 solution is separated out constantly, and the separated-out CaCl2 is attached to the contact parts among sand grains; subsequently, a Na2CO3 solution is slowly poured, and Na2CO3 reacts with the separated-out CaCl2 to generate CaCO3 and NaCl; and the NaCl dissolves in the Na2CO3 solution and continuously infiltrates, and the CaCO3 precipitates onto the contact parts among the sand grains to bond the sand together so that the loose sand is solidified into a whole. The sand solidification method using the temperature effect on the salt solubility change can achieve sand solidification.

Description

technical field

[0001] The invention relates to the technical field of soil solidification, and more specifically, relates to a method for reinforcing sandy soil by using temperature-varying properties of salt solubility. Background technique

[0002] Sandy soil is widely distributed on the earth's surface, and the area of ​​the world's top ten deserts accounts for 12% of the earth's land area. Sandy soil is a kind of loose body, its cohesion is zero, it cannot form a vertical slope, and it is easy to flow under the action of its own weight and wind force. At present, cement is mainly used as a gel to solidify sandy soil in construction projects. The energy consumption of cement production is high, and the air pollution is serious; the fluidity of cement is poor, and sandy soil can only be solidified by stirring or pressure grouting. There is also a kind of water glass (NaSiO 3 ) to solidify the sandy soil. Compared with cement, water glass has better fluidity, and can pen...

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