Method for humidifying soil mass through water steam

Abstract

The invention discloses a method for humidifying a soil mass through water steam, and belongs to the field of geotechnical engineering construction. The method for humidifying the soil mass comprisesthe steps that humidification equipment composed of a storage barrel, a humidification pipe, an air conveying pipe, a pressure adjusting valve and a water steam generator is installed, and the humidification pipe is vertically arranged in the middle of the storage barrel and connected with the pressure adjusting valve through the air conveying pipe; the pressure adjusting valve is connected with the water steam generator through the air conveying pipe; soil sample filling is conducted; the water steam generator is started, the pressure of the pressure adjusting valve is set to be 0.02-0.10 Mpa, first-time humidification is conducted, and shutdown is conducted after 20-30 min; a soil sample base face is sealed, and damp return treatment is conducted for 10-12 h; the water steam generator isstarted, the pressure of the pressure adjusting valve is set to be 0.07-0.15 Mpa, second-time humidification is conducted, and shutdown is conducted after 6-7 h. By means of the method, large-volumesoil body humidification can be rapid, uniform and controllable, heat matter coupling diffusion migration under the actions of pressure gradient, water content gradient and temperature gradient can bemore effectively enhanced, and the advantage of good humidification uniformity is achieved.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering construction, and in particular relates to a method for humidifying soil by using water vapor. Background technique [0002] Natural loess is widely distributed in Northwest China. It has the characteristics of large thickness, low strength, low moisture content and strong collapsibility. Due to its special structure and composition, its strength decreases rapidly and its deformation increases greatly after being soaked in water. , seriously affecting the construction of structures. Therefore, in order to solve the collapsibility problem of loess and improve the bearing capacity and deformation resistance of the foundation, it is necessary to do foundation treatment before the construction of the structure. Existing foundation treatment methods include dynamic compaction, soil replacement, compaction piles and soil humidification. The first three are suitable for foundations with thinner ...

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