Device and method for humidifying soil body by combining vacuum pump suction with steam

Abstract

The invention discloses a device for humidifying a soil body by combining vacuum pump suction with steam. The device comprises a steam generator, a vacuum pump and a humidifying chamber, wherein a humidifying pipe is arranged in the humidifying chamber, a plurality of holes used for steam diffusion are distributed in a pipe body of the humidifying pipe, and one end of the humidifying pipe is connected with a steam generator through a gas conveying pipeline. And the vacuum pump is connected with the humidifying chamber through an exhaust pipeline. The method for humidifying the soil body by using the device comprises the following steps that the soil body is filled into the humidifying chamber; the steam is input into the humidifying chamber until the pressure in the humidifying chamber reaches a preset pressure value, and the pressure value is kept for a certain time; after the primary humidification is completed, vacuumizing is started; after the humidity of the soil body reaches the preset humidity, steam input and vacuumizing are stopped, and stuffy material treatment is conducted for a certain time. The equipment is simple to install and operate, has the characteristics of rapidness, economy and good humidifying effect, and can effectively overcome the defects of long humidifying time, large water demand, poor uniformity and the like when the soil body is humidified by an existing water immersion method.

Description

technical field [0001] The invention belongs to the field of soil humidification, and in particular relates to a device and method for vacuum pumping combined with steam humidification of soil. Background technique [0002] In Northwest my country, natural loess with the characteristics of large thickness, low strength, low water content and strong collapsibility is widely distributed. Because of its loose structure, well-developed pores, and rich in soluble salts, its After soaking, the strength decreases rapidly and the deformation increases greatly, which seriously affects the service performance and life cycle of the superstructure. Therefore, it is necessary to carry out foundation treatment before the construction of structures to solve the problems of low bearing capacity and strong collapsibility of loess, so as to improve the bearing capacity and deformation resistance of loess foundation. [0003] At present, commonly used soil humidification methods include: pre-w...

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Problems solved by technology

Among them, the humidification time of the pre-wetting method is faster, the degree of humidification is easy to control, and the humidification effect is better, but it cannot be humidified in batches, and it needs to be treated individually, such as simulating the humidification of a small amount of soil in the laboratory; although the soaking method can be used in batches Humidification, but the humidification takes a long time, requires a large amount of water, the uniformity of humidification is poor, and the range of humidification is difficult to control; although the bagged sand well water injection humidification method takes a relatively short time, it has poor humidification uniformity and humidification. Disadvantages such as small wet range and uncontrollable

[0004] The applicant has disclosed a method of using water vapor to humidify the soil in CN 111519601B. This method improves the uniformity of the moisture content of the soil by controlling the pressure and time of segmental humidification, but the segmental humidification operation is complicated ,time consuming

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