Clay soil moisture content measuring instrument and measuring method based on heating vaporization method

Abstract

The invention discloses a cohesive soil moisture content measuring instrument and method based on a heating vaporization method. The measuring instrument comprises a plurality of measuring units, wherein each measuring unit comprises a main connecting pipe, a heating permeable pipe, a semi-permeable membrane, a hygristor, a rubber air bag and an inflation pipe, the heating permeable pipe is arranged outside the main connecting pipe in a sleeving mode, a measuring chamber is formed between the heating permeable pipe and the main connecting pipe, the semi-permeable membrane is arranged on an inner wall of the heating permeable pipe, the hygristor wraps an outer wall of the main connecting pipe, and the rubber air bag is arranged below the measuring chamber; the inflation pipes of any two adjacent measuring units are communicated in a sealed mode, each inflation pipe is communicated with the corresponding annular air bag, and an upper end of the inflation pipe of the measuring unit on the topmost layer is communicated with external pressurizing equipment. According to the measuring method, the water content and the change of the water content in the continuous depth of the soil body can be continuously measured on site, the change of the water content of the soil body can be effectively monitored, and important technical support is provided for early warning of landslide disasters.

Description

technical field [0001] The invention relates to the technical field of measuring the moisture content of clayey soil, in particular to a measuring instrument and a measuring method for the moisture content of clayey soil based on a heating vaporization method. Background technique [0002] At present, there are usually oven method, infrared method, alcohol burning method and iron pan frying method to obtain the moisture content of cohesive soil. These methods mainly have the following defects: 1), all are directly defined according to the moisture content, take the soil body on the spot, obtain the quality of the soil body before and after drying, and the quality difference before and after is the quality of water, and the measuring method is simple, can only be in the laboratory Or on-site simple measurement; 2), only a certain depth of soil can be taken for a single measurement, and the moisture content of the continuous depth range of the soil cannot be obtained. Obtainin...

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Problems solved by technology

These methods mainly have the following defects: 1), all are directly defined according to the moisture content, take the soil body on the spot, obtain the quality of the soil body before and after drying, and the quality difference before and after is the quality of water, and the measuring method is simple, can only be in the laboratory Or on-site simple measurement; 2), only a certain depth of soil can be taken for a single measurement, and the moisture content of the continuous depth range of the soil cannot be obtained. Obtaining the moisture content of the continuous range requires repeated soil extraction for repeated test measurements. Repeated and cumbersome; 3), only the moisture content of the soil at a certain moment can be obtained, and the change of soil moisture content in a continuous period of time cannot be obtained

When using these methods to obtain the change of soil moisture content, it is necessary to take soil repeatedly for repeated test and measurement, and the soil needs to be re-drilled, which is inconvenient to operate and the accuracy is not high.

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