A kind of measuring instrument and measuring method of moisture content of clayey soil based on heating vaporization method

Abstract

The invention discloses a measuring instrument and measuring method for moisture content of cohesive soil based on a heating vaporization method. The measuring instrument includes a plurality of measuring units, and the measuring units include a main connecting pipe, a heating permeable pipe, a semi-permeable membrane, a humidity sensitive resistor, and a rubber air bag And the inflatable pipe, the heating permeable pipe is set outside the main connecting pipe, the measuring chamber is formed between the heating permeable pipe and the main connecting pipe, the semi-permeable membrane is set on the inner wall of the heating permeable pipe, and the hygrometer is wrapped on the outer wall of the main connecting pipe Above, the rubber airbag is set under the measurement chamber; the inflatable tubes of any two adjacent measurement units are sealed and communicated, and each inflatable tube is connected with the corresponding annular airbag. Pressurized equipment is connected. The measuring method of the invention can continuously measure the water content and its change in the continuous depth of the soil on site, can effectively monitor the change of the water content of the soil, and provide important technical support for the 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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