Multifunctional probe for underground gas detection

Abstract

The present invention discloses a multifunctional probe for underground gas detection. According to the present invention, the probe comprises a pore water pressure measurement module (1) positioned on the front end of the probe, and a resistivity measurement module (2) connected with the pore water pressure measurement module (1), wherein the pore water pressure measurement module (1) is provided for detecting the pore water pressure at different depths and the change condition of the pore water pressure when the probe is pressed in the soil, the resistivity measurement module (2) is provided for testing the resistivity change of the soil; a gas collection addition module (3) is provided for collecting the gas in the soil layer. With the multifunctional probe of the present invention, the detection process is convenient and rapid, and is not interfered by the surrounding electromagnetic environment and other complex conditions, such that the detection result is reliable and accurate.

Description

Technical field [0001] The invention involves civil engineering, transportation engineering, and environmental engineering fields, especially a new multifunctional probe that detects native or foreign toxic and harmful gases in underground soil. Background technique [0002] The development of underground space is an important way to sustainable development in the 21st century. Underground transportation systems (subway tunnels), high -rise building basement, underground municipal infrastructure, underground public service facilities, disaster prevention and production and storage facilities underground spaceIt has been gradually developed and used in many large cities.Due to the complex urban underground construction environment, especially large -scale linearly extended underground rail transit systems often travel through various complicated strata (such as abandoned plants and mining areas) that have been affected by human activities, in the deep foundation pit of the buildin...

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Problems solved by technology

[0003] People have done a lot of research on the detection of toxic and harmful gases in the atmosphere, and developed various gas collection and filtering devices, but there are few reports on the research of toxic and harmful gases in the soil profile involved in engineering construction. Restriction of gas detection means

Usually, gas detection in the soil layer is often not included in the work in the engineering investigation stage. In most cases, various gas collectors are used to collect the gas in the working space after a safety accident caused by toxic and harmful gases occurs in the construction stage. Indoor analysis of gas not only delays the timing of prevention, but also fails to guide the follow-up project; or excavate a soil profile in the shallow layer and install a gas collection probe, but the depth is limited and the disturbance is serious, which cannot represent the actual situation of the soil layer in situ , and limited by time and funds, it is difficult to arrange a large number of points, which cannot meet the actual needs of the project

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