doi:10.16186/j.cnki.1673-9787.2019080038

Received:2019/08/12

Revised:2019/12/24

Published:2021/05/15

Experimental analysis on gas-bearing characteristics detection of shallow gas-richsoil layer in coastal area based on resistivity method

CHEN Yu1, GUO Liquan1, ZHANG Pingsong1, OU Yuanchao1, FU Ming2

1.School of Earth and Environment， Anhui University of Science and Technology， Huainan 232001 ， Anhui， China;2.Hefei Institute for Public Safety Research ， Tsinghua University， Hefei  230000 ， Anhui， China

Abstract:There are a lot of biomass gases in the shallow soft soil layer along the southeastern coast of China and the Yangtze River Delta region， which have a serious impact on underground engineering construction. In order to find out its distribution and response characteristics， the geoelectric model was constructed by numerical simulation method to simulate the gas-bearing characteristics of gas-rich soil under different conditions. Based on the simulation results， field detection and verification were carried out in a certain place in Hangzhou. The results showed that the response characteristics of geoelectric field were obvious after the soil layer was rich in gas， showing high resistivity anomaly， and which became weaker with the increase of depth of gasrich soil layer. There were several suspected enrichment areas of shallow gases in the test site， and the resistivi ty values were mostly distributed in the range of 40〜300 Q • m. It was enriched in the silty sand interbedded clay layer，the sandy silt interbedded muddy silty clay layer and muddy silty clay layer interbedded silty clay layer in the depth of 6〜30 m in the shape of 15〜25 m bands and lenses. It was feasible to use resistivity method to detect the gas-rich soil layer， which could provide the basis for the engineering exploration of gas layer distribution and evaluation effect.

Key words:gas-rich soil;resistivity method;numerical simulation;response characteristics of earth electric field

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