黄土覆盖层气体突破和循环气体渗透特性试验研究

doi:10.16285/j.rsm.2023.0739

Rock and Soil Mechanics ›› 2024, Vol. 45 ›› Issue (S1): 471-476.doi: 10.16285/j.rsm.2023.0739

• Fundamental Theory and Experimental Research • Previous Articles Next Articles

Experimental study on gas breakthrough pressure and cyclic gas permeability characteristics of loess cover layer

WEN Shao-jie^{1, 2}, CHENG Wen-chieh^{1, 2}, HU Wen-le^{1, 2}

1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China; 2. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China

Received:2023-06-06 Accepted:2023-08-09 Online:2024-09-18 Published:2024-09-21
Supported by:
This work was supported by the Organization Department of the Central Committee’s ‘Overseas High-Level Youth Talents Recruitment Program’ (2019).

Abstract

Abstract: Unprocessed landfill waste continues to produce large amounts of hazardous gases, and the building of a cover system is an effective method to reduce the emission of landfill gas. However, the accumulation of hazardous gases may result in landfill cover breakdown or airburst accidents. This study investigates gas breakthrough pressure and emission from landfill covers by conducting tests on compacted loess specimens, commonly used as cover material in northwest China. Results indicate that at low gas pressures, gas emission from saturated compacted loess is minimal. As gas pressure reaches a threshold, emission rates rise sharply. The gas breakthrough pressure of compacted loess increases with increasing effective stress. With effective pressure increasing from 10 kPa to 20 kPa and 30 kPa, gas breakthrough pressures increase from 28.95 kPa to 30.97 kPa and 37.27 kPa, respectively. In the cyclic gas permeability test, the gas permeability characteristics of compacted loess specimens show hysteresis. In addition, An exponential relationship exists between specimen volume change and effective stress induced by gas pressure. A significant specimen volume expansion due to reduced effective stress from increased gas pressure can signal impending destruction of landfill cover systems.

Key words: compacted loess, landfill, cover system, gas breakthrough pressure, gas permeability

CLC Number:

TU431

WEN Shao-jie, CHENG Wen-chieh, HU Wen-le, . Experimental study on gas breakthrough pressure and cyclic gas permeability characteristics of loess cover layer[J].Rock and Soil Mechanics, 2024, 45(S1): 471-476.

References

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