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Effects of gas pressure and confining pressure on gas flow behavior in saturated cohesive soils with low permeability

机译：气体压力和狭窄压力对低渗透性饱和粘性土壤气流行为的影响

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摘要

Gas flow behavior in saturated cohesive soils having low permeability is a major concern in most engineering practices. The effect of stress, including that caused by gas pressure and confining pressure, on gas permeability must be investigated in detail. In the present study, gas permeability tests with cyclic gas pressure, as well as different gas and confining pressures, were conducted. Results showed that a sudden increase in the gas flow rate appeared when the gas pressure approached the confining pressure. This increase in gas flow was possibly caused by a gas leakage along the lateral boundary, which was not the true gas breakthrough. The real gas breakthrough linearly increased with the increase of intrinsic permeability at a log-log scale. In gas permeability tests, the cyclic gas pressure induced a significant hysteresis: the gas flow rate during decreasing stages of gas pressure was higher than that during increasing stages. In addition, increasing confining pressure weakened this phenomenon. Under a constant confining pressure, gas permeability increased significantly with the gas pressure increased. However, little variation was aroused by increasing the confining pressure under a constant gas pressure. In conjunction with the pore size distribution determined in mercury intrusion porosimetry test, it can be concluded that, gas flow behavior in saturated cohesive soils with low permeability was mainly controlled by the capillary effect, even though the mechanical effect was presented during the gas migration process.
机译：具有低渗透性的饱和粘性土壤中的气体流动性是大多数工程实践中的主要问题。必须详细研究应力，包括由气体压力和限制压力引起的压力和限制性的渗透性。在本研究中，进行循环气体压力以及不同的气体和限制压力的透气性试验。结果表明，当气压接近狭窄压力时，出现了气体流速的突然增加。气流的这种增加可能是由沿着横向边界的气体泄漏引起的，这不是真正的气体突破。随着日志测量的内在渗透率的增加，实际气体突破线性地增加。在透气性测试中，循环气体压力诱导显着的滞后：气体压力级的降低期间的气体流速高于增加期间的气体流速。此外，增加限制压力削弱了这种现象。在恒定的限制压力下，气体压力增加，透气性显着增加。然而，通过在恒定气体压力下增加限制压力，引起了很小的变化。结合汞侵入孔隙测定法测定的孔径分布，可以得出结论，即使在气体迁移过程中呈现机械效果，饱和粘性土壤中的气体流动性也主要受毛细血管作用控制。

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