中文摘要：

为了研究裂隙膨胀土渗气规律，采用自行设计加工的气体渗透测试装置，对人工制备裂隙膨胀土试样进行渗气试验。结果表明：压实膨胀土中气体渗透符合达西定律；试样完全切开且未夹纸条时，试样中仍然存在贯通裂隙，此时气体渗透系数相比压实膨胀土试样中的渗透系数提高了1倍；土中裂隙的存在为气体运移提供便利通道，改变气体原有运移路径，形成“优势流”现象；对比达西理论和非达西理论分析结果，土体中出现贯通人工裂隙时，采用非达西理论分析更合适。

英文摘要：

A series of gas permeability tests were carried out in order to study its permeability on expansive soil with artificial fissures using self-designed and made apparatus. The results show that Darcy＆#39;s law expresses the gas flow in the compacted expansive soil. When the soil sample is cut up completely, there is still a penetrated fissure within it that makes the permeability coefficient doubles. The fissures change the original gas flow path providing a convenient channel for it flows, consequently the “gas preferential flow” phenomenon could be observed in the fissured expansive soil. Comparing the theoretical analysis results of Darcy with that of non-Darcy, it is indicated that the non-Darcy theory is better than Darcy theory to analyze the gas permeability when there are artificial fissures in the soil.