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Gas injection test of remolded saturated soil with consolidation
Marine Georesources & Geotechnology ( IF 2.2 ) Pub Date : 2020-08-28 , DOI: 10.1080/1064119x.2020.1808744
Yiping Zhang 1 , Yongjin Chen 1 , Huabin Lv 1 , Mengxian Hu 1 , Yongchao Zhou 1
Affiliation  

Abstract

Investigation of gas migration in saturated soil is of great theoretical and practical significance in marine science and engineering. The transport of gas bubbles in soil and its effects on soil physical and mechanical properties can be further studied. Gas injection and permeability tests were conducted using a self-developed oedometer with gas injection and water infiltration. Before the gas injection test, the remolded saturated soil was consolidated in an oedometer device to an effective vertical stress of 100 kPa. Gas injection tests were then performed to investigate the transport mechanism of bubbles in saturated soil and the changes in water permeability after gas injection. The results show that it is difficult for gas to migrate through capillary invasion and fracturing from the pore scale owing to the high gas entry pressure in fine-grained sediments. Hence, initial gas migration mechanism in pore scale is elastic-plastic expansion. The scale of cavities expands from micron to millimeter during gas injection, and gas pressure for fracturing reduces with the expansion of cavities. The fracturing initiated in millimeter scale and gas invades further into the soil. Interconnections of cavities and cracks resulting in an increasing of drainage rate and coefficient of permeability.



中文翻译:

固结改造饱和土注气试验

摘要

饱和土壤中气体运移的研究在海洋科学与工程中具有重要的理论和实践意义。可以进一步研究气泡在土壤中的传输及其对土壤物理力学性质的影响。使用自主开发的注气渗水固井仪进行注气和渗透试验。在注气试验之前,将改造后的饱和土在固结仪装置中固结到有效垂直应力为 100 kPa。然后进行注气试验,研究气泡在饱和土壤中的运移机理和注气后透水性的变化。结果表明,细粒沉积物中气体进入压力高,气体难以从孔隙尺度通过毛细管侵入和压裂运移。因此,孔隙尺度的初始气体运移机制为弹塑性膨胀。注气过程中腔体的尺度从微米扩大到毫米,压裂气压随着腔体的扩大而降低。以毫米级开始的压裂和气体进一步侵入土壤。空洞和裂缝的相互连接导致排水率和渗透系数的增加。压裂气体压力随着腔体的扩大而降低。以毫米级开始的压裂和气体进一步侵入土壤。空洞和裂缝的相互连接导致排水率和渗透系数的增加。压裂气体压力随着腔体的扩大而降低。以毫米级开始的压裂和气体进一步侵入土壤。空洞和裂缝的相互连接导致排水率和渗透系数的增加。

更新日期:2020-08-28
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