岩土工程学报2026，Vol.48Issue(2)：320-327,8.DOI:10.11779/CJGE20241030
饱和砂中气体运移及地基破坏变形模型试验研究
Experimental study on mechanisms governing gas migration in saturated sands and resultant soil deformation
摘要
Abstract
Gas accumulation and migration are common in marine sediments,impacting the safety of subsea infrastructure,the evolution of submarine morphology,and potential greenhouse gas leakage.This study develops a dual-cylinder plunger pump for precise long-term gas injection to investigate gas breakthrough,migration,and associated deformation in saturated sands.Injection tests are conducted on soil samples with particle sizes of 0.15-0.3 mm(Group SG)and 0.3-0.6 mm(Group LG).Results show a strong linear correlation between breakthrough pressure and flow rate for the same grain size.Analysis indicates that the breakthrough pressure difference between the two grain sizes approximates the theoretical minimum capillary force calculated from linear interpolation of the coordination number for different particle arrangements.Regarding deformation patterns:in SG and LG under high injection rates,gas initially invades via capillary invasion,follows by fracture invasion.At low injection rates,LG exhibits only capillary invasion.Two dimensionless parameters,ΧC and ΧE,were introduced to quantify the influence of capillary forces and excess pore pressure.ΧC governs flow direction during the capillary invasion and the gas saturation of the soil.ΧE>1 is a necessary condition for fracture invasion and influences the height of the initial fracture onset.At high injection rates in SG,a downward trend in injection pressure suggests soil failure and fluidization.V-shaped features observed in layered soil in long-term gas injection tests can provide evidence for hypotheses related to stratigraphic deformation caused by repeated eruptions of fluid in conduits.关键词
气体运移/砂土/模型试验/毛细入侵/劈裂Key words
gas migration/sand soil/model test/capillary invasion/fracture invasion分类
建筑与水利引用本文复制引用
龙轶雯,王思刘,孙伟伦,孔德琼,王路君,朱斌..饱和砂中气体运移及地基破坏变形模型试验研究[J].岩土工程学报,2026,48(2):320-327,8.基金项目
国家重大科研仪器研制项目(52127815) （52127815）
浙江省自然科学基金杰出青年项目(LR23E090001) （LR23E090001）
卓越研究群体项目(原基础科学中心项目)(52588202)This work was supported by the National Natural Science Foundation of China(Grant No.52127815) （原基础科学中心项目）
the Excellent Youth Program of Natural Science Foundation of Zhejiang Province(Grant No.LR23E090001) （Grant No.LR23E090001）
the Outstanding Research Group Program(Grant No.52588202). （Grant No.52588202）
