Hydraulic fracturing enhanced in situ remediation of low-permeability contaminated soils:Injecting-extracting technology  

作　　者：He Chen Shi-Jin Feng Qi-Teng Zheng Hong-Xin Chen 

机构地区：[1]Department of Geotechnical Engineering,Tongji University,Shanghai,200092,China [2]State Key Laboratory of Disaster Reduction in Civil Engineering,Shanghai,200092,China [3]Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai,200092,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第4期2566-2575,共10页岩石力学与岩土工程学报(英文)

基　　金：supported by the National Key Research and Development Program of China (Grant No.2020YFC1808104);the National Natural Science Foundation of China (Grant Nos.42227804 and 41931289).

摘　　要：Due to severe mass transfer limitations,contaminated soils with low-permeability limit the accessibility of amendments,resulting in less effective or even ineffective remediation.Enhancing the mass transfer properties of low-permeability soils by hydraulic fracturing is a promising technique.A quasi-three-dimensional(quasi-3D)analytical model was presented that accounted for advection-diffusion-adsorption-degradation processes in the fracture-matrix system.The model combined the injection-extraction technique to investigate the enhanced transport of amendments in low-permeability contaminated soil by hydraulic fractures.Then,the injection strategy and controllable parameter optimization were comprehensively studied by analyzing the radial transport behavior of the amendment within hydraulic fractures.The results showed that higher injection volumetric rates accelerated the formation of a uniform line source within the fractures.Although the differences in the effective ratio of the amendment among different injection modes were not significant,considering the amendment utilization rate and cost reduction,the recommended injection strategy was the combination of continuous pulsing injection and periodic injection.

关 键 词：Low-permeability soil Hydraulic fracturing Enhanced remediation Injection-extraction technology Analytical solution 

分 类 号：X53[环境科学与工程—环境工程]