振动直推多相抽提井在污染场地修复应用研究

Application of Vibratory Direct-Push Multi-Phase Extraction Wells in Contaminated Site Remediation

摘要:

针对城市更新污染场地多相抽提效率受限、抽提井易塌陷堵塞及长期运行稳定性不足等问题，研究提出振动直推一体化预制多相抽提井构建方法。以上海市松江区某氯代烃污染场地为对象，从井体结构、耐腐抗菌材料和振动直推工艺协同优化入手，开展中空螺旋钻、传统直推挤压和振动直推建井对比试验。结果表明，振动直推可减弱黏性土层“涂抹效应”，并与大口径成井通道共同改善井周水力连通性，抽提井影响半径达3.83 m；100 d运行监测结果显示：预制井筛缝通畅、沉积较少，在常规及连续高负荷抽提条件下仍保持有效真空响应。研究表明该技术可提高污染场地多相抽提成井质量和运行稳定性，为城市更新污染场地原位修复提供参考。

Abstract:

To address the limited efficiency of multi-phase extraction, frequent well collapse and clogging, and insufficient long-term operational stability in contaminated urban renewal sites, a vibratory direct-push integrated prefabricated multi-phase extraction well construction method was proposed. A chlorinated hydrocarbon-contaminated site in Songjiang District, Shanghai, was selected as the study area. Through coordinated optimization of well structure, corrosion-resistant and antibacterial materials, and vibratory direct-push installation, comparative field tests were conducted among hollow-stem auger drilling, conventional direct-push, and vibratory direct-push construction methods. The results show that vibratory direct-push can mitigate the smearing effect in cohesive soils and, together with the large-diameter construction channel, improve hydraulic connectivity around the well. The radius of influence reached 3.83 m. A 100-day operation monitoring test showed that the prefabricated well maintained clean screen slots, limited sediment accumulation, and effective vacuum response under both routine and continuous high-load extraction conditions. This study indicates that the proposed technology can improve well construction quality and operational stability for multi-phase extraction in contaminated sites, providing a reference for in-situ remediation of contaminated urban renewal sites.