污染场地原位喷射注入工艺与修复机制研究

Research on in‑situ injection technology and remediation mechanisms for contaminated sites

我国地下水污染已呈现从点状污染向带状和面状污染发展的态势,传统修复材料投放工艺粗糙、在含水介质中难扩散,且地下水存在分层、赋存状态多变,注入参数控制难度大,易导致各层水交叉污染等问题。针对这些问题,本文提出了集垂直/导向钻进、旋转喷射注入、微压压裂扩散、扩张封隔等一体的原位喷射注入工艺,研制了配套钻进—注入一体化钻具,总结了喷射注入过程中修复材料的运移和修复机制,为污染场地原位修复系统的设计奠定基础,为绿色精准修复提供参考。

Groundwater contamination in China has developed from point‑like to band‑like and surface‑like contamination.Traditional remediation materials are roughly placed,difficult to diffuse in the water‑bearing media,and there are problems such as stratification of groundwater,variable storage states,difficulty in controlling injection parameters,and easy cross‑contamination of various layers of water.To address these problems,this paper proposes an in‑situ injection process that integrates vertical/guided drilling,rotary injection,micro‑pressure fracture diffusion and expansion seal,develops an integrated drilling-injection tool,summarises the transport of remediation materials and remediation mechanisms during injection,lays the foundation for the design of in‑situ remediation systems for contaminated sites,and provides a reference for green and precise remediation.