Field Study on Horizontal Directional Drilling Technology in Diversion Governance of Landfill Leachate

Abstract:

As one method of Trenchless, HDD technology is widely used in new pipeline laying and existing pipeline repair in the fields of water supply and drainage, electric power, communication, oil and gas associated with its advantages of low environmental interference and high construction efficiency. This paper presents the leachate diversion governance project of a landfill in the UK by HDD. Based on the technical principle, engineering background, process, application effect and improvement measures, some practices were achieved by the authors. Field practice indicates that HDD technology can be applied to the construction of horizontal discharge holes of landfill leachate, and the construction process should be optimized according to the site conditions and process parameters. Since the landfill contains a large amount of metal waste, the wireless electromagnetic guidance is replaced by a wired guiding system, which can greatly improve the positioning accuracy of the guiding drilling trajectory. The use of forward and over-reaming and pipe laying techniques helps to reduce drag and improve laying. The comparison operation results indicate that compared with the traditional leachate shaft drainage mode, the horizontal drilling efficiency is higher and the cost input is relatively lower. However, the impact of the heterogeneity of the pile on the construction process should be fully considered in the design and construction to reduce construction risks.