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• W2580692780 abstract "The focus of this research is on samples taken from the return flow. With these samples and within the context of the Marsdiep project it is investigated if Horizontal Directional Drilling (HDD) can be used as a Site Investigation (SI) technique. In the Marsdiep project the feasibility of a pipeline constructed using HDD between the island Texel and Den Helder is investigated. Marsdiep is the name of the water and tidal gully between Texel and Den Helder. Regular SI techniques are not feasible, due to among others; the length of 4.5km, the depth that is required for a HDD of this length and the tidal gully. The geology of the area is unknown so SI is required. For this purpose pilot drillings, the first part of a regular HDD project, are made at NAP-65m and NAP-85m from both Texel and Den Helder. These pilot drillings are adapted so that additional data are acquired. The rheologic properties are determined for samples taken from the return flow and the formation of the samples is determined after sieving. A range of possible source locations of the samples are calculated, using different scenarios based on the uncertainty with regards to the borehole diameter and the loss of drilling fluid. The results of the scenarios are compared to the results of the initial SIs, which consists of a seismic survey, onshore, vertical drillings and Cone Penetration Tests (CPTs). It is found that the source location of the samples can be calculated as one of the scenarios gave accurate results (scenario 5, drilling fluid loss 7% and a borehole diameter of 0.4m and 0.45m for respectively Texel and Den Helder). A geological cross-section is constructed based on the results of scenario 5 and initial SIs. In addition to the geology the suitability of HDD as a SI technique is investigated. It is found that with minor adaptations to a regular HDD it can be used in combination with other techniques to determine the geology of an area. The other SIs are required to compare the results to and to determine the best scenario. In order for HDD to be of use as a separate SI technique more extensive adaptations are required to minimize the uncertainties that required the use of scenarios in this research." @default.
• W2580692780 created "2017-02-03" @default.
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• W2580692780 date "2016-01-01" @default.
• W2580692780 modified "2023-09-27" @default.
• W2580692780 title "Site Investigation based on Return Flow in Horizontal Directional Drilling - Marsdiep Project" @default.
• W2580692780 hasPublicationYear "2016" @default.
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