Detection of anomalies in diaphragm walls with crosshole sonic logging

SpruitRodriaan,; TolFrits, van; Broere, W.; Slob, Evert; NiederleithingerErnst,

doi:10.1139/cgj-2013-0204

Cited by 28 publications

(18 citation statements)

References 7 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, according to the levels derived from the temperature profiles, the upper 3 m of joint is expected to be of poor quality. This is in accordance with CSL measurements (Spruit et al 2014) and observations on site.…”

Section: Correlation With Manual Concrete Level Measurementssupporting

confidence: 93%

See 1 more Smart Citation

Distributed temperature sensing applied during diaphragm wall construction

et al. 2017

Self Cite

View full text Add to dashboard Cite

Distributed temperature sensing (DTS) can be used to monitor the production process of diaphragm walls. DTS is able to differentiate between already present or fresh bentonite suspensions during refreshing of the bentonite slurry in the trench. During concrete casting, DTS is able to differentiate between the bentonite suspension and concrete. As a result, the continuity of the casting process and the arrival of good grade concrete at crucial locations in the trench can be monitored. Tests conducted on laboratory models provided reference information for interpretation of field data. Field experiences have shown the benefits of DTS tests and the predictive value of the reference measurements. Results are compared with crosshole sonic logging measurements at the same location.Key words: distributed temperature sensing (DTS), diaphragm wall, joint, quality control.Résumé : Des capteurs de température distribués (CTD) peuvent être utilisés pour surveiller le processus de production de parois moulées. CTD est capable de faire la différence entre des suspensions de bentonite déjà présentes et des nouvelles lors de l'actualisation de la suspension de bentonite dans la tranchée est en course. Au cours de la coulée du béton, CTD est capable de faire la différence entre la suspension de bentonite et de béton. En conséquence, la continuité du processus de coulée et l'arrivée de béton de bonne qualité à des endroits cruciaux dans la tranchée peuvent être surveillés. Les essais effectués sur des modèles de laboratoire ont fourni des informations de référence pour l'interprétation des données sur le terrain. Des expériences de terrain ont montré les avantages des essais CTD et la valeur prédictive des mesures de référence. Les résultats sont comparés avec les mesures d'auscultation sonique au même endroit.Mots-clés : capteurs de température distribués (CTD), paroi moulée, joint, contrôle de qualité.

show abstract

Section: Correlation With Manual Concrete Level Measurementssupporting

confidence: 93%

“…Crosshole sonic logging (CSL) testing has recently been verified in the laboratory and successfully implemented in several projects in the Netherlands (Spruit et al 2014). Distributed temperature sensing (DTS) is envisioned as another method of detecting anomalies.…”

Section: Introductionmentioning

confidence: 99%

Distributed temperature sensing applied during diaphragm wall construction

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…In 2011, a preliminary effort was conducted by a commercial company specialising in resistance measurements, using their detection method (Vanni and Geutebrück 2011) on one of the test blocks ( Figure 5) that were produced for the CSL measurements (Spruit et al 2014). This test block was submerged for two weeks in a large container filled with water, and on the day the tests took place, the block was removed from the container.…”

Section: Tests On Block With Joint and Anomalymentioning

confidence: 99%

“…Because of these experiences, it was decided to investigate methods to detect anomalies in diaphragm walls, particularly around panel joints, prior to excavation of the building pit enclosed by the diaphragm walls. Although crosshole sonic logging (CSL) is the recommended method for detecting anomalies (Spruit et al 2014), it is sometimes useful to be able to verify the outcome of such measurements with a physically independent measurement.…”

Section: Introductionmentioning

confidence: 99%

The downward continuation of the tilt angle

Cooper

2016

Near Surface Geophysics

View full text Add to dashboard Cite

The tilt angle filter T can be used both to enhance images of aeromagnetic data and as the basis of semi‐automatic interpretation methods. For vertically magnetised and vertically dipping contacts, rescaling T by factor α is equivalent to computing T from sources with all depths decreased by a factor α. This downward continuation is much less sensitive to noise than Fourier transform‐based downward continuation techniques, and because it reduces interference, it allows more accurate source depth determination from methods such as the tilt‐depth method. The method can be applied irrespective of the source and magnetisation type if the tilt angle of the analytic signal amplitude is used.

show abstract

“…These parameters mainly include: contamination of the mixture by soil particles, influx of ground water and the risk of the potential mixing of bentonite suspension with the concrete mixture. Some of the sources in literature contain a remark that the penetration of ground water particles in the structure of the mixture is quite unlikely [2]. However, the considerable porosity of the concrete in the investigated wall and the leaks visible on its surface seem to contradict these claims [3].…”

Section: Introductionmentioning

confidence: 99%

Concrete properties in diaphragm walls embedded in non-cohesive soils

Czopowska-Lewandowicz

2018

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. Although diaphragm walls are massive and responsible structures whose building history has many years' tradition, the discovery of a variety of material faults is still common throughout their exploitation. Some of the most common ones are associated with the occurrence of leaks along the wall surface. This paper reports on the results of a study conducted into concrete quality in an existing building structure. The issues identified in this case include the potential penetration of groundwater and particles suspended in non-cohesive soils into the bentonite suspension and into the concrete mixture. The scope of the analysis also involved the possible occurrence of a mixing zone of bentonite suspension with the concrete mixture. The solutions presented in this paper were practically tested using an existing structure and the results confirm that the adopted approach needs to be thoroughly researched. The laboratory specimens derived from an unreinforced diaphragm wall were subjected to the following tests: concrete bulk density in the air-dried state, water absorption by concrete, depth of water penetration under pressure, compressive strength and determination of the quantitative phase composition test using X-ray diffraction method. The results clearly demonstrate the decrease of the concrete quality applied in a monolithic diaphragm wall in comparison to the reference samples taken at the phase when it was built. Due to the fact that it was impossible to identify the impact of the particular variables on the investigated structure, this paper focuses on their descriptive assessment. This discussion is based on the analysis of the results defining the physical and mechanical properties of the examined concrete coupled with observations made by the author and insights derived from literature.

show abstract

Detection of anomalies in diaphragm walls with crosshole sonic logging

Cited by 28 publications

References 7 publications

Distributed temperature sensing applied during diaphragm wall construction

Distributed temperature sensing applied during diaphragm wall construction

The downward continuation of the tilt angle

Concrete properties in diaphragm walls embedded in non-cohesive soils

Contact Info

Product

Resources

About