Geotechnical assessment of ground conditions around a tilted building in Cairo–Egypt using geophysical approaches

Shaaban, Fathy; Ismail, Ahmed; Massoud, Usama; Mesbah, Hany; Lethy, Ahmed; Abbas, Abbas Mohamed

doi:10.1016/j.jaubas.2012.06.002

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…If the site has strong/extremely strong development of pores and fissures, the prediction result of this approach can only serve as a reference. According to the collected data and Cao et al work [19], the pores/fissures development at the site is closely correlated with rock surface undulation. The greater the undulation, the more intense the development.…”

Section: Control Conditionsmentioning

confidence: 68%

“…In karst engineering, geological radar [5][6][7][8][9], cross-hole computed tomography (CT) [10][11][12], and high-density electronic method [13,14] have been widely tested, while micro-gravity [15,16] and tube-wave method [17] have been developed. In engineering practice, multiple geophysical prospecting methods are usually applied synthetically, rather than used independently [18][19][20][21][22]. However, there are a wealth of factors affecting the detection accuracy and applicability of geophysical prospecting technology, among which groundwater is the most common one that influences the application of geophysical exploration in karst areas in China.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Depth Distribution Curve of Dissolution Rates Based on the Undulating Features of Rock Surfaces

2022

Teh. vjesn.

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In karst regions, the drilling into the rock layer is restricted, if the construction site has a thick overburden and a small upper load. The evaluation of karst development features beneath the site becomes a common technical difficulty in building foundation engineering. Drawing on our previous research into the depth distribution features of dissolution rate, this paper collects 1000 plus data on typical karst regions across China, and selects 65 data for detailed analysis. Specifically, the rock surface dissolution features were analyzed on the top and bottom of the strong dissolution zone, and used to set up the control conditions for the top and bottom predictions of the strong dissolution zone. On this basis, the authors provided a prediction method for the depth distribution curve of dissolution rates. The results show that the elevation of 75% dissolution rate can be regarded as the top elevation of the strong dissolution zone at the site, which controls the prediction error within 0.5 m. If the pores and fissures are not so developed at the karst site, the elevation of 15% dissolution rate can be regarded as the bottom elevation of the strong dissolution zone at the site. According to the top and bottom elevations, the authors derived the predicted curve of the depth distribution function for the dissolution rates at each site. The predicted curve basically overlapped the curve and scatterplot of the dissolution rates measured at the site, a sign of reliable prediction. The proposed prediction method for the depth distribution curve of the dissolution rates at karst construction sites mainly applies to the sites with undeveloped to moderately developed pores and fissures. Further research is needed to verify its effectiveness in sites with strongly developed pores and fissures.

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Section: Control Conditionsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Prediction of Depth Distribution Curve of Dissolution Rates Based on the Undulating Features of Rock Surfaces

2022

Teh. vjesn.

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“…Further, the stress acting in the plane parallel to the major axis of the slot also affects the contraction of the slot. The formulae given below account for the effect of all the above and can be used for evaluating the stresses (Equations ( 1) and ( 2)) [7].…”

Section: Flat Jack Testmentioning

confidence: 99%

Monitoring Instrumentation in Underground Structures

Maghsoudi¹,

Kalantari²

2014

OJCE

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Nowadays underground structures are very important. Based on observations of engineering; properties during geotechnical construction are an integral part of the design of underground structures. This research presents instrumentation as a tool to assist with these measurement observations, determine the need for modifications to loading or support arrangement. Also apart from above construction control, instrumentation is also indispensable for site investigation, design verification and safety of the structure. Instrumentation used in the construction of tunnels and subways can be implemented in three stages before, during operation and during operation are examined. Metro Railway Tunnels are constructed in populated area and have a more comprehensive instrumentation and monitoring program that additionally includes monitoring of ground conditions, underground water levels, tilt and settlement of nearby buildings or other structures of interest in the vicinity of the tunnel alignment. Instrumentation monitoring for metro railway tunnels includes monitoring of the structures under construction together with the ground, buildings and other facilities within the predicted zone of influence. Furthermore, instrumentation and subway tunnels in and around them increase accuracy of the different layers of the earth and excavation of the surrounding structures and make safety and accuracy. This paper presents the features of sophisticated instrumentation available today for geotechnical monitoring. A wide range of sophistic have been described with their applications ted electronic and mechanical instrumentation with different instrumentation schemes used to meet the requirements of different types of structures.

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“…Alors que les incertitudes associées aux informations géophysiques sont importantes, les informations obtenues par les méthodes géotechniques sont plus contraintes. Bien que la combinaison de ces deux types d'information soit pertinente, peu de méthodologies considèrent une combinaison mathématique des données acquises, optant plutôt pour une superposition graphique des résultats [2][3][4]. Afin de faciliter le diagnostic des digues en remblai, il est important d'être en capacité d'identifier les matériaux lithologiques présents dans la structure et de les distinguer.…”

Section: Introductionunclassified

Fusion de données géophysiques (TRE et MASW) et géotechniques (granulométrie) pour la caractérisation de digues en terre

Dezert,

Palma-Lopes,

Courivaud

et al. 2024

Rev. Fr. Geotech.

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La bonne caractérisation des ensembles lithologiques des digues en terre constitue un enjeu majeur dans un contexte de prévention de rupture d’ouvrage. En effet, les conséquences d’un tel événement peuvent s’avérer potentiellement catastrophiques (pertes humaines, graves impacts environnementaux et économiques). Les méthodologies reconnues pour caractériser les digues en terre comprennent classiquement des méthodes de reconnaissance géophysiques et géotechniques de natures complémentaires. Ce travail de recherche présente une méthodologie de fusion permettant la combinaison de données issues de ces deux types de sources d’information. Ici, les données utilisées proviennent d’une campagne de reconnaissance menée sur une digue de canal EDF. Les résultats obtenus ont été préalablement publiés et présentés sous forme d’un article de revue internationale à comité de lecture. Cette campagne de terrain regroupe trois types d’informations : résistivités électriques, vitesses d’ondes de cisaillement et analyses granulométriques d’échantillons. La méthodologie de fusion introduite repose sur le cadre théorique des masses de croyance. Tout en tenant compte des spécificités de chaque méthode (répartition spatiale, imprécisions et incertitudes des données), cette approche de fusion permet de quantifier le niveau de conflit entre les sources d’information ainsi que d’associer un indice de confiance aux caractérisations proposées. Les résultats de la fusion obtenus, dans le cadre du cas d’étude présenté, mettent en évidence la capacité de cette méthodologie à discriminer les unités lithologiques (remblais fins ou grossiers avec brèches calcaires, socle marneux ou calcaire) ainsi qu’à localiser les positions d’interfaces entre unités et les niveaux de confiance associés. Ces résultats sont en cohérence avec les connaissances déjà disponibles sur le contexte géologique du site et mettent en évidence l’intérêt de combiner des informations issues de sources de nature différente afin de tirer profit de leur complémentarité. Ces travaux ont montré un potentiel prometteur pour cette méthode, tant sur une digue de canal que sur une levée. Ils seront poursuivis par une étude comparative de différentes méthodes de fusion et par la mise en application sur de nouveaux cas réels d’études.

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Geotechnical assessment of ground conditions around a tilted building in Cairo–Egypt using geophysical approaches

Cited by 8 publications

References 8 publications

Prediction of Depth Distribution Curve of Dissolution Rates Based on the Undulating Features of Rock Surfaces

Prediction of Depth Distribution Curve of Dissolution Rates Based on the Undulating Features of Rock Surfaces

Monitoring Instrumentation in Underground Structures

Fusion de données géophysiques (TRE et MASW) et géotechniques (granulométrie) pour la caractérisation de digues en terre

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