Mechanical behaviour of cement-treated sand

Tariq, Khawaja Adeel; Maki, Takeshi

doi:10.1016/j.conbuildmat.2014.02.017

Cited by 23 publications

(5 citation statements)

References 5 publications

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“…Model Test System. In accordance with previous studies [16][17][18], in this work, the formation in the test interval was generalized to be a homogeneous and continuous Class VI weak surrounding rock, so as to carry out follow-up studies. Combined with the test conditions, the model test geometric similarity ratio C L was determined to be 1/30.…”

Section: Model Testmentioning

confidence: 74%

Instability Mechanism of Cavity‐Bearing Formation under Tunnel Excavation Disturbance

Liu

Wang

et al. 2020

Advances in Civil Engineering

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Urban subway construction inevitably causes disturbances to the rock strata. It can even cause ground collapse accidents when construction encounters a bad geological body in the stratum. To verify the influence of cavities on surface settlement and the mechanism of formation instability, the instability mechanism of cavity-bearing strata under tunnel excavation disturbance was herein studied by tests using self-designed indoor models and numerical simulations. This study was based on the concrete project case of Qingdao Metro. Two groups of experiments (with and without cavities) were designed to simulate the four-step excavation by staged unloading of an airbag. The results show that the settlement value in the cavity state was about twice as much as that in the nonvoid state at the same stage. Besides the first step of excavation, in the numerical simulation, the settlement value of the same stage is about 1.3 times that of the model test. Simulating the deformation process of the surrounding rock in model tests shows that, in the excavation of the tunnel, the collapse surface of the tunnel arch roof will be connected with the sliding surface of the formation cavity. The cavity will gradually change from a regular circle to an ellipse or may even close, resulting in a sudden increase in land subsidence or even ground collapse. This indicates that disturbance during tunnel excavation would cause greater instability in a stratum when bad geological bodies, such as cavities, exist in the stratum.

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Section: Model Testmentioning

confidence: 74%

Instability Mechanism of Cavity‐Bearing Formation under Tunnel Excavation Disturbance

Liu

Wang

et al. 2020

Advances in Civil Engineering

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“…If Pollack Periodica 16 (2021) 3, 94-100 element size is below 250 mm, post-peak softening increases. It is verified through finite element analysis [15]. The post-peak stress-strain relationship of cementtreated considering element size is adjusted by the introduction of compression softening factor C (Fig.…”

Section: Stress-strain Relation Dependency On Element Sizementioning

confidence: 93%

Modeling of stress-strain relation of cement-treated sand under compression

Tariq

Maki

2021

Pollack

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This research work has been conducted to model the uniaxial stress-strain compressive behavior of cement-treated sand and its post-peak softening area. The cylindrical specimens were produced by using limestone powder, sand and high early strength cement. The mixtures were made by using different ratios of water to cement with fixed ratio of limestone powder to cement and cement to sand. The stress-strain behavior in post-peak zone of cement-treated is adjusted with introduction of compression softening factor. Uniaxial compressive stress-strain relationships after amending the Japanese Society of Civil Engineers model are proposed. Finite element analysis shows that the suggested model estimates well the compressive behavior of cement-treated sand.

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“…In den vergangenen Jahren wurden umfangreiche Untersuchungen zum Post‐peak‐Verhalten von zementgebundenen Erdstoffen wie DSV‐Körper, Deep Soil Mixing‐Körper usw. mit und ohne Bewehrung durchgeführt . In gegenständlichen Untersuchungen wurde für die Modellierung der DSM‐Säulen sowie der bewehrten Bohrpfähle das ursprünglich für Spritzbeton entwickelte Stoffmodell nach verwendet.…”

Section: Numerische Studien Zur Untersuchung Von Zwei Ansätzen Für Stunclassified

Numerische Studien zur Sicherung von Baugruben und Geländesprüngen mit Stützscheiben

Marte¹,

Choosrithong²,

Schweiger³

2020

Geotechnik

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In diesem Beitrag wird die innere und äußere Tragwirkung von Sicherungen von Geländesprüngen mittels Stützscheiben bzw. schalenartig wirkenden Tragwerken numerisch untersucht. Solche Lösungsansätze zur Sicherung, z. B. von Baugrubenböschungen, können zum Einsatz kommen, wenn der Einbau von Zugelementen wie Anker oder Nägel, z. B. aufgrund von eingeschränkter Nutzbarkeit von Nachbargrundstücken, nicht möglich oder gewollt ist. Stützscheiben können durch überschnittene Großbohrpfähle, DSV‐Säulen oder Einmischelemente hergestellt werden. Der Nachweis der äußeren Tragfähigkeit erfolgt dabei im Allgemeinen durch ein vereinfachtes analytisches Verfahren, der sog. Palisadentheorie. Ein Nachweis der inneren Tragfähigkeit ist mit analytischen Verfahren praktisch kaum möglich. In den in diesem Beitrag diskutierten numerischen Untersuchungen wird das große Optimierungspotenzial derartiger Tragsysteme in Bezug auf die äußere Tragfähigkeit aufgezeigt, und auf Basis geeigneter Stoffmodelle für Boden und Baumaterial für die Stützscheiben wird die innere Tragwirkung derartiger Systeme eingehend diskutiert. Zusammenfassend wird aufgezeigt, dass bei Anwendung dreidimensionaler numerischer Berechnungsmethoden mit geeigneten Stoffmodellen, ein großes Einsparungspotenzial in der Dimensionierung derartiger Stützsysteme möglich ist.

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Mechanical behaviour of cement-treated sand

Cited by 23 publications

References 5 publications

Instability Mechanism of Cavity‐Bearing Formation under Tunnel Excavation Disturbance

Instability Mechanism of Cavity‐Bearing Formation under Tunnel Excavation Disturbance

Modeling of stress-strain relation of cement-treated sand under compression

Numerische Studien zur Sicherung von Baugruben und Geländesprüngen mit Stützscheiben

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