The influence of tunnelling on the behaviour of pre-existing piled foundations in weathered soil

Lee, Cheol-Ju; Jeon, Young-Jin; Kim, Sunghee; Park, Innjoon

doi:10.12989/gae.2016.11.4.553

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…However, for a preliminary design, these approaches can be expensive and time-consuming. The 3D numerical calculation by finite element or by finite-difference has therefore become indispensable, as the complex geometry and the multiple interactions between the different components of the problem can be explicitly considered (Mroueh and Shahrour, 2002; Cheng et al , 2007; Yang et al , 2011; Lee, 2012, 2013; Zidan and Ramadan, 2015; Soomro et al , 2015; Lee et al , 2016; Al-Omari et al, 2019; Soomro et al , 2020; Huang et al , 2022; Soomro et al , 2022). Most of the studies carried out have focused on tunneling-induced pile responses in homogeneous soils.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical analyses of pile responses to tunneling-induced ground movements in bilayer soil

Houhou

Amari

Belounar³

2022

WJE

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Purpose This paper aims to investigate the responses of single piles and pile groups due to tunneling-induced ground movements in a two-layered soil system. The analyses mainly focus on the additional single pile responses in terms of bending moment, lateral deflection, axial force, shaft resistance and pile settlement. Subsequently, a series of parametric studies were carried out to better understand the responses of single piles induced by tunneling. To give further understanding regarding the pile groups, a 2 × 2 pile group with two different pile head conditions, namely, free and capped, was considered. Design/methodology/approach Using the PLAXIS three-dimensional (3D) software, a full 3D numerical modeling is performed to investigate the effects of ground movements caused by tunneling on adjacent pile foundations. The numerical model was validated using centrifuge test data found in the literature. The relevance of the 3D model is also judged by comparison with the 2D plane strain model using the PLAXIS 2D code. Findings The numerical test results reveal that tunneling induces significant displacements and internal forces in nearby piles. The magnitude and distribution of internal forces depend mainly on the position of the pile toe relative to the tunnel depth and the distance between the pile and the vertical axis of the tunnel. As the volume loss increases from 1% to 3%, the apparent loss of pile capacity increases from 11% to 20%. By increasing the pile length from 0.5 to 1.5 times, the tunnel depth, the maximum pile settlement and lateral deflection decrease by about 63% and 18%, respectively. On the other hand, the maximum bending moment and axial load increase by about 7 and 13 times, respectively. When the pile is located at a distance of 2.5 times the tunnel diameter (Dt), the additional pile responses become insignificant. It was found that an increase in tunnel depth from 1.5Dt to 2.5Dt (with a pile length of 3Dt) increases the maximum lateral deflection by about 420%. Regarding the interaction between tunneling and group of piles, a positive group effect was observed with a significant reduction of the internal forces in rear piles. The maximum bending moment of the front piles was found to be higher than that of the rear piles by about 47%. Originality/value Soil is a complex material that shows differently in primary loading, unloading and reloading with stress-dependent stiffness. This general behavior was not possibly being accounted for in simple elastic perfectly plastic Mohr–Coulomb model which is often used to predict the behavior of soils. Thus, in the present study, the more advanced hardening soil model with small-strain stiffness (HSsmall) is used to model the non-linear stress–strain soil behavior. Moreover, unlike previous studies THAT are usually based on the assumption that the soil is homogeneous and using numerical methods by decoupled loadings under plane strain conditions; in this study, the pile responses have been exhaustively investigated in a two-layered soil system using a fully coupled 3D numerical analysis that takes into account the real interactions between tunneling and pile foundations. The paper presents a distinctive set of findings and insights that provide valuable guidance for the design and construction of shield tunnels passing through pile foundations.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical analyses of pile responses to tunneling-induced ground movements in bilayer soil

Houhou

Amari

Belounar³

2022

WJE

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“…An increase in the population leads to a continuous growth of the number of vehicles, which is the cause of the acute problems of modern society. In this regard, interest in the use of underground space is expanding, thereby the volume of construction of underground structures increases [1][2][3][4][5]. As a result of a number of studies aimed at increasing productivity, a new approach to the construction of underground structures has been formed -Geokhod technology, the basic element of which is a new class of mining equipment -Geokhod [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Development of a mathematical model of the interaction of the knife actuator of geokhod with the semiconvex shape of the cutting edge of the knife with the mine faces rock

Aksenov¹,

Sadovets

Preis

et al. 2021

E3S Web Conf.

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The paper discusses the relevance of the research. To set the goal and objectives of the research, the developed schematic solution of the knife actuator of Geokhod with a semiconvex shape of the cutting edge of the knife is presented. There is no mathematical model of the interaction to determine the force parameters of the interaction of the knife actuator of Geokhod with the semiconvex shape of the cutting edge of the knife with the mine face rock. As a result, a mathematical model has been developed for the interaction of the knife actuator of Geokhod with the semiconvex shape of the cutting edge of the knife with the mine face rock. The obtained systems of analytical expressions make it possible to determine the projections of the components of the cutting forces on the axis of Geokhod and the plane perpendicular to the axis of Geokhod rotation, as well as the moment of the forces of resistance to cutting by the knife actuator of Geokhod with a semiconvex shape of the cutting edge of the knife.

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“…With the increase in the use of underground space for human needs, it is necessary to increase the volume of construction of underground useful spaces [1][2][3][4][5]. This, in turn, creates the prerequisites for an increase in the productivity of equipment.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Overturning Torque of the Cutting Forces of the Knife Actuating Device of the Geokhod

Aksenov¹,

Sadovets

Beglyakov

et al. 2021

E3S Web Conf.

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The paper considers the relevance of the research, indicated by the authors in the title of the article. As a result of the studies carried out, it was found that the overturning torque of the cutting forces occurs as a result of the imbalance of the system of cutting forces during the destruction of rocks by the actuating device of the geokhod. It was revealed that the value of the critical overturning torque of cutting forces is influenced by two force factors; this is the projection of the resistance of the soil to cutting on a plane perpendicular to the axis of rotation, as well as the total moment of resistance to cutting. As a result of the study, the critical values of the withdrawal force and overturning torque were obtained for specific mining conditions for the development and the specified geometric parameters of the actuating device of the geokhod. The resulting withdrawal force during the destruction of the face rock by the actuating device causes a deviation of the axis of geokhod rotation from the axis of the working’s route. Therefore, it becomes necessary to constantly monitor the deviation of the geokhod rotation axis from the axis of the working’s route, and, if necessary, to correct the geokhod displacement.

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The influence of tunnelling on the behaviour of pre-existing piled foundations in weathered soil

Cited by 10 publications

References 11 publications

Three-dimensional numerical analyses of pile responses to tunneling-induced ground movements in bilayer soil

Three-dimensional numerical analyses of pile responses to tunneling-induced ground movements in bilayer soil

Development of a mathematical model of the interaction of the knife actuator of geokhod with the semiconvex shape of the cutting edge of the knife with the mine faces rock

Determination of the Overturning Torque of the Cutting Forces of the Knife Actuating Device of the Geokhod

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