A numerical study on the seepage failure by heave in sheeted excavation pits

Koltuk, Serdar; Fernández-Steeger, Tomás Manuel; Azzam, Rafig

doi:10.12989/gae.2015.9.4.513

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…The water flow that vertically impacts the surface of the diaphragm wall will undergo a change in momentum, resulting in an impact force on the structure's surface. By modifying Equation ( 17), the water flow velocity only retains the x-component perpendicular to the diaphragm wall, which is given by Equation (18). Therefore, the fluid impact kinetic energy represented by Equation ( 18) can be used to qualitatively represent the impact force received by the diaphragm wall.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the fluid impact kinetic energy represented by Equation ( 18) can be used to qualitatively represent the impact force received by the diaphragm wall. P e = (γ w ∆z + p)Q x (18) where γ w is the heaviness of water, N/m 3 ; ∆z is the vertical height difference between a point and the defect in the CFD domain; p is the pressure of the fluid mesh in the CFD domain, N/m 2 ; and Q x is the velocity of fluid mesh perpendicular to the ground-connected wall, m 3 /s. To further investigate the mechanism of disaster development, combined with the engineering example of the pit excavation [9], the process of the abrupt and gradual change in the sand leakage is studied based on the analysis of the impact kinetic energy of the fluid.…”

Section: Discussionmentioning

confidence: 99%

“…However, there has been a lack of attention given to water and sand leakage in foundation pit engineering. In terms of research on ground settlement due to pit excavation considering hydraulic factors, researchers are currently focusing on the pit dewatering process, with little consideration given to the combined loss of water and sand [16][17][18]. Thus, the hazards of water and sand loss in foundation pits warrant Shanghai Metro [5] A large number of cracks appeared on the ground surface outside the foundation pit, and the settlement of the buildings around the foundation pit and the ground surface exceeded 40 mm High groundwater level; incomplete wall brushing at the joint of the enclosure structure -Korean Metro [6] Two students fell into a 3 m × 3 m sinkhole outside the pit…”

Section: Location Overview Reason Picturementioning

confidence: 99%

“…However, there has been a lack of attention given to water and sand leakage in foundation pit engineering. In terms of research on ground settlement due to pit excavation considering hydraulic factors, researchers are currently focusing on the pit dewatering process, with little consideration given to the combined loss of water and sand [16][17][18]. Thus, the hazards of water and sand loss in foundation pits warrant Foshan Metro Line [7] A fan-shaped settlement area with a diameter of about 13 m was formed with a surge point at the center, and the maximum surface settlement was 70 cm after 24 h…”

Section: Location Overview Reason Picturementioning

confidence: 99%

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Study on the Mechanism of Water and Sand Leakage in a Foundation Pit Retaining Structure Based on the Computational Fluid Dynamics–Discrete Element Method

Xu,

Zhang,

Wang

et al. 2024

Buildings

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The existence of defects in the enclosure structure is the primary cause of water and sand leakage in foundation pits, as well as being a significant source of danger in pit construction, but current research lacks an in-depth investigation of the generation mechanism and gestation process. In this paper, which comprehensively considers the microscopic particles and macroscopic level, the development mechanism of a water and sand leakage disaster in a foundation pit with a water-rich sand layer was studied using the principle of computational fluid dynamics and discrete element method coupled analysis (CFD–DEM); moreover, based on the anisotropy of the particle force and fluid energy analysis, the deformation of the stratum and ground stress field were analyzed. The results show that the stress field will produce a plugging effect at a certain distance from the defect, and the strata exhibit a dominant displacement tendency in the vertical direction, resulting in the emergence of a gradually concave stress relaxation zone and an elliptical contour in the strata displacement map near the defect. The fluid energy describes the displacement of the sand layer very well, and it is separated into the sand layer’s centralized loss region and the major loss area based on the high and low levels of the fluid energy class. The impact of fluid at the defect reaches the maximum kinetic energy, which penetrates the structural weakness and causes the loss of sand particles, and the cross-section of the water influx near the defect gradually expands with the loss of particles, indicating that there is a danger of further expansion of the defect under the impact of water flow. These results have technical implications for the management of water and sand leakage disasters in foundation pit engineering.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Location Overview Reason Picturementioning

confidence: 99%

“…However, there has been a lack of attention given to water and sand leakage in foundation pit engineering. In terms of research on ground settlement due to pit excavation considering hydraulic factors, researchers are currently focusing on the pit dewatering process, with little consideration given to the combined loss of water and sand [16][17][18]. Thus, the hazards of water and sand loss in foundation pits warrant Foshan Metro Line [7] A fan-shaped settlement area with a diameter of about 13 m was formed with a surge point at the center, and the maximum surface settlement was 70 cm after 24 h…”

Section: Location Overview Reason Picturementioning

confidence: 99%

See 2 more Smart Citations

Study on the Mechanism of Water and Sand Leakage in a Foundation Pit Retaining Structure Based on the Computational Fluid Dynamics–Discrete Element Method

Xu,

Zhang,

Wang

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…in stratified soils), which is mostly the case in practical seepage problems. Furthermore, the experimental and numerical studies demonstrated that the pore water pressures obtained from three-dimensional models can be too larger than those obtained from two-dimensional models [6,[11][12][13].…”

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confidence: 99%