Determination of the Influence of the Disturbance Caused by Traversing Cross-Type Deep Foundation Pit Excavations

Wang, Shuhong; Yang, Bo; Dong, Furui; Maxim, Marinichev; Zhang, Ze

doi:10.3390/su15021130

Cited by 3 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Soft soil is generally characterized by a certain structure, high sensitivity, low strength, and low structural strength. After the excavation of foundation pits, perimeter unloading or dynamic loads can reduce the strength of soft soil and increase deformation, which has an adverse efect on the surrounding environment around the pit inversely [12]. To fully investigate the changes in mechanical parameters, such as yield stress, undrained shear strength, compression index, and consolidation coefcient of soft soil in the Kunming area after disturbance, the structural properties of soft soil were analyzed by using the e − log p curve, the e − p curve, and compression index data.…”

Section: Research Methods and Ideasmentioning

confidence: 99%

Study of Structural and Compression Properties of Soft Soils in Kunming at Different Moisture Contents

Guo,

Xu,

Hong

et al. 2023

Shock and Vibration

View full text Add to dashboard Cite

The structure of soil refers to the properties and arrangement of soil particles and pores, as well as their interactions, which have a significant impact on the mechanical behavior of soil. Clarifying the strengths and weaknesses of soil structure can effectively ensure engineering safety during designing. In this study, the structural soft soil in the Wujiaba area of Kunming City was studied. A comprehensive structural parameter γ was proposed by analyzing one-dimensional consolidation test data, which consider both the moisture content and yield stress. Due to its high moisture content and lacustrine features, the soft soil in Kunming possessed obvious structural characteristics. As the moisture content increased, the structural characteristics of the soft soil gradually weakened, making it more prone to compression failure. Moreover, the initial consolidation pressure decreased with the increase in moisture content. And the soft soil was more susceptible to deformation failure with higher moisture content. The conclusions drawn from this study have important implications for predicting the settlement of layered soft soil foundations.

show abstract

Section: Research Methods and Ideasmentioning

confidence: 99%

Study of Structural and Compression Properties of Soft Soils in Kunming at Different Moisture Contents

Guo,

Xu,

Hong

et al. 2023

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Gao et al [13], through analyzing monitoring data from the excavation of an underground diaphragm wall, discovered that the surface settlement around the circular underground diaphragm wall is primarily influenced by the excavation depth. Wang et al [14] found in the analysis of excavation disturbance on a subway crossing with a cross-shaped deep foundation pit that the interaction between the crossshaped intersection structure and the surrounding soil is affected by the repeated unloading disturbance during excavation, soil arching effects, and changes in boundary conditions. The horizontal displacement of the retaining structure and surface settlement differed significantly from the observations of single-pit excavation.…”

Section: Introductionmentioning

confidence: 99%

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Li,

Yi,

et al. 2024

Buildings

View full text Add to dashboard Cite

The intricacies of foundation pit engineering often result in alterations to the surrounding environment, posing potential threats to the safe operation of nearby buildings and pile foundations. This study employs finite element numerical simulation to scrutinize the influence of vacuum preloading pressure, preloading duration, excavation slope ratio, excavation duration, and retaining pile wall depth on the stress and deformation of existing plain concrete pile foundations. The findings reveal that the impacts of excavation are primarily absorbed by both proximal and distal piles in relation to the pit. Moreover, elevating vacuum preloading pressure and extending the preloading duration during dewatering can lead to increased internal forces and displacement of the piles. Changes in excavation slope ratio exhibit minimal effects, while prolonged excavation duration can shift internal forces from predominantly positive to negative, with negligible impact on horizontal displacement. Importantly, augmenting the depth of the retaining pile wall embedding effectively mitigates the effects of pit excavation.

show abstract

Study of the Mechanical Behavior of Retaining Structures and Adjacent Buildings during the Excavation of Deep and Long Pits

Wang,

Zhang

et al. 2024

Shock and Vibration

View full text Add to dashboard Cite

Excavation of deep and long pits can cause strata deformation and settlement of adjacent buildings. The excavation of a deep foundation pit of a nearby building in Zhengzhou City, China, is taken as the research object. The foundation of the foundation pit is an independent foundation under the column, the depth of the foundation pit is 24.5∼26.3 m, and the support form of an underground continuous wall and four internal supports is adopted. The stress and deformation characteristics of retaining structures during the construction of deep and long pits and their impact on the deformation of nearby buildings were studied through on‐site monitoring and finite element simulation. The analysis focuses on the effects of different excavation stages on adjacent structures, with the main conclusions as follows. After excavation, the underground continuous wall far from the building undergoes a “rotating‐kick” displacement, while the underground continuous wall on the side near the building only shows a “kick” displacement. Adjacent buildings have little influence on the distribution of shear force and bending moment of the underground continuous wall of the foundation pit. The first horizontal strut experiences pressure, gradually shifting to tension as excavation continues, with the maximum stress reaching 3.6 × 103 kN. The second, third, and fourth horizontal struts mainly bear compressive forces, increasing with the depth of the struts. The building primarily undergoes settlement in the early stages of deep and long pit excavation. As the excavation progresses, the building points near the pit begin to bulge, but the building corners far from the pit continue to show settlement. During the excavation of the deep and long pit, the differential settlement of the long side of the nearby building first decreases and then increases, and the differential settlement of the short side changes from a slight decrease to a significant increase. The settlement evolution of the building is as follows: overall settlement ⟶ overall uplift ⟶ uplift of the side of the building near the pit ⟶ outward tilting away from the pit. The findings may provide references for designing, constructing, and operating deep and large foundation pits.

show abstract

Determination of the Influence of the Disturbance Caused by Traversing Cross-Type Deep Foundation Pit Excavations

Cited by 3 publications

References 22 publications

Study of Structural and Compression Properties of Soft Soils in Kunming at Different Moisture Contents

Study of Structural and Compression Properties of Soft Soils in Kunming at Different Moisture Contents

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Study of the Mechanical Behavior of Retaining Structures and Adjacent Buildings during the Excavation of Deep and Long Pits

Contact Info

Product

Resources

About