Numerical Analysis of the Shorings of Deep Foundation Pits with Regard for the Soil Solidification

Gotman, A. L.; Gotman, Yu. A.

doi:10.1007/s11204-019-09595-6

Cited by 8 publications

(4 citation statements)

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“…During the municipal construction projects, foundation pit engineering is of great importance in the field of geotechnical engineering [1]. e enclosure system of a foundation pit has a small safety reserve, and the design and construction of the pit are closely related to the surrounding environment [2], which make the foundation pit engineering has its special characteristics such as high risk and individuality [3], especially for the excavation of deep foundation pits [4]. Owing to the high risk and high difficulty of the excavation process, deep foundation pits often pose great safety hazards to people such as the collapse of the deep foundation pit in the Xianghu station of the Hangzhou subway.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Wei

Zhou

Yin-Feng

et al. 2020

Mathematical Problems in Engineering

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A deep foundation pit in a station of the Hangzhou subway is adjacent to new high-rise residential buildings on the north side and to the Evergrande foundation pit being excavated on the south side. This work considers the excavation of the foundation pit in the subway station as the research subject, focuses on the difference of the deformation and Earth pressure between the north side and the south side of the foundation pit under these special working conditions through the analysis of the measured data, and compares it with an ordinary foundation pit. Analyzing the measured data reveals that the horizontal displacement of the retaining wall and the ground settlement are far larger on the north side than on the south side, and both often exceed the deformation alarm value; the deformation of the ordinary foundation pit is between the deformation of the overloaded (north) side and that of the unloaded (south) side of the foundation pit. Moreover, the maximum rate of the horizontal creep of the soil and the maximum rate of the creep caused by the ground settlement on the north side of the foundation pit are larger than those on the south side of the foundation pit; the maximum rate of the horizontal creep of the ordinary foundation pit is between the two. The active Earth pressure on the pit wall on the north side is higher than that on the south side of the foundation pit, and because of the surrounding unloading, passive Earth pressure is generated at the bottom of the pit wall on the south side of the foundation pit, which causes it to shift to the outside of the foundation pit. The settlement of the surrounding high-rise buildings and the settlement of the columns are all within the range of the alarm values; also, the buildings settle evenly. Due to the excavation and unloading on the south side of the foundation pit, the uplift of the columns is not considerable.

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Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Wei

Zhou

Yin-Feng

et al. 2020

Mathematical Problems in Engineering

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“…At present, the support structure forms of foundation pits in different cities are also different due to the different geological conditions, hydrogeological conditions, and environment of foundation pits in different cities [6][7][8][9]. The research on the excavation process of foundation pit can clarify the change law between the displacement of support structure, groundwater level and surface settlement, and the excavation depth of foundation pit.…”

Section: Introductionmentioning

confidence: 99%

Risk Reduction Measures and Monitoring Analysis of Deep Foundation Pit with Water in a Metro Station in Hefei

Wang,

Ye,

Zhang

2023

Water

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The construction of an urban metro will inevitably involve deep excavation. Risk assessment before deep excavation, risk reduction measures, and real-time monitoring during excavation can effectively ensure the safety of deep excavation. Taking the deep excavation pit of Lingbi Road Station of Hefei Rail Transit Line 8 as the research object, this paper first analyses and evaluates the self-risk, groundwater risk, and surrounding environmental risk of the deep excavation pit, and gives the corresponding measures to reduce the risk of the deep excavation pit. Then, the monitoring content of the excavation process is determined according to the environment of the excavation, the hydrogeological conditions, and the type of supporting structure, and the monitoring scheme is designed. Finally, the entire excavation process is monitored in real time. By analyzing the monitoring data of 13 projects, such as horizontal displacement of the wall top, axial support force, groundwater level, etc., it is found that the monitoring values of 13 projects do not exceed the control value. This proves that the composite internal bracing structure of the underground diaphragm wall is suitable for deep foundation pit support in the Hefei area, as the selection of the water-bearing deep foundation pit support structure, the value of the support structure parameters, and the design of the foundation pit dewatering scheme are all reasonable. The study of this paper also serves as a case reference for the support design of water-bearing deep excavation of subway station in Hefei area.

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“…These methods have different advantages and disadvantages. A pit is modeled in numerical simulations based on the observed parameters, but the anisotropy of the rock and soil masses, as well as their modes of connection, are idealized [6][7][8]. Lab-scale geophysical model tests avoid such simplification of the rock and soil masses, can be used to analyze trends and obtain other qualitative conclusions, and have a high reference value.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Deformation and Stability of Ultra-Deep Pit in Plateau Alluvial–Lacustrine Gravel Strata

Guo,

Liu

2024

Processes

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Deformation of ultra-deep pit walls and surrounding geotechnical bodies due to engineering disturbances typically shows intricate spatiotemporal patterns. In this study, deformations at critical steps of the construction process were first numerically simulated by Midas GTS NX, and this was followed by lab-scale geophysical model tests of the entire process of the pit construction. Data on deformation obtained from numerical simulations and lab-scale geophysical model tests were compared with those obtained from a dynamic monitoring scheme in the field to analyze the characteristics of the deformation and evolution of the pit wall. This was used to derive a generally applicable theoretical expression to predict variations in the horizontal displacements.

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Numerical Analysis of the Shorings of Deep Foundation Pits with Regard for the Soil Solidification

Cited by 8 publications

References 0 publications

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Deformation Behavior of Deep Foundation Pit under Both Overloading and Unloading Conditions

Risk Reduction Measures and Monitoring Analysis of Deep Foundation Pit with Water in a Metro Station in Hefei

Characteristics of Deformation and Stability of Ultra-Deep Pit in Plateau Alluvial–Lacustrine Gravel Strata

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