Predicting Ground Surface Settlements Induced by Deep Excavation under Embankment Surcharge Load in Flood Detention Zone

Abstract

In this paper, a simplified prediction formula of ground settlement induced by deep foundation pit excavation is proposed, especially suitable for ground overloading near a foundation pit, such as embankment surcharge load, which is carefully considered via the means of load equivalence. The ground settlement induced by foundation pit excavation and embankment surcharge load is determined by the modified skewness prediction formula and the simplified Boussinesq solution, respectively, and it is assumed that no coupling effect exists between the two settlement sources. In addition, this paper improves the determination of the maximum settlement location by combining calculus and curve fitting, replacing the existing prediction formula which relies heavily on engineering experience to determine the maximum settlement point. The predicted value obtained using this method comes close to the measured value, and the deviation of the maximum surface settlement value is controlled within about 5% in the three cases introduced, of which the accuracy is higher than the existing prediction formula.

Stability Analysis of Super-Large Special-Shaped Deep Excavation in Coastal Water-Rich Region Considering Spatial Variability of Ground Parameters

“…This causes the soil outside the pit to protrude, and the horizontal displacement rebounds towards the outside of the pit, stabilizing to a position of 1.5-2.5 mm. This is also reflected in reference [34].…”

Flow Pattern and Escape Hazards of People from Flood Intrusion into the Staircase of Underground Spaces with Multiple Rest Platforms

“…Considering that the entrance and exit platforms of subway stations are elevated above ground level, Jiang [28] derived the relationship between the flood height h 0 and the unit width flow q, based on the measurement results of the flow rate in indoor experiments of flooded staircases at different heights (Equation ( 9)), as follows: q = 1.417h 0 1.5 (9) In this paper, according to the relationship between unit width flow and inlet velocity, the relationship between inlet velocity v 0 and flood height h 0 (Equation ( 10)) was obtained with reference to Equation ( 9), and the liquid-phase inlet velocity v 0 boundary condition of the model was set accordingly, as follows: (10) Jiang [28] and Hou, Chen [30] conducted a grid independence verification for the calculation of the staircase water flow model and analyzed the effect of grid size on the accuracy of simulation results, finding that setting the maximum grid size to 10 mm can best satisfy the computational accuracy and computational cost. In this paper, the computational domain was meshed using a quadrilateral structured grid, and the maximum grid size was set to 10 mm (Figure 4).…”

“…The risk of flooding in cities is rapidly increasing with climate deterioration and rapid urbanization [3][4][5][6]. Urban flooding has become a prominent problem in many countries and regions [7][8][9][10]. For example, China's urban flooding disaster in 2021 caused 59.01 million people to be affected [11].…”

Prediction of Buildings’ Settlements Induced by Deep Foundation Pit Construction Based on LSTM-RA-ANN

“…At present, the number of foundation pits is increasing, and most of them are found in the busy areas of cities. The stability of the pit excavation itself and its potential impact on the surrounding buildings and structures have become a primary consideration in engineering construction [1]. A large number of studies have been carried out on the impact of pit construction on the settlement of surrounding buildings, and the commonly used methods include regression analysis, grey theory, time-series analysis, neural network analysis, and other [2] methods.…”