A simplified method for predicting ground settlement profiles induced by excavation in soft clay

Ou, Chang‐Yu; Hsieh, Pio-Go

doi:10.1016/j.compgeo.2011.06.008

Cited by 78 publications

(33 citation statements)

References 14 publications

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“…Clough and O'Rourke (1990) developed the ground settlement envelopes with an empirical method. Based on FEM analysis, Ou and Hsieh (2011) proposed a simple method to predict the settlement influence zone. They found that the excavation depth, the excavation width, the thickness of soft clay and the depth of rock-like soil were related to the width of ground settlement zone.…”

Section: Introductionmentioning

confidence: 99%

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Study on Deformation Due to Deep Excavation Based on Monitoring Data in Soft Soil Area in Shanghai

Zhai

Jia

Xie

2014

Tunneling and Underground Construction

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In this paper, based on monitoring data from 18 deep excavation cases in soft soil area in Shanghai, the depth of basal heave (H R ), the width of settlement zone (B s ), the maximum ground settlement (δ vm ) and lateral deflection of retaining wall (δ hm ) are studied. First, it is found that H R is the depth where the unloading ratio is 0.15. Second, B s is found to be closely related to the volume of excavation and the depth of basal heave. Then two simple methods are proposed for the prediction of B s . At last, the relation between maximum deformation and construction time is studied. And the objective construction time is suggested.

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Section: Introductionmentioning

confidence: 99%

“…Referring to the study of Ou and Hsieh (2011), the end of primary settlement zone could be defined as the location where δ v /δ vm ≤0.16. Therefore, B s is the location where δ v ≤10mm and δ v /δ vm ≤0.16.…”

mentioning

confidence: 99%

Study on Deformation Due to Deep Excavation Based on Monitoring Data in Soft Soil Area in Shanghai

Zhai

Jia

Xie

2014

Tunneling and Underground Construction

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“…us, different prediction methods and theories have been proposed [5][6][7][8]. In 1969, Peck proposed a method of estimating the surface subsidence in relation to the soil properties and excavation depth using engineering measurements.…”

Section: Introductionmentioning

confidence: 99%

Surface Settlement Damage Model of Pile‐Anchor Supporting Structure in Deep Excavation

Zhang

Jiang

et al. 2020

Advances in Civil Engineering

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In damage mechanics, the deep excavation of soil is a process of damage development, and soil failure can be considered a process of continuously transforming undisturbed soil to damaged soil. Therefore, this study considered the occurrence of soil damage during the pit excavation, established a soil damage model, damage evolution equation, and soil damage constitutive relationship, and then deduced a calculate model of the pile displacement under the consideration of soil damage. Based on the principle of the stratum loss method, the surface settlement around a deep excavated pit was assumed as a skewed distribution curve, and the surface settlement of the pile-anchor supporting pit was solved. Based on this established method, finite element analysis software was used to calculate the surface subsidence for a field case, and the numerical results were compared with monitoring data in the field. The results revealed that, to a certain extent, soil damage affected the distribution of surface settlement in excavated pits. With the development of soil damage, the mechanical properties of soil gradually decreased, which led to increased surface settlement and changes in the direction of the excavation pit. Because soil damage is an important factor causing surface settlement, it is meaningful to consider soil damage when calculating the surface settlement in the deep excavation of pits.

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“…Generally, soil excavation causes the release of in situ stress and thus soil displacement [1][2][3][4][5], which inevitably exerts influence on existing structures. To better understand the influence of adjacent excavation on existing structures and deformation induced by the excavation of foundation pit, theoretical analysis, numerical analysis, and modelling tests have been conducted by many investigators [6][7][8][9][10]. For the prominent regional characteristics of foundation pit engineering, the general regularities of foundation pit deformation in different areas were proposed.…”

Section: Introductionmentioning

confidence: 99%

A Case Study on Field Monitoring Analysis of Deep Foundation Pit in Soft Soils

Zhang

Han

2019

Advances in Civil Engineering

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Field monitoring in the process of excavation of foundation pit is an important measure to reduce the risk. This paper describes a case study of the filed monitoring data during the process of deep foundation pit excavation in soft soil areas. The displacements of the diaphragm wall top were analysed and found that the horizontal displacement showed the convex shape, while the vertical displacement showed the concave shape. Based on the field monitoring data, the deformation mode of lateral displacement of the diaphragm wall belonged to the composite mode. The relationship between maximum lateral displacement and excavation depth showed a strong linear correlation. The horizontal displacements of bracing pillar decreased with the increasing of bracing stiffness, while the effect of bracing stiffness on vertical displacements of bracing pillar could be ignored. The settlement profile computed using the method of Hsieh and Ou was in good agreement with the field observations and better described the development trend of the ground surface settlement. The ratio of the maximum ground surface settlement (δvm) to the maximum lateral displacement of the diaphragm wall (δhm) was in the range of 0.74∼0.88, belonging to the range of 0.5∼1.0 proposed by Hsieh and Ou. This paper provides a reference basis and related guidance for similar projects.

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A simplified method for predicting ground settlement profiles induced by excavation in soft clay

Cited by 78 publications

References 14 publications

Study on Deformation Due to Deep Excavation Based on Monitoring Data in Soft Soil Area in Shanghai

Study on Deformation Due to Deep Excavation Based on Monitoring Data in Soft Soil Area in Shanghai

Surface Settlement Damage Model of Pile‐Anchor Supporting Structure in Deep Excavation

A Case Study on Field Monitoring Analysis of Deep Foundation Pit in Soft Soils

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