Second Avenue Subway Project: Deep Excavation Support of a Cut-and-Cover Station

2016 ◽  
Author(s):  
R. Grigson ◽  
C. Ho ◽  
P. LeMus
Keyword(s):  
Deep Excavation ◽  
Excavation Support

scholarly journals Forecasting the impact of buildings with multi-storey underground parts on the displacement of subsoil using modern numerical tools

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hanna Michalak ◽  
Paweł Przybysz
Keyword(s):  
Numerical Modelling ◽  
Numerical Models ◽  
Deep Excavation ◽  
Design And Implementation ◽  
Numerical Tools ◽  
Excavation Support ◽  
Area Of Influence ◽  
The Impact ◽  
New Buildings ◽  
Ground Part

Abstract The paper will analyse and review the experience to date in determining the impact range of implementation of deeply founded structures on the displacement of the subsoil in the vicinity. With the background of these experiences, primarily empirical, the present possibilities of using numerical modelling to forecast the displacements of the terrain surface in various stages of works, that is, execution of deep excavation support systems, excavation-deepening phases with successive adding of struts, construction of underground levels and erection of the above-ground part of the building, will be presented. Based on the results of own research, conclusions on the use of 3D numerical models in spatial shaping and designing the structure of underground parts of new buildings erected in dense urban development will be presented. The characterised 3D numerical models were verified, taking into account the actual results of geodetic measurements of the completed buildings. Determining the range and forecasting the displacements of the subsoil are necessary for the design and implementation of investments due to the need to ensure the safety of erection and use of a new building and the buildings located within the area of influence.

scholarly journals DISPLACEMENT MONITORING AND SENSITIVITY ANALYSIS IN THE OBSERVATIONAL METHOD

2013 ◽  
Vol 35 (3) ◽  
pp. 25-43 ◽  
Author(s):  
Karolina Górska ◽  
Zbigniew Muszyński ◽  
Jarosław Rybak
Keyword(s):  
Sensitivity Analysis ◽  
Computational Model ◽  
Cohesive Soil ◽  
Calculation Model ◽  
Observational Method ◽  
Deep Excavation ◽  
Sheet Pile ◽  
Displacement Monitoring ◽  
Excavation Support ◽  
Construction Works

Abstract This work discusses the fundamentals of designing deep excavation support by means of observational method. The effective tools for optimum designing with the use of the observational method are both inclinometric and geodetic monitoring, which provide data for the systematically updated calibration of the numerical computational model. The analysis included methods for selecting data for the design (by choosing the basic random variables), as well as methods for an on-going verification of the results of numeric calculations (e.g., MES) by way of measuring the structure displacement using geodetic and inclinometric techniques. The presented example shows the sensitivity analysis of the calculation model for a cantilever wall in non-cohesive soil; that analysis makes it possible to select the data to be later subject to calibration. The paper presents the results of measurements of a sheet pile wall displacement, carried out by means of inclinometric method and, simultaneously, two geodetic methods, successively with the deepening of the excavation. This work includes also critical comments regarding the usefulness of the obtained data, as well as practical aspects of taking measurement in the conditions of on-going construction works.

Displacement Prediction for Soil Nailing Based on ANN

2013 ◽  
Vol 353-356 ◽  
pp. 614-618
Author(s):  
Lang Gao ◽  
Zhao Wen Tang ◽  
Quan Zhong Liu
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Soil Nailing ◽  
Deep Excavation ◽  
Engineering Project ◽  
Deformation Prediction ◽  
Displacement Prediction ◽  
Artificial Neural ◽  
Excavation Support ◽  
Artificial Neural Network Ann

Soil nailing has become an important excavation support system for its good performance and cost-effectiveness. It is complicated to predict deformation of soil nailing during excavating. The Artificial Neural Network (ANN) is developed very quickly these years, which can be applied in diverse applications such as complex non-linear function mapping, pattern recognition, image processing and so on, and has been widely used in many fields, including geotechnical engineering. In this paper, the artificial neural network is applied for deformation prediction for soil nailing in deep excavation. The time series neural networks-based model for predicting deformation is presented and used in an engineering project. The results predicted by the model and those observed in the field are compared. It is shown that the artificial neural network-based method is effective in predicting the displacement of soil nailing during excavation.

Distributions of ground movements parallel to deep excavations in clay

2006 ◽  
Vol 43 (1) ◽  
pp. 43-58 ◽  
Author(s):  
Jill Roboski ◽  
Richard J Finno
Keyword(s):  
Error Function ◽  
Ground Movement ◽  
Deep Excavation ◽  
Direction Parallel ◽  
Ground Movements ◽  
Movement Data ◽  
Empirical Procedure ◽  
Complementary Error Function ◽  
Excavation Support ◽  
Support Wall

An empirical procedure for fitting a complementary error function (erfc) to settlement and lateral ground movement data in a direction parallel to an excavation support wall is proposed based on extensive optical survey data obtained around a 12.8 m deep excavation in Chicago. The maximum ground movement and the height and length of an excavation wall define the erfc fitting function. The erfc fit is shown to apply to three other excavation projects where substantial ground movement data were reported.Key words: excavations, clays, ground movements, performance data.

DEVELOPMENT OF DESIGN METHOD FOR INCLINED BRACELESS EXCAVATION SUPPORT APPLICABLE TO DEEP EXCAVATION

2021 ◽  
Vol 77 (1) ◽  
pp. 1-17
Author(s):  
Tomonari MAEDA ◽  
Yoichi SHIMADA ◽  
Shinichi TAKAHASHI ◽  
Shigehiko SUGIE ◽  
Junichi KOSEKI
Keyword(s):  
Design Method ◽  
Deep Excavation ◽  
Excavation Support

Analysis of cement-treated soil slab for deep excavation support – a rational approach

Géotechnique ◽  
2019 ◽  
Vol 69 (10) ◽  
pp. 888-905 ◽  
Author(s):  
Yutao Pan ◽  
Yong Liu ◽  
Fook Hou Lee ◽  
Kok Kwang Phoon
Keyword(s):  
Rational Approach ◽  
Deep Excavation ◽  
Treated Soil ◽  
Excavation Support

The Spring Rigidity Values Analysis in Incremental Method of Deep Excavation with Considering Interaction among Soil Springs

2010 ◽  
Vol 168-170 ◽  
pp. 312-318
Author(s):  
Cun En Chen ◽  
Chun Bao He
Keyword(s):  
Active Region ◽  
Theoretical Analysis ◽  
Calculation Result ◽  
Deep Excavation ◽  
Passive Region ◽  
Incremental Method ◽  
Foundation Model ◽  
Foundation Deformation ◽  
Excavation Support ◽  
Spring Rigidity

Based on the theory of interaction between deep excavation support structure and subsoil, the influencing coefficient is presented in this paper in the condition of different foundation model. The calculation result shows that the foundation deformation considering interaction among soil springs is large than those not considering the interaction, and also larger than engineering practical condition. Theoretical analysis indicates the stiffness change of soil spring is related to spring rigidity in both active region and passive region when it is calculated by incremental method. The example proves that the method presented in this paper has good preciseness comparing with the results of engineering practical condition. So the theory of incremental method of deep excavation considering interaction is consummated.

scholarly journals Alüviyal Ortamda Derin Kazı Problemi

2019 ◽  
Vol 2 (3) ◽  
pp. 1369-1376
Author(s):  
Aşkın Ozocak ◽  
Sedat Sert ◽  
Ertan Bol
Keyword(s):  
Support System ◽  
Deep Excavation ◽  
City Center ◽  
Short Term ◽  
Filling Phase ◽  
Eastern Border ◽  
Measured Deformation ◽  
Excavation Support ◽  
The City

The basement needs that emerged in the city centers have led to a more frequent encounter with deep excavation problems, which is one of the important issues of Geotechnical Engineering. This situation requires additional care and experience for soil and rock environments especially in deep excavations where different shear resistance parameters can be mobilized both in the short term and in the long term. In this paper, the stages of soil investigation, analysis, manufacturing and measured deformation were evaluated within the scope of the deep excavation planned and carried out in Adapazari city center. Following the excavation and filling phase at a depth of 4 m following the construction of the secant piles, the deformation readings were particularly noticeable on the eastern border. SAU Geotechnical Working Group conducted an investigation study to understand the causes of the incident and to take the necessary measures, if any. After the investigation, the reason of the deformations was estimated to be due to the sudden drainage of groundwater during the construction of the piles, and subsequent consolidation of the clayey layers beneath the existing 5-storey structure adjacent to it. The excavation has been successfully completed with the projected horizontal support system and it has been observed that the application of strut in the deep excavation support system creates practical difficulties especially in small parcels during the excavation phase.

scholarly journals General deformation behavior of deep excavation support systems: A review

2022 ◽  
Vol 10 (1) ◽  
pp. 039-057
Author(s):  
Maher T. El-Nimr ◽  
Ali M. Basha ◽  
Mohamed M. Abo-Raya ◽  
Mohamed H. Zakaria
Keyword(s):  
Literature Review ◽  
Deformation Behavior ◽  
Support Systems ◽  
Mean Value ◽  
Clay Soils ◽  
Deep Excavation ◽  
Influence Zone ◽  
Stiff Clay ◽  
General Deformation ◽  
Excavation Support

In geotechnical engineering, ground movement caused by excavations is a challenging issue. The excessive differential settlement generated by soil movement induced by wall deflection may cause damage to nearby structures. A detailed literature review on the general deformation behavior of deep excavation support systems is presented in this paper. Many factors, such as normalized horizontal deflection (δh-max/He%), vertical displacement (δv-max/He%), δvmax/δhmax ratio, settlement influence zone (Do), etc., can play significant roles in describing the deflection behavior of the excavation system. A descriptive analysis of the reviewed data was carried out. The concluded δh-max/He% values range between 0.17 to 1.5, with a mean value of 0.58 for soft clay, while in the case of sands and stiff clay soils δh-max/He% value ranges between 0.07 to 0.40, with a mean value of 0.20. δv-max/He% values range between 0.13 to 1.10, with a mean value of 0.49 for soft soil, while its value ranges between 0.02 to 1.10, with a mean value of 0.24 in the case of sands and stiff clay soils. The settlement influence zone (Do) reaches a mean distance of 2.3He, which falls within Do=1.5-3.5He in the case of soft clays, while Do reaches a mean distance of 2.0He and 3.0He in the case of sands and other stiff clay soils, respectively. The relationship between system stiffness and excavation-induced wall and ground movements was discussed. Unfortunately, the literature review offers limited data regarding system stiffness, the 3-D nature of excavation support systems, excavation processes, and time effects.

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