Experimental investigations on a deep excavation support system with adjustable strut length

2021 ◽  
Vol 115 ◽  
pp. 104046
Author(s):  
Baoguo Chen ◽  
Tengfei Yan ◽  
Dingbao Song ◽  
Ruiping Luo ◽  
Guanghui Zhang
Keyword(s):  
Support System ◽  
Experimental Investigations ◽  
Deep Excavation ◽  
Excavation Support

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.

Cause investigation of large deformation of a deep excavation support system subjected to unsymmetrical surface loading

2020 ◽  
Vol 107 ◽  
pp. 104202 ◽  
Author(s):  
Xuefeng Ou ◽  
Xuemin Zhang ◽  
Jinyang Fu ◽  
Cong Zhang ◽  
Xianshun Zhou ◽  
...  
Keyword(s):  
Large Deformation ◽  
Support System ◽  
Deep Excavation ◽  
Surface Loading ◽  
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.

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