vertical ground movement

2014 ◽  
pp. 1483-1483
Keyword(s):  
Ground Movement ◽  
Vertical Ground

scholarly journals Ground Movement Analysis Based on Stochastic Medium Theory

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Meng Fei ◽  
Wu Li-chun ◽  
Zhang Jia-sheng ◽  
Deng Guo-dong ◽  
Ni Zhi-hui
Keyword(s):  
Distribution Function ◽  
Back Analysis ◽  
Movement Analysis ◽  
Measured Data ◽  
Ground Movement ◽  
Pile Driving ◽  
Normal Distribution Function ◽  
Stochastic Medium ◽  
Medium Theory ◽  
Vertical Ground

In order to calculate the ground movement induced by displacement piles driven into horizontal layered strata, an axisymmetric model was built and then the vertical and horizontal ground movement functions were deduced using stochastic medium theory. Results show that the vertical ground movement obeys normal distribution function, while the horizontal ground movement is an exponential function. Utilizing field measured data, parameters of these functions can be obtained by back analysis, and an example was employed to verify this model. Result shows that stochastic medium theory is suitable for calculating the ground movement in pile driving, and there is no need to consider the constitutive model of soil or contact between pile and soil. This method is applicable in practice.

Analysis of Ground Movement in Pile Driving Based on Stochastic Medium Theory

2013 ◽  
Vol 438-439 ◽  
pp. 1404-1408 ◽  
Author(s):  
Fei Meng ◽  
Jia Sheng Zhang ◽  
Hui Ying Liu
Keyword(s):  
Axisymmetric Problem ◽  
Back Analysis ◽  
Measured Data ◽  
Ground Movement ◽  
Pile Driving ◽  
Normal Distribution Function ◽  
Stochastic Medium ◽  
Medium Theory ◽  
Vertical Ground ◽  
Soil Interface

In order to calculate the ground movement induced by displacement piles driven into horizontal layered soil, it is simplified to an axisymmetric problem. Then the vertical and horizontal ground movement functions were deduced based on stochastic medium theory. The vertical ground movement is a normal distribution function, while the horizontal ground movement is an exponential function. Utilizing field measured data, parameters of these functions can be obtained by back analysis. The example indicates that the stochastic medium theory is suitable for calculating the ground movement in pile driving, and there is no need to consider the constitutive model of soil or contact model of pile-soil interface in calculation. This method is fairly applicable in practice, and can provide a reference for related research.

Numerical modelling of vertical ground movements in expansive, soils

1991 ◽  
Vol 28 (2) ◽  
pp. 189-199 ◽  
Author(s):  
P. J. Sattler ◽  
D. G. Fredlund
Keyword(s):  
Boundary Condition ◽  
Numerical Model ◽  
Potential Evapotranspiration ◽  
Surface Flux ◽  
Matric Suction ◽  
Ground Movement ◽  
Soil Parameters ◽  
Flux Boundary Condition ◽  
Ground Movements ◽  
Vertical Ground

A numerical model was developed to relate matric suction changes and vertical ground movements. The research considers one-dimensional vertical ground movements under open-vegetated fields subject to changing climatic conditions. A percentage of the Thornthwaite potential evapotranspiration model proved to be adequate to characterize the surface flux boundary condition. The infiltration and exfiltration processes were modelled separately for the field conditions. During infiltration, shrinkage cracks and the macrostructure of the soils dominate behavior. During this process, bulk permeabilities in the order of 10−6–10−8 m/s were required to simulate measured ground movements. Exfiltration processes are dominated by flow in the vapour phase as drying occurs in the soil. Bulk permeabilities in the order of 10−9–10−11 m/s were required to simulate the measured ground movement. The simulations of ground movements would also indicate that thermally induced suctions (i.e., winter freezing conditions) could account for a significant portion of the seasonal vertical ground movements. The numerical model can also be used to predict seasonal ground movements beneath light engineered structures. Further research, however, is required to better understand how to establish the surface flux boundary condition. As well, there is need for more case histories to enlarge the database of unsaturated soil parameters. Key words: vertical ground movement, matric suction, modelling, evapotranspiration, field permeabilities.

scholarly journals Mindlin solution on ground deformation caused by the trench excavation during installation of concrete diaphragm wall panels

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Guichun Zhu
Keyword(s):  
Urban Areas ◽  
Integral Transformation ◽  
Ground Deformation ◽  
Ground Movement ◽  
Sensitivity Analyses ◽  
Engineering Practice ◽  
Measurement Sensitivity ◽  
Vertical Ground ◽  
The Impact ◽  
Trench Excavation

AbstractConcrete diaphragm walls (CDWs) are widely used as support of deep excavation in soft ground in urban areas. Ground deformation occurs during the excavation of trenches for the installation of the CDW panels due to ground stress release. This paper investigates the ground deformation during slurry trenching using Mindlin solution. The pressure of slurry used to protect the trench stability during excavation is simulated as a triangularly distributed load on the trench walls, the soil stress state is solved using Mindlin solution, and the horizontal and vertical ground displacement are obtained through integral transformation of ground strain. The rationality of the solution is verified through comparison between the analytical solution and field measurement. Sensitivity analyses are performed on soil elastic modulus, Poisson's ratio, trench excavation depth and panel length. Simplified formulation is proposed for the prediction of horizontal ground deformation. The impact of excavation stages and adjacent panels on the ground deformation is explored. The study finds that the Mindlin solution is able to provide an approximate solution on the ground deformation during slurry trenching, and the simplified formulation can be used to provide a fast estimate of the horizontal ground movement in engineering practice.

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