Working mechanism of cutoff walls in reducing uplift of large underground structures induced by soil liquefaction

2006 ◽  
Vol 33 (4-5) ◽  
pp. 209-221 ◽  
Author(s):  
Huabei Liu ◽  
Erxiang Song
Keyword(s):  
Soil Liquefaction ◽  
Underground Structures ◽  
Working Mechanism ◽  
Cutoff Walls

scholarly journals PROTECTION EFFECTS OF BURIED STRUCTURES FROM SOIL LIQUEFACTION HAZARD BY MEANS OF CUTOFF WALLS

2006 ◽  
Vol 62 (1) ◽  
pp. 12-21
Author(s):  
Nobuhiko HAMADA ◽  
Shigeru GOTO ◽  
Hideyuki MANO ◽  
Yuzo OHNISHI
Keyword(s):  
Soil Liquefaction ◽  
Buried Structures ◽  
Liquefaction Hazard ◽  
Cutoff Walls

The Uplift Behavior of Large Underground Structures in Liquefied Field

2011 ◽  
Vol 90-93 ◽  
pp. 2112-2118 ◽  
Author(s):  
Xi Wen Zhang ◽  
Xiao Wei Tang ◽  
Qi Shao ◽  
Xu Bai
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Geometrical Nonlinearity ◽  
Soil Layer ◽  
Ground Surface ◽  
Soil Liquefaction ◽  
Underground Structures ◽  
Liquefiable Soil ◽  
The Stability ◽  
Updated Lagrangian

Soil liquefaction due to the earthquake causes serious damages and engineering problems, such as the reduction of the soil strength, large settlement of the ground surface, the flow of liquefied soil and the uplift behavior to the underground structures, and the large deformation induced by the uplift force threatens the stability and safety of the structures. In this paper, a FE-FD coupled method is used in the simulation, the cyclic elasto-plastic constitutive model and the updated lagrangian formulation are applied to deal with the material and geometrical nonlinearity of liquefied soil. The results show that after the earthquake, the exceed pore water pressure will still exist for some time and the structure has an obvious vertical uplift displacement related to the liquefied area and the flow of liquefied soil. The uplift displacement will decrease as the thickness of the upper liquefiable soil layer is reduced. The results can be regarded as a guidance and reference for the design of the large underground structures.

scholarly journals Comparative calculation of piles taking into account seismic impacts (example in Ho Chi Minh City)

2021 ◽  
Vol 263 ◽  
pp. 02021
Author(s):  
Vitalii Sidorov ◽  
Duc Anh Le ◽  
Evgeny Sobolev
Keyword(s):  
Bearing Capacity ◽  
Soil Liquefaction ◽  
Pile Foundations ◽  
Ho Chi Minh City ◽  
Underground Structures ◽  
Normative Documents ◽  
Construction Companies ◽  
International Construction ◽  
Geological Conditions ◽  
Calculation Results

The construction of high-rise building and structures has been widely developed recently in Vietnam. Pile foundations are considered one of the most suitable solutions when choosing the foundations for their construction, especially in difficult geological conditions, including seismic areas. According to many researches, geological conditions of Ho Chi Minh City are generally difficult. The occurrence of earthquakes there influences the conditions for the construction. Besides, many historical cases have shown that soil liquefaction is often manifested, negatively affecting the underground structures and foundation working. With an increase in investments of international construction companies and organizations in Vietnam, pile foundations can be designed according to domestic or foreign normative documents. Therefore, at present, a better understanding and detailed analysis of various existing normative documents and methods for designing pile foundations are required, especially when the influence of soil liquefaction is taken into account. This paper presents a review of various normative documents, including Russian, Vietnamese, American and Eurocode. The different methods in these normative documents for calculating the piles' bearing capacity are considered in 2 cases: with and without taking into account the soil liquefaction based on the hypothesis that the additional downward loads due to self-compaction of liquefiable soils affect piles. Finally, a comparison of the calculation results is presented. The comparison shows how these considering methods in these normative documents differ from each other and how much the pile's bearing capacity can be reduced when considering the soil liquefaction in calculations.

Modelling Of Transport And Capture Of Particles In A Porous Medium

2019 ◽  
pp. 56-60
Keyword(s):  
Porous Medium ◽  
Asymptotic Solution ◽  
Retention Mechanism ◽  
Inverse Filtering ◽  
Underground Structures ◽  
Loose Soil ◽  
Monodisperse Suspension ◽  
Homogeneous Porous Medium ◽  
Model Equations ◽  
Pass Through

The study of the transport and capture of particles moving in a fluid flow in a porous medium is an important problem of underground hydromechanics, which occurs when strengthening loose soil and creating watertight partitions for building tunnels and underground structures. A one-dimensional mathematical model of long-term deep filtration of a monodisperse suspension in a homogeneous porous medium with a dimensional particle retention mechanism is considered. It is assumed that the particles freely pass through large pores and get stuck at the inlet of small pores whose diameter is smaller than the particle size. The model takes into account the change in the permeability of the porous medium and the permissible flow through the pores with increasing concentration of retained particles. A new spatial variable obtained by a special coordinate transformation in model equations is small at any time at each point of the porous medium. A global asymptotic solution of the model equations is constructed by the method of series expansion in a small parameter. The asymptotics found is everywhere close to a numerical solution. Global asymptotic solution can be used to solve the inverse filtering problem and when planning laboratory experiments.

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