Abstract
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.
Highlights
The construction of high-rise buildings and structures has been widely developed in the world
One of the most suitable solutions when choosing the type of foundations for the construction of heavy buildings and structures is a pile foundation
Only the calculation of friction piles by bearing capacity is considered. This calculation will be carried out using engineering methods set out in various existing normative documents, including Russian [15,16], Vietnamese [17,18], American standards [19] and Eurocode [20-22], in 2 design cases: with and without taking into account the influence of soil liquefaction
Summary
The construction of high-rise buildings and structures has been widely developed in the world. In Vietnam, a qualitative analysis and selection of the type of foundations for those buildings and structures are required, ensuring operational reliability and cost-effectiveness. Geotechnical conditions in Vietnam are generally difficult, including in Ho Chi Minh City. According to a lot of researches, the territory of Ho Chi Minh City is covered with a variety of weak soils, such as fluid-plastic silts and clays. Under the influence of a weak seismic effect on the base and foundations, the destruction of buildings and structures is possible. It is necessary to consider the effects of seismic loads and secondary processes after earthquakes when designing pile foundations
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