Local site effect on seismic hazard of the relocated new Balakot town

Kazemzad, Mahmood; Zamin, Bakht; Iqbal, Shahid; Rehman, Zia ur; Afzal, Saima; Safdar, Muhammad; Iqbal, Qaiser; Ali, Arshad

doi:10.1016/j.soildyn.2022.107451

Cited by 8 publications

(2 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The upper surface of the cell is free from fixities and loads, and the pile is considered rigid and non-deformable. The cell medium is elastic and has the following mechanical characteristics: modulus of elasticity E and Poisson's coefficient ν (the alternatives are shear modulus G and bulk modulus K) [45]. A cylindrical coordinate system with the origin in the center of the top surface of the cell, the top-to-bottom direction of the z-axis, and the radial direction of the r-axis are adopted for the mathematical description.…”

Section: Methodsmentioning

confidence: 99%

Mathematical Analysis of the Vibratory Pile Driving Rate

Ter-Martirosyan

Shebunyaev

Sidorov

2023

Axioms

View full text Add to dashboard Cite

Vibratory piling technology does not require analytical tools to predict displacement rates and arising forces. The authors consider the problem of vibratory driving of a pile into a homogeneous unsaturated sandy massif under the action of static and dynamic loads. The purpose of this study is to develop a new analytical solution to the problem of the vibratory pile driving rate in a homogeneous sand base taking vibration creep into account. The solution is provided for the quasi-dynamic problem statement (inertial terms in equations of motion are neglected): the sand medium develops viscous properties due to vibration under the action of the dynamic component of the load, and a pile is driven into the viscous sand base due to the static component of the vertical load. The obtained mathematical model converges with the results of laboratory flume and field experiments performed by other researchers earlier, where the pile vibratory embedding rate increased along with an increase in static loading, the amplitude of dynamic load, and vibration frequency. It can be used to predict the pile or sheet pile driving rate into the unsaturated sand base under the action of vibration, and also to evaluate the necessary parameters of pile driving to obtain the required value of the pile embedding rate.

show abstract

Section: Methodsmentioning

confidence: 99%

Mathematical Analysis of the Vibratory Pile Driving Rate

Ter-Martirosyan

Shebunyaev

Sidorov

2023

Axioms

View full text Add to dashboard Cite

show abstract

“…Vertical forces reduce the effective normal pressure on sliding surfaces, while much stronger horizontal forces play a decisive role in slope stability. Moreover, because during an earthquake the seismic action can have any direction, as a rule, in calculations the horizontal component is considered, this being the most unfavorable case in terms of the effect on the stability of the slopes [25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Reassessment of the Stability Conditions in the Lignite Open Pits of Oltenia (Romania) in Relation to the New Local Seismic Context as an Imperative for Sustainable Mining

Faur,

Apostu,

Lazăr

2024

Sustainability

View full text Add to dashboard Cite

Responsible mining considers the three pillars of sustainability, namely the environment, the economy and social welfare. As a result, exploitation of deposits of useful mineral substances, as an economic activity, must be carried out taking into account several requirements, among which is the generation of a reduced impact on the environment and local communities. Sliding of open pits and waste dumps slopes represents a major risk, which endangers workers and machinery, as well as the components of the natural and built environment in the influenced area. In order to avoid such phenomena and their consequences, it is imperative to analyze the stability conditions whenever their possible triggering factors appear (such as earthquakes). Between February and March of 2023, the region of Oltenia (south-west Romania) was affected by intense seismic activity, out of normal patterns. Considering this series of seismic events, in this paper we aimed at reevaluating the stability conditions of the slopes of the working fronts and of the internal dumps in the lignite open pits located in the region in this new context. Research focused on three lignite open pits, namely Peșteana North (Rovinari mining perimeter), Jilț North (Jilț mining perimeter), Berbești–Alunu (Berbești mining perimeter). After describing the general geology and tectonics of the areas under study, the seismic episode that affected the region at the beginning of 2023 (which in fact extended until November) is highlighted, with increased attention given to the earthquakes of 13 and 14 February 2023, with a local magnitude ML ≥ 5. The most important part of the study is represented by the stability analyses, carried out for normal conditions (considering the characteristics of the rocks at natural humidity and in the absence of the influence of external factors) and under seismic conditions, characterized by a peak ground acceleration equal to the maximum acceleration considered for the location area of the mining perimeters taken into study. The results of the study showed that, for most of the analyzed situations, a renewal of the technical exploitation documentation is required, which, taking into account the results of this study, must adopt new geometries of the excavation and deposition fronts, so that the objectives in terms of operational and workplace safety imposed by legislation are respected.

show abstract