Numerical investigation of stone columns as a method for improving the performance of rocking foundation systems

Liu, Weian; Hutchinson, Tara C.

doi:10.1016/j.soildyn.2017.10.015

Cited by 27 publications

(10 citation statements)

References 23 publications

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“…However, the vertical component of the earthquakes is not considered for the sake of simplicity, similar to many other researchers. 30,41,43,45 Response spectrum matching in accordance with the algorithms proposed by Al Atik and Abrahamson 63 was adopted to scale the ground motion excitations. The earthquake signals were scaled to match the target response spectrum between the periods ranging from T = 0.05 s to T = 4.0 s, with a maximum mismatch tolerance of 10%.…”

Section: F I G U R Ementioning

confidence: 99%

“…Numerous ground improvement techniques for the rocking shallow foundation have been investigated, such as the integration of micropiles, 40 stone columns, 41 large rigid foundation slabs, 42,43 and unconnected piles—both short 44 and long 45,46 —to reduce or even eliminate the issues associated with soil settlements and permanent foundation rotations. Despite achieving this goal, the absence of energy dissipation—which would otherwise arise from the inelastic behavior of the bridge pier and the soil medium—results in larger inertial forces to the pier as well as larger deck displacements 47,48,14 .…”

Section: Introductionmentioning

confidence: 99%

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Novel post‐tensioned rocking piles for enhancing the seismic resilience of bridges

El-Hawat

Fatahi

Taciroğlu

2021

Earthq Engng Struct Dyn

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The rocking pile foundation system is a relatively new design concept that can be implemented in bridges to improve their seismic performance. This type of foundation prevents plastic damage at the bridge piers and the foundation system, which are difficult to repair and can lead to collapse. However, lack of adequate energy dissipation in this type of foundation can result in large deck displacements and subsequent catastrophic failures of the bridge. The present study proposes a novel foundation system that integrates post-tensioned piles with the rocking foundation to simultaneously prevent plastic hinging at the piers and reduce the deck displacements during severe earthquakes. The effectiveness of the proposed foundation system is investigated and compared against the rocking pile and conventional fixed-base foundation systems using identical bridge configurations. Three-dimensional finite element models of these bridges were developed to capture possible nonlinear behavior of the bridge as well as soil-structure interaction effects. Six strong earthquakes with both horizontal components were selected and scaled to the appropriate seismic hazard level with a return period of 2475 years. Static pushover and nonlinear time-history analyses were then performed to compare the dynamic response of the bridges, including deck displacements, pier and pile inertial forces, and other nonlinear behavior experienced by the structure. The results reveal that by integrating the post-tensioned piles with the rocking foundation, the deck displacements were reduced to an acceptable limit without subjecting the bridge to any damage. In contrast, the bridge with the fixed base foundation experienced extensive damage at the piers, and the bridge with the rocking foundation experienced substantial deck displacements that ultimately led to unseating, resulting in the collapse of both bridges. It was therefore concluded that the proposed rocking foundation system with post-tensioned piles is the superior alternative and can be implemented in practice as an attractive solution due to the seismic protection it offers.

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Section: F I G U R Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel post‐tensioned rocking piles for enhancing the seismic resilience of bridges

El-Hawat

Fatahi

Taciroğlu

2021

Earthq Engng Struct Dyn

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“…Since the liquefaction hazards in the deeply deposited saturated liquefiable soil, in Aksu-kashgar highway in China, could not be resolved after the dynamic compaction of The load-bearing characteristics of the long-short piled raft foundation and the interaction mechanism between piles and soil were analyzed, and the results showed that antiliquefaction and control of settlement could be achieved with such piles (Chen et al [33]). Liu et al [34] studied, via numerical simulations, the response of a rocking foundation that was founded in a soft clayey environment and reinforced by stone columns, and they found that the length of the short pile in long-short gravel piles had little effect on the load bearing capacity of soft soil foundation. Meanwhile, Zhao et al [35] discussed the anti-liquefaction mechanism of long-short piles in the vibro-replacement stone column composite foundation and pointed out that there was no need for a large number of long gravel piles to reduce the excess pore water pressure in deep soil.…”

Section: Presentation Of a New Reinforcement Schemementioning

confidence: 99%

Study on Seismic Response in Deeply Deposited Saturated Liquefiable Soil Reinforced by Using Subarea Long-Short Gravel Piles

Junding

Zhang

et al. 2021

Applied Sciences

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To avoid large deformation, resulting from liquefaction, in inclined and deeply deposited liquefiable soil, it is necessary to design economical and reasonable reinforcement schemes. A reinforcement scheme employing subarea long-short gravel piles was proposed, and it was successfully applied in the embankment construction of the Aksu-kashgar highway. To reveal its underlying mechanism and effect on the seismic performance of the highway, the dynamic responses of natural foundation and two kinds of reinforced foundations were analyzed and compared under this scheme, using the program FEMEPDYN. Results showed that both the seismic subsidence and the excess pore pressure ratios were far less in the foundation reinforced with isometric gravel piles and in the foundation reinforced with subarea long-short gravel piles, compared with that in natural foundation. Therefore, the potential hazards of liquefaction were overcome in these two kinds of reinforced foundations. Furthermore, it was obvious that the shielding region only formed within the foundation reinforced with subarea long-short gravel piles. With the shielding effect, the proposed reinforcement scheme employing subarea long-short gravel piles not only eliminated liquefaction in deeply deposited liquefiable soil, but it also demonstrated an outstanding advantage in that the total length of gravel piles used was greatly reduced compared to the total length in the isometric gravel piles scheme and the interphase long-short gravel piles.

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“…The stress-strain relationship of encased stone columns was described as the superposition of a hyperbolic and linear model, which were used to simulate the behavior of an ordinary stone column under triaxial compression and uniaxial compression, respectively. Liu et al [10] studied the rocking response of a shallow foundation strengthened by stone columns in a soft clay environment by numerical simulation. Stone columns are often used to improve the bearing characteristics of soft soil foundations [11].…”

Section: Analysis Of Stone Column and Critical Sensor Technologymentioning

confidence: 99%

Developing an Intelligent Monitoring Technology for Airport Stone Column Machines

Tang

Yuan

et al. 2020

Sensors

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Most of the construction machinery for vibro-sinking stone columns, which are widely used in China, needs to be improved in terms of degree of automation. Engineering quality control is mainly carried out post-inspection; consequently, it is difficult to control the construction quality in real time. According to the construction characteristics of traditional stone column machines, we established the theory and model for the real-time monitoring of stone column construction, as well as put forward an intelligent monitoring method for stone column machines. With the comprehensive application of critical technologies such as the Global Navigation Satellite System (GNSS) measurement technology, laser ranging sensors, and massive data processing, an intelligent data acquisition technique and associated monitoring equipment for stone column construction machines are developed. The data acquisition and storage of crucial construction parameters, such as pile depth, pile point co-ordinates, bearing layer current, and reverse insertion times, are realized. A large number of actual construction data are collected and the construction quality parameters of stone column machines are obtained. By comparison with third-party detection data, it is verified that the intelligent monitoring technique for stone column machines proposed in this paper is feasible.

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Numerical investigation of stone columns as a method for improving the performance of rocking foundation systems

Cited by 27 publications

References 23 publications

Novel post‐tensioned rocking piles for enhancing the seismic resilience of bridges

Novel post‐tensioned rocking piles for enhancing the seismic resilience of bridges

Study on Seismic Response in Deeply Deposited Saturated Liquefiable Soil Reinforced by Using Subarea Long-Short Gravel Piles

Developing an Intelligent Monitoring Technology for Airport Stone Column Machines

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